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  Subjects -> ANIMAL WELFARE (Total: 107 journals)
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Revista Colombiana de Ciencias Pecuarias (Colombian journal of animal science and veterinary medicine)
Journal Prestige (SJR): 0.192
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0120-0690 - ISSN (Online) 2256-2958
Published by Universidad de Antioquia Homepage  [10 journals]
  • Bayesian threshold analysis of litter size in sheep

    • Authors: Amin Mortazavi; Sadegh Alijani, Mostafa Ghaderi-Zefrehei, Farjad Rafeie, Ali Jafari, Hamed Amirpour-Najafabadi
      Abstract: Background: Litter size at birth (LSB) is one of the most important economic traits in sheep and could be used in genetic improvement schemes for meat production. LSB is inherently a categorical trait and should be analysed with threshold models. Objective: Bayesian threshold models were used to analyze sheep LSB to estimate genetic parameters. Methods: Data was based on 7,901 LSB records from 14,968 dams and 682 sires collected from 1986 to 2012 at Makouie Sheep Breeding Station in Iran. Means of posterior distributions (MPDs) of LSB's genetic parameters were estimated, and the best-fitted models were selected using the deviance information criterion. Results: In the repeated measurement analysis, the estimated direct and maternal heritabilities, and permanent environmental effect (±SE), according to the best-fitted model (model 5), were 0.01 (0.010), 0.02 (0.014), and 0.01 (0.011), respectively. In the univariate analysis, the best estimates of direct and maternal heritabilities were 0.12 (0.064) and 0.08 (0.045), respectively. An increasing trend for direct and maternal heritabilities was observed in parity 2 (0.15 (0.082) and 0.25 (0.083), respectively). In the bivariate analysis, the best estimates of direct and maternal heritabilities for LSB were 0.03 (0.027) and 0.22 (0.041), respectively. The direct and maternal genetic correlations among parities were 0.25 (0.054) and 0.12 (0.021), respectively. Conclusions: The results showed a considerable influence of environmental factors on LSB in each parity of sheep; also, statistically different genetic parameters (p<0.05) were obtained from one parity to another, indicating the different and large influences of genetic and environmental factors for each parity.
      PubDate: Mon, 11 Jul 2022 00:00:00 -050
       
  • Use of oral fluids for efficient monitoring of influenza viruses in swine
           herds in Colombia

    • Authors: Karl A Ciuoderis; Laura S Perez, Andrés Cardona, Juan Pablo Hernandez-Ortíz, Jorge E Osorio
      PubDate: Mon, 11 Jul 2022 00:00:00 -050
       
  • Effect of varying dietary crude protein and metabolizable energy levels on
           leg abnormalities and performance in broiler chickens

    • Authors: Leodan T Rodríguez-Ortega; Alejandro Rodríguez-Ortega, Fredy Mera-Zuñiga, Arturo Pro-Martínez, Filogonio J Hernández-Guzmán, Eliseo Sosa-Montes, Fernando González-Cerón, Hector Leyva-Jimenez
      Abstract: Background: Nutrient restriction is a common strategy to prevent metabolic disorders in fast growing broiler chickens, but limited information is available regarding the impact of diets with low protein and energy on leg abnormalities. Objective: Two experiments were conducted to evaluate the effect of varying crude protein (CP) and metabolizable energy (ME) levels on gastrocnemius tendon (GTeBS) and tibia breaking strength (TiBS), gait score (GS) and valgus/varus angulation (VAng). Methods: In Experiment 1, eight-d-old Ross 308 broilers (n=90) were randomly assigned into three treatments: 13/2,900 (13% CP and 2,900 kcal ME kg-1 of diet), 17/3,000 (17% CP and 3,000 kcal ME kg-1 of diet), and 21/3,025 or control (21% CP and 3,025 kcal ME kg-1 of diet). In Experiment 2, six-d-old Ross 308 chickens (n=192) were randomly distributed into two treatments: 16/3,000; 16% CP and 3,000 kcal ME kg-1 of diet and 21/3,000 or control; 21% CP and 3,000 kcal ME kg-1 of diet. In both experiments data were analyzed as one-way ANOVA. Results: In Experiment 1, broilers in the 17/3,000 and control treatments had similar (p>0.05) GTeBS (202 and 224 N, respectively), and TiBS (338 and 332 N, respectively). Birds in the 13/2,900 treatment showed higher GS (lower walking ability; 80% of birds with score >3), and greater VAng (53% of birds with score >2) than broilers in the control treatment (0% of birds with GS score >3 and 0% of birds with VAng score >2). Experiment 2, broilers in the 16/3,000 showed similar VAng, GS and TiBS than birds in the control treatment. However, birds in the 16/3,000 treatment showed lower (-26%) GTeBS than birds in the control treatment (p<0.05). Conclusions: Feeding broilers with 16% CP and 3,000 kcal ME kg-1 of diet did not affect tibia breaking strength, gait score and valgus/varus angulation. A diet containing 16% CP or less and 2,900-3,000 kcal ME kg-1 reduces tendon and tibia breaking strength.
      PubDate: Mon, 11 Jul 2022 00:00:00 -050
       
  • Presence of Chlamydia abortus in colostrum, milk and vaginal discharge
           samples of sheep

    • Authors: María Guadalupe Martínez-Serrano; Efrén Díaz-Aparicio, Gabriela Palomares-Reséndiz, Jorge Luis Tórtora-Pérez, Hugo Ramírez-Álvarez, Nieves Ortega-Hernández, Jesús Salinas-Lorente, José Francisco Morales-Alvarez, Juan Julio César Cervantes-Morali
      Abstract: Background: The main transmission route of Chlamydia abortus is by ingesting the microorganism that has been eliminated in vaginal secretions, placental membranes or abortions that contaminate the environment and, possibly, through milk and colostrum. Elimination through vaginal secretions is well documented. However, there are no reports about isolation and identification of C. abortus in the colostrum or milk of infected sheep, so it is important to determine whether or not C. abortus may be present in these secretions, which are the only food of lambs. Objective: To detect C. abortus in colostrum, milk, and vaginal secretions of sheep with a history of reproductive disorders. Methods: Colostrum, milk, and vaginal exudates were collected from 66 sheep. The samples were inoculated in mouse fibroblast cell cultures and the presence of C. abortus determined by direct immunofluorescence. Results: 19 out of 66 colostrum samples (28.7%), 14 out of 66 milk samples (21.2%) and 17 out of 66 vaginal swabs (25.7%) were positive for C. abortus. The 50 samples positive for isolation and detected by immunofluorescence, together with 42 negative samples were subjected to qPCR to amplify a fragment of the ompA gene from C. abortus. Thirty-eight of the 92 samples processed by this technique were positive for C. abortus. Conclusion: The results demonstrated the presence of C. abortus in a high proportion in colostrum, milk and vaginal secretions of infected sheep. To the best of our knowledge, this is the first field study confirming the presence of C. abortus in colostrum, which shows that excretion of Chlamydia by lactogenesis could occur in the first hours after birth.
      PubDate: Mon, 11 Jul 2022 00:00:00 -050
       
  • Performance of Holstein-Friesian calves drinking desalinated water in the
           preweaning period

    • Authors: Joel Ventura-Ríos; David Domínguez-Díaz, Alejandro Lara-Bueno, Guillermo Villalobos-Villalobos, Rufino López-Ordaz, José Jaimes-Jaimes, Agustín Ruíz-Flores
      Abstract: Background: High salinity of drinking water can adversely affect health and productive performance of calves during artificial rearing. Objective: To evaluate the effect of drinking water total dissolved salts (TDS) content on productive performance of Holstein-Friesian calves during artificial rearing. Methods: Twenty-nine newborn Holstein-Friesian calves weighing 39±0.94 kg at birth were randomly assigned to two treatment groups for 56 d. Treatment 1 (n=14) consisted of drinking water with 1,469±75 mg L-1 TDS, while treatment 2 (n=15) used drinking water from the same source but filtered by reverse osmosis to contain 107±31 mg L-1 TDS. Results: Water intake was numerically affected by TDS concentration, increasing 13% (p>0.08) when drinking low-TDS water (3,554 versus 3,088 ml d-1). Feed intake (dry basis) decreased 26% (500 versus 676 g d-1; p<0.05), and average daily weight gain increased 29% (434 versus 335 g d-1; p<0.05) for calves drinking low-TDS water. Treatment 2 resulted in 10% higher body weight compared to treatment 1 (64.3 versus 58.6 kg; p<0.01). Digestibility of dry matter and protein was not affected (p>0.05) by TDS content in the drinking water. Conclusion: Desalinated water improves productive performance of Holstein-Friesian calves during artificial rearing.
      PubDate: Mon, 11 Jul 2022 00:00:00 -050
       
 
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