Subjects -> AGRICULTURE (Total: 981 journals)
    - AGRICULTURAL ECONOMICS (93 journals)
    - AGRICULTURE (680 journals)
    - CROP PRODUCTION AND SOIL (120 journals)
    - DAIRYING AND DAIRY PRODUCTS (30 journals)
    - POULTRY AND LIVESTOCK (58 journals)

AGRICULTURE (680 journals)            First | 1 2 3 4     

Showing 201 - 263 of 263 Journals sorted alphabetically
Economic Affairs     Hybrid Journal   (Followers: 8)
Economic and Industrial Democracy     Hybrid Journal   (Followers: 12)
Economic Bulletin     Hybrid Journal   (Followers: 6)
Economic Policy     Hybrid Journal   (Followers: 51)
Economic Record     Hybrid Journal   (Followers: 7)
Economics of Disasters and Climate Change     Hybrid Journal   (Followers: 15)
Egyptian Journal of Biological Pest Control     Open Access  
Emirates Journal of Food and Agriculture     Open Access   (Followers: 1)
Empirical Economics     Hybrid Journal   (Followers: 16)
Encuentro     Open Access  
Energy Nexus     Open Access  
Ensaios e Ciência : Ciências Biológicas, Agrárias e da Saúde     Open Access  
Environment and Development Economics     Hybrid Journal   (Followers: 43)
Eppo Bulletin     Hybrid Journal   (Followers: 1)
Ethiopian Journal of Agricultural Sciences     Open Access  
Ethiopian Journal of Science and Technology     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access  
Ethology     Hybrid Journal   (Followers: 11)
EU Agrarian Law     Open Access   (Followers: 4)
Euphytica     Hybrid Journal   (Followers: 8)
Eurochoices     Hybrid Journal   (Followers: 1)
European Journal of Agronomy     Hybrid Journal   (Followers: 12)
European Journal of American Culture     Hybrid Journal  
European Journal of Health Economics     Hybrid Journal   (Followers: 24)
European Journal of Law and Economics     Hybrid Journal   (Followers: 50)
European Review of Agricultural Economics     Hybrid Journal   (Followers: 12)
EvoDevo     Open Access   (Followers: 4)
Farm Engineering and Automation Technology Journal     Open Access  
Fave : Sección ciencias agrarias     Open Access  
Fitosanidad     Open Access  
Florea : Jurnal Biologi dan Pembelajarannya     Open Access  
Folia Horticulturae     Open Access   (Followers: 1)
Folia Oecologica     Open Access  
Food and Agricultural Immunology     Open Access   (Followers: 2)
Food and Ecological Systems Modelling Journal     Open Access  
Food and Energy Security     Open Access   (Followers: 3)
Food and Environment Safety     Open Access   (Followers: 3)
Food Biotechnology     Hybrid Journal   (Followers: 8)
Food Economics - Acta Agriculturae Scandinavica, Section C     Hybrid Journal   (Followers: 1)
Food New Zealand     Full-text available via subscription   (Followers: 1)
Food Policy     Hybrid Journal   (Followers: 36)
Forest@ : Journal of Silviculture and Forest Ecology     Open Access  
Forestry Chronicle     Full-text available via subscription   (Followers: 9)
Fronteiras : Journal of Social, Technological and Environmental Science     Open Access  
Frontiers in Science     Open Access   (Followers: 1)
Fundamental and Applied Agriculture     Open Access  
Future Foods     Open Access   (Followers: 5)
Future of Food : Journal on Food, Agriculture and Society     Open Access   (Followers: 20)
Gema Agro     Open Access  
Geoderma     Hybrid Journal   (Followers: 8)
Ghana Journal of Agricultural Science     Full-text available via subscription   (Followers: 2)
Global Approaches to Extension Practice : A Journal of Agricultural Extension     Full-text available via subscription   (Followers: 1)
Global Economic Review     Hybrid Journal   (Followers: 8)
Global Journal of Agricultural Sciences     Full-text available via subscription  
Global Journal of Biology, Agriculture & Health Sciences     Open Access  
Gontor Agrotech Science Journal     Open Access  
Hacquetia     Open Access  
Health Economics, Policy and Law     Hybrid Journal   (Followers: 27)
Heliyon     Open Access  
Hereditas     Open Access   (Followers: 1)
Horticultural Studies     Full-text available via subscription  
Huria : Journal of the Open University of Tanzania     Full-text available via subscription   (Followers: 2)
IDESIA : Revista de Agricultura en Zonas Áridas     Open Access  
Indian Horticulture     Full-text available via subscription   (Followers: 9)
Indian Journal of Agricultural Sciences     Open Access   (Followers: 12)
Indian Journal of Animal Nutrition     Open Access   (Followers: 3)
Indian Journal of Extension Education     Open Access   (Followers: 4)
Indian Journal of Horticulture     Open Access   (Followers: 4)
Indian Journal of Traditional Knowledge (IJTK)     Open Access   (Followers: 1)
Indonesian Journal of Agricultural Science     Open Access   (Followers: 2)
Information Processing in Agriculture     Open Access  
Innovare Journal of Agricultural Science     Open Access   (Followers: 1)
Innovations in Agriculture     Open Access  
Interciencia     Open Access  
International Advances in Economic Research     Hybrid Journal   (Followers: 6)
International Dairy Journal     Hybrid Journal   (Followers: 4)
International Journal for Parasitology : Parasites and Wildlife     Open Access   (Followers: 2)
International Journal of Agricultural and Life Sciences     Open Access  
International Journal of Agricultural Extension     Open Access   (Followers: 1)
International Journal of Agricultural Management and Development     Open Access   (Followers: 2)
International Journal of Agricultural Research     Open Access   (Followers: 3)
International Journal of Agricultural Research, Innovation and Technology     Open Access   (Followers: 3)
International Journal of Agricultural Resources, Governance and Ecology     Hybrid Journal   (Followers: 2)
International Journal of Agricultural Science and Food Technology     Open Access  
International Journal of Agricultural Sustainability     Hybrid Journal   (Followers: 12)
International Journal of Agriculture and Forestry     Open Access   (Followers: 6)
International Journal of Agriculture Innovation, Technology and Globalisation     Hybrid Journal  
International Journal of Agriculture, Environment and Food Sciences     Open Access   (Followers: 1)
International Journal of Agriculture, Forestry and Life Sciences     Open Access  
International Journal of Agronomy     Open Access   (Followers: 5)
International Journal of Applied Agriculture and Apiculture Research     Open Access   (Followers: 3)
International Journal of Dairy Science     Open Access   (Followers: 4)
International Journal of Dairy Technology     Hybrid Journal   (Followers: 2)
International Journal of Food Science and Agriculture     Open Access   (Followers: 7)
International Journal of Fruit Science     Open Access  
International Journal of Green Economics     Hybrid Journal   (Followers: 6)
International Journal of Hydrology Science and Technology     Hybrid Journal   (Followers: 6)
International Journal of Intercultural Relations     Hybrid Journal   (Followers: 16)
International Journal of Pest Management     Hybrid Journal   (Followers: 2)
International Journal of Postharvest Technology and Innovation     Hybrid Journal   (Followers: 2)
International Journal of Poultry Science     Open Access   (Followers: 4)
International Journal of Recycling of Organic Waste in Agriculture     Open Access   (Followers: 1)
International Journal of Secondary Metabolite     Open Access  
International Journal of Social Economics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Agricultural Management and Informatics     Hybrid Journal   (Followers: 1)
International Journal of the Economics of Business     Hybrid Journal   (Followers: 1)
International Journal of Tropical Veterinary and Biomedical Research     Open Access  
International Journal of Vegetable Science     Hybrid Journal  
International Journal on Food, Agriculture and Natural Resources : IJ-FANRES     Open Access  
International Letters of Natural Sciences     Open Access  
International Multidisciplinary Research Journal     Open Access  
International Review of Applied Economics     Hybrid Journal   (Followers: 6)
International Review of Economics     Hybrid Journal   (Followers: 4)
International Scientific Journal of Engineering and Technology (ISJET)     Open Access  
Invertebrate Reproduction & Development     Hybrid Journal   (Followers: 5)
Iranian Journal of Applied Animal Science     Open Access   (Followers: 1)
Irrigation and Drainage     Hybrid Journal   (Followers: 12)
Irrigation Australia: The Official Journal of Irrigation Australia     Full-text available via subscription   (Followers: 1)
Italian Journal of Agronomy     Open Access   (Followers: 4)
Journal (Australian Native Plants Society. Canberra Region)     Full-text available via subscription  
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal für Kulturpflanzen     Open Access  
Journal of Advances in Agriculture     Open Access   (Followers: 5)
Journal of Agrarian Change     Hybrid Journal   (Followers: 3)
Journal of Agricultural & Food Information     Hybrid Journal   (Followers: 5)
Journal of Agricultural and Environmental Ethics     Hybrid Journal   (Followers: 8)
Journal of Agricultural and Food Chemistry     Hybrid Journal   (Followers: 9)
Journal of Agricultural and Marine Sciences     Open Access  
Journal of Agricultural Chemistry and Environment     Open Access   (Followers: 3)
Journal of Agricultural Economics     Hybrid Journal   (Followers: 31)
Journal of Agricultural Engineering     Open Access   (Followers: 2)
Journal of Agricultural Engineering     Full-text available via subscription   (Followers: 1)
Journal of Agricultural Extension     Open Access   (Followers: 1)
Journal of Agricultural Extension and Rural Development     Open Access   (Followers: 3)
Journal of Agricultural Meteorology     Open Access  
Journal of Agricultural Production     Open Access  
Journal of Agricultural Research and Development     Full-text available via subscription  
Journal of Agricultural Research and Extension     Open Access   (Followers: 1)
Journal of Agricultural Science     Full-text available via subscription   (Followers: 9)
Journal of Agricultural Science     Open Access   (Followers: 4)
Journal of Agricultural Sciences     Open Access   (Followers: 1)
Journal of Agricultural Sciences     Open Access  
Journal of Agricultural Studies     Open Access   (Followers: 1)
Journal of Agricultural, Biological & Environmental Statistics     Hybrid Journal   (Followers: 11)
Journal of Agriculture     Open Access  
Journal of Agriculture     Open Access  
Journal of Agriculture and Ecology Research International     Open Access  
Journal of Agriculture and Food Research     Open Access  
Journal of Agriculture and Food Sciences     Full-text available via subscription   (Followers: 1)
Journal of Agriculture and Natural Resources     Open Access  
Journal of Agriculture and Natural Resources Sciences     Open Access   (Followers: 3)
Journal of Agriculture and Rural Development in the Tropics and Subtropics     Open Access   (Followers: 4)
Journal of Agriculture and Social Research (JASR)     Open Access   (Followers: 5)
Journal of Agriculture and Sustainability     Open Access   (Followers: 6)
Journal of Agriculture, Food Systems, and Community Development     Open Access   (Followers: 3)
Journal of Agriculture, Forestry and the Social Sciences     Full-text available via subscription   (Followers: 5)
Journal Of Agrobiotechnology     Open Access  
Journal of Agromedicine     Hybrid Journal   (Followers: 1)
Journal of Agronomy     Open Access   (Followers: 7)
Journal of Anatolian Environmental and Animal Sciences     Open Access  
Journal of Animal Science and Products     Open Access   (Followers: 1)
Journal of Animal Science, Biology and Bioeconomy     Open Access  
Journal of Apicultural Science     Open Access   (Followers: 2)
Journal of Applied Communications     Open Access  
Journal of Applied Ecology     Hybrid Journal   (Followers: 211)
Journal of Arid Land     Hybrid Journal  
Journal of Asia-Pacific Entomology     Full-text available via subscription   (Followers: 6)
Journal of Biological Control     Hybrid Journal   (Followers: 2)
Journal of Biology, Agriculture and Healthcare     Open Access   (Followers: 2)
Journal of Biosystems Engineering     Full-text available via subscription  
Journal of Buffalo Science     Hybrid Journal  
Journal of Cereal Research     Open Access   (Followers: 3)
Journal of Cereal Science     Hybrid Journal   (Followers: 3)
Journal of Citrus Pathology     Open Access  
Journal of Competition Law and Economics     Hybrid Journal   (Followers: 34)
Journal of Cotton Research     Open Access  
Journal of Dairy Research     Full-text available via subscription   (Followers: 4)
Journal of Dairy Science     Open Access   (Followers: 12)
Journal of Degraded and Mining Lands Management     Open Access   (Followers: 1)
Journal of Economic Surveys     Hybrid Journal   (Followers: 23)
Journal of Environmental and Agricultural Studies     Open Access   (Followers: 1)
Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants, and Agricultural Wastes     Hybrid Journal   (Followers: 5)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Extension Education     Open Access   (Followers: 1)
Journal of Family and Economic Issues     Hybrid Journal   (Followers: 5)
Journal of Food Protection(R)     Full-text available via subscription   (Followers: 7)
Journal of Food Security     Open Access   (Followers: 2)
Journal of Food Security and Agriculture     Open Access   (Followers: 1)
Journal of Halal Product and Research     Open Access  
Journal of Horticultural Science and Biotechnology     Hybrid Journal   (Followers: 1)
Journal of Horticultural Sciences     Open Access   (Followers: 3)
Journal of Horticulture and Postharvest Research     Open Access  
Journal of Industrial Hemp     Hybrid Journal  
Journal of Integrative Agriculture     Full-text available via subscription   (Followers: 4)
Journal of Kerbala for Agricultural Sciences     Open Access  
Journal of Land and Rural Studies     Hybrid Journal   (Followers: 10)
Journal of Modern Agriculture     Open Access   (Followers: 4)
Journal of Natural Resources and Development     Open Access   (Followers: 2)
Journal of Natural Sciences Research     Open Access   (Followers: 1)
Journal of Nepal Agricultural Research Council     Open Access  

  First | 1 2 3 4     

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Journal of Animal Science and Products
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2667-4580 - ISSN (Online) 2667-4580
Published by DergiPark Homepage  [187 journals]
  • Mating Behavior and Hormone Profile in Melatonin Treatment for Goat Buck

    • Authors: Cemil TÖLÜ; Nazif YAZGAN, Hande Işıl AKBAĞ
      Abstract: In this study, the effects of melatonin implant treatment before the breeding season on melatonin (M) and testosterone (T) hormone levels, and the mating behavior and performance, were determined in Turkish Saanen goat bucks. Four head of bucks and 50 head of goats were used. The bucks were randomly divided into two groups and they were treated with 3 implants with 18 mg melatonin. The half of female goats were also implanted with melatonin (18 mg/goat). A total of 13 blood samples were collected before the melatonin implant (Day 0) and on the 21st, 42nd, 63rd, 94th, 129th, 157th, 185th, 213rd, 251st, 275th, 307th, and 335th days after the implant. Hormone analyses were performed using ELISA method and in animal species specific hormone kits. Mating was carried out for 10 minutes, and the mating behaviors of the bucks and does were recorded. While the treatment (MI) group had an overall means of melatonin hormone level of 526.3 ng/L, the control (C) group had a melatonin hormone level of 199.0 ng/L in overall (P=0.0224). The testosterone hormone level in the MI group was 12.7 nmol/L on average, and it was 6.13 nmol/L in the C group (P=0.2137). The MI group had significantly higher melatonin hormone levels in the summer, autumn, and spring than the C group, and significantly higher testosterone hormone levels in all seasons (P≤0.05). While M hormone had the highest level of MI and C groups in March, T hormone was highest of MI group in April and C group in March. Mating behaviors and the duration of mating were similar in the groups of bucks (P>0.05). A high statistically significant positive correlation coefficient (r=0.678) was determined between melatonin hormone and testosterone hormone (P<0.0001). In addition, there was a significant and positive correlation coefficient between hormone levels and the frequency of tongue-lapping (P=0.0134), sexual vocalization behavior (P=0.0199) in the MI group. In conclusion, the treatment of melatonin implants before the breeding season significantly increased the levels of M and T hormones and positive effects on frequency of mating behavior in Turkish Saanen goat bucks.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Evaluation of Employment Status of Graduates of Gevaş and Başkale
           Vocational Schools, Department of Plant and Animal Production

    • Authors: Hasan ÇELİKYÜREK; Cüneyt TEMÜR, Haydar BALCI, Mehmet Şerif SARIMURAT
      Abstract: In recent years, interest in agricultural vocational education has been decreasing in Turkey. Considering the strategic importance of agriculture and accordingly the food sector, this situation should be seen as an important problem. The employment status of students who graduated from Van Yüzüncü Yıl University, Gevaş and Başkale Vocational Schools, Department of Crop and Animal Production between 2005 and 2019 were investigated. In the study, employment status and working conditions of graduate students were evaluated according to the program they completed. Accordingly, 73.5% of the graduated students who participated in the survey stated that their goals and expectations after graduating from school were not realized. 53.9% of the graduates stated that the education they received made them love the profession. 45.1% of the graduated students stated that they work outside the sector, 34.3% do not work, 7.8% work in the field they graduated from, and 12.7% continue to study. Despite these, the rate of those who can recommend the program they have read to their circle is 58.8%, and the rate of those who will not is 41.2%. It has been determined that 2017-2019 graduates found a job in a shorter time (0-3 months) compared to other graduation years. However, a large part of this graduate group constitutes the majority of the group that has never worked for some reason. The goals and expectations of graduates aged 17-20 and 33-36 have changed after graduation, but graduates of the 21-24, 25-28 and 29-32 age group they mostly stated that their goals and expectations have not changed. They stated that the goals and expectations of graduates aged 37 and over have changed partially and that they mostly work in their own sector for 12 months or more. In terms of the graduated program, Organic Agriculture, Field Agriculture and Horticultural Agriculture program graduates mostly work outside the sector and they reported that they work for short periods of time and their monthly wages are low. On the other hand, they declared that they work in their own sector for long periods of time with high monthly wages. According to the results of the study, it is understood that the employment rate of the students in the program area they graduated from is very low and they do not meet the demands of the sector. Unfortunately, the mission gave to the graduates of vocational schools today cannot fully fulfill its function. As a result, students' interest in plant and animal production departments is decreasing day by day.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Fermentation and Digestibility Characteristics of Soybean, Sunflower and
           Their Mixture Silages

    • Authors: Cüneyt TEMÜR; Mehtap GÜNEY, Sibel ERDOĞAN, Murat DEMİREL
      Abstract: This experiment was conducted to determine the fermentation characteristics and in vivo digestibilities of silages prepared from soybean, sunflower and soybean-sunflower mixtures at different levels (15% soybean + 85% sunflower, 30% soybean + 70% sunflower, 45% soybean + 55% sunflower). For this purpose, a total of 25 silages, 5 for each mixture, were prepared in 120-liter drums. After 90 days of incubation, the content of crude materials, volatile fatty acids and fermentation characteristics of the silages were determined. To determine the digestive characteristics of the silages, 5 two-year-old Akkaraman rams with an average weight of 30-35 kg were used. The classical digestion method was used in the study. Dry matter (DM), organic matter (OM) and crude protein (CP) contents increased and ether extract (EE), acid and neutral detergent fiber (ADF and NDF) contents decreased with increasing soybean content in the mixtures. While the lowest pH, acetate, propionate and the highest Flieg values were determined in silages containing 30% soybean and 70% sunflower, the lowest butyrate value was determined in silages containing 15% soybean and 85% sunflower. The highest butyrate, lactate, EE, NDF and the lowest dry matter, CP contents were determined in sunflower silages. Digestibilities of DM, OM and CP were higher in soybean silages than others. While the highest EE digestibility was found in 30% soybean + 70% sunflower silage, the highest ADF content was found in 15% soybean + 85% sunflower silage and the lowest NDF content was found in sunflower silages. Consequently, sunflower and soybean silages and different mixture ratios did not lead to negative results and quality silages were obtained. According to fly evaluation, the best quality silages were obtained from a mixture of 30% soybean + 70% sunflower. Regarding digestibility, 100% soybean silage and 15% soybean silage + 85% sunflower silage had higher digestibility values than the others. It was concluded that these two silages can be recommended due to their higher digestibility.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Inhibition of Toxic Effects of Oxalate in Sugar Beet Pulp with Adding Ca
           During Ensiling

    • Authors: Cüneyt TEMÜR; Mehtap GÜNEY, Sibel ERDOĞAN, Murat DEMİREL
      Abstract: This study was carried out to eliminate the toxic effect of soluble oxalate in sugar beet pulp (SBP) by ensiling and adding Ca during ensiling and to determine the effects of the obtained silage on sheep. The study was based on two experiments. For the first experiment, the laboratory silages were prepared as SBP alone with the addition of molasses and straw at different levels of dry matter and Ca. After fermentation for 120 days, the Fleig scores, physical properties, Weende analysis, and oxalate analysis were performed. This laboratory trial showed that the content of the soluble oxalate could be reduced to nontoxic levels by ensiling and adding Ca. For the second experiment, SBP silage with 30% dry matter (DM) and 45 mg/kg SBP were prepared according to the results of the first experiment. This silage was fed to 36 sheep divided into six groups. During the experiment, blood samples and rumen fluid was collected every 14 days during the experiment, and the body weights were controlled. The results of this experiment showed that the soluble oxalate amount of SBP decreased to a tolerable level by the rumen. Thus, ensiling SBP with barley straw, molasses, urea, and di-calcium phosphate (DCP), as a calcium source, showed that soluble oxalate levels of SBP could be reduced levels below the toxic levels, and added to sheep ratio as 60%.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Comparison of Fattening Performance of Alpin x Damascus Goat F1 Crossbreed
           and Pure Damascus Goat Kids

    • Authors: Gizem MUTLUKOCA; Mahmut KESKİN
      Abstract: Alpine x Damascus goat crossbreeding was carried out in a private farm which breeds Damascus goats, in order to develop a goat genotype that will give more milk in the hot and humid climate of Çukurova in summer. This study was carried out with the aim of evaluating the fattening characteristics of the kids born with the crossbreeding, by comparing them with the Damascus kids. The animal material of the study consisted of 15 pure Damascus goats and Alpine x Damascus crossbred (F1) male kids. All kids that were reared under the same conditions during the suckling period and were weaned at 60 days of age were fed ad libitum after 10 days of familirization feeding. The fattening continued for 60 days and during this period, the kids were fed with kid fattening concentrate and alfalfa hay with a ratio of 5:1. Kids were weighed every 15 days. In the experimental period, daily live weight gain was determined as 201.7±10.16 g and 246.1±10.54 g, and daily average feed consumption was 1.56 kg and 1.57 kg for the crossbred and Damascus kids, respectively. As conclusion, it was determined that Damascus goats had better fattening performances than crosses.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Feed Usage and Cattle Feeding Practices in Cattle Enterprises in the
           Eastern Anatolia Region: Case of Central County of Erzincan Province

    • Authors: Serdar SAĞLICAK; Mete YANAR
      Abstract: This study was conducted to determine the common animal feeding practices as well as types of feeds used in the cattle enterprises located in the central county of Erzincan province. For this purpose, data were obtained by conducting a face to face survey with 401 dairy cattle breeders. Percentages of the enterprises which moved their animals to pasture in March, April, May and June were respectively 2.6%, 56.7%, 39.3% and 1.3%. Cattle breeders tended generally to buy concentrate feed from feed mills, while majority of them (74.8%) grew forage crops in their own enterprises. The most commonly used roughage types were wheat-barley straw (95.8%), alfalfa hay (78.1%) and meadow hay (52.1%), while crushed barley (92.0%), wheat bran (78.6%), dairy cattle feed (68.3%) and cattle fattening feed (50.6%) were prominent as concentrate feeds. It was also determined that feeds in the majority of the enterprises (97.5%) were distributed to animals by hand. Data regarding weaning age of calves indicated that 0.6% of the enterprises weaned their calves at one month of age, 10.9% at two months of age, 79.7% at three-four months of ages, 5.4% at five-six months of ages and 3.4% at seven months of age or older. In conclusion, the awareness of the breeders about updated cattle feeding practices and especially for silage corn planting as well as usage of maize silage for nutrition of animals must be increased and the incentives and financial supports in this respect has to be raised for profitable cattle husbandry in central county.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Deep Learning Algorithms for Complex Traits Genomic Prediction

    • Authors: Hayrettin OKUT
      Abstract: The underlying perception of genomic selection (GS) is to use genome-wide from DNA sequence (“SNP markers”) along with phenotypes from an observed population to make prediction for the phenotypic outcomes of untested individuals in crop and livestock breeding programs. GS was firstly described by Meuwissen et al.(2001) in dairy cattle to identify genetically superior animals at an early age. The aim was to capture specific genes across the whole genome that are associated with desired traits. The major challenge in using GS programs is to predict the effect of many SNP markers using phenotypic information from a few individuals (aka small n big p problem, or p >> n). Many approaches including naïve and scaled elastic net, ridge regression BLUP Bayesian approaches (BayesA, BayesB, BayesCπ, BayesDπ) LASSO, Support Vector Regression have been conducted to address the small n big p (aka, p >> n) problem. These methods all perform well for (p>>n) by using linear approximation to set a functional relationship between genotypes and phenotypes. However, these methods may not fully capture non-linear effects which are possible to be crucial for complex traits. To deal with this limitation, many methods including neural networks (NN) were recommended to cover non-linearity for GS. Artificial NNs (ANNs) for GS was first presented by Okut et al. (2011) who establish a fully connected regularized multi-layer ANN (MLANN) comprising one hidden layer to predict the body mass index (BMI) in mice using dense molecular markers. Since then, rather complex ANNs approaches have been applied including deep learning (DL) networks. The different DL algorithms have their own advantages to deal with specific problems in complex trait GS. Four different major classes of DL approaches such as fully connected deep learning artificial neural networks (DL-MLANN), recurrent neural networks (RNN), convolutional neural networks (CNN) and long-short term memory (LSTM) and some variation of these network architectures will be summarized here.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Economic Weights in the Estimation of Breeding Values in Dairy Goat
           Breeding

    • Authors: Ercan ŞEN; Türker SAVAŞ
      Abstract: It is important to accurately estimate the genetic values of animals in terms of features of economic importance in animal breeding. In this review, the theoretical background of the economic coefficients used in the formation of the breeding value is given and the method used in the formation of these coefficients is exemplified specifically for dairy goats. According to the selection index theory, all traits are considered in the ratio of their "economic weight" in the estimation of the cumulative breeding value. An economic coefficient (weight) is needed for each of the phenotypes. To find the economic coefficients, the economic values must be calculated. Economic value (ED) expresses the profit of one unit increase per animal in a trait, with other traits remaining constant. The "averages" specific to the production system in which the breeding program will be applied, are very important in terms of the accuracy of the estimation of the economic values, in determining the biological parameters that will form the basis of the bioeconomic equations. Considering that the results of the breeding programs will be seen in the future, it will be more accurate to use these predictions in determining the economic values of the traits by estimating the future states of the economic parameters with appropriate statistical methods. There is little literature on economic values for dairy goat production systems. Increasing studies on the subject will enable more effective planning of breeding programs.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • No title

    • Authors: Ömer AKBULUT
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
  • Investigation of Some Reproductive Traits of Awassi and Romanov x Awassi
           Ewes and Survival Ability and Growth Characteristics of Their Lambs

    • Authors: Doğan TÜRKYILMAZ; Selçuk ÖZYÜREK, Ülkü DAĞDELEN, Nurinisa ESENBUĞA, Mustafa YAPRAK
      Abstract: This study was carried out to compare some reproduction characteristics of Awassi and Romanov x Awassi (ROxIV) (F1) crossbred sheep and to evaluate the survival ability and growth characteristics of their lambs. Animal materials consist of 30 Awassi, 37 ROxIV ewes and 79 lambs which were parturient from those ewes. Lambing rate, twin rate and the number of litter size were determined 83%, 4% and 1.04 in Awassi, and 91.9%, 55.9% and 1.56 in ROxIV ewes respectively. The survival rates of lambs up to weaning, 120th day and end of the pasture were 96.2%, 84.6% and 80.8% in Awassi, and 81.1%, 71.7% and 60.4% in ROxIV lambs. While the birth rates of ROxIV sheep are significantly higher than those of Awassi sheep, it is observed that Awassi lambs perform better than the ROxIV lambs in terms of their survival rates, and the death rate in ROxIV lambs reaches 39.6% at the end of pasture. Average birth weight, weaning weights and post grazing weights of lambs were determined 3.87, 15.56 and 24.95 kg in Awassi lambs; 3.23, 12.77 and 19.89 kg in ROxIV lambs. The effect of genotype, ewe age and birth type significantly affected the birth weight, weaning weight, and end of pasture weight. As a result, ROxIV crossbreeding improves fertility, but the survivability at various ages of the lambs is very low compared to Awassi lambs.
      PubDate: Mon, 27 Dec 2021 00:00:00 +030
       
 
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