JournalTOCs

Scientific Journal of Crop Science
Number of Followers: 2

This is an Open Access Journal

Open Access journal
ISSN (Print) 2322-1690
Published by Sjournals

[11 journals]

Sex/age of kid/lamb and dam age/parity and managing dam nutrition as
determinants of mortality in small ruminants
- Authors: Never Assan
  Pages: 406 - 414
  Abstract: Mortality is one of the prime after effect on viability of commercial goat and sheep meat production efficiency, through its consequential compromised ewe/doe performance and economic losses in production. Several factors are potential determinants of kid/lamb mortality such as birth type, sex and age, birth weight, dam’s milk yield, parity order, dam age, dam weight and condition etc. However, the present review will focus on sex/age of kid/lamb, dam age and parity, and dam nutrition/season as determinants of kid/lamb mortality. Although results on the influence of sex on mortality has been inconsistent, several studies have reported a trend where mortality rates have been sex biased in goat and sheep. Male kids/lambs have lower survival rates and higher mortality hazard ratios as compared to female kids/lambs. Mortality is highest during the initial phase of kid/lamb life and have a propensity to decline as age progresses. Kids/lambs delivered to low parity order dams have low chances of survival due to poor maternal instinct. The advancement of maternal behavior gets better with parity order, as parity order progresses maternal instinct is consolidated. On the other hand, improvement in dam nutrition will enhance dam milking capacity which has been associated with high survivability of kids/lambs. This entails understanding of nutritional management of dams becomes an essential tool to curtail mortality in goats and sheep. Kidding/lambing season should coincide with seasonal availability of high quality forage to feed nursing dams hence high survivability of kids/lambs. The present discussion will give an insight on the influence of sex/age, dam parity and dam nutrition/season as determinants of mortality in goat and sheep meat production.
  PubDate: 2020-05-20
  Issue No: Vol. 9, No. 3 (2020)
New elite sugarcane varieties, 'Tafach Shenkora' and 'Kay
Shenkora', for commercial production in Ethiopia
- Authors: Esayas Tena, Firew Mekbib, Abebech Seife, Zinaw Dilnesaw, Feyissa Tadesse
  Pages: 415 - 424
  Abstract: 'Tafach Shenkora' and 'Kay Shenkora' sugarcane (Saccharum spp.) are the names assigned to sugarcane varieties with accession numbers Acc. 43 and Acc. 139, respectively. They were developed by Sugar Corporation, Research and Development and were registered and released in June 2019 by the National Variety Releasing Committee of Ethiopia to growers in three sugar estates in Ethiopia. 'Tafach Shenkora' and 'Kay Shenkora' were selected from local landraces collected during 2010/11 from different geographic regions across Ethiopia. The released varieties 'Tafach Shenkora' and 'Kay Shenkora' have high sugar yield (by 29.6% and 28.4%, respectively), early maturity and yield stability across locations compared to the standard check B52298. They also showed resistance to smut caused by Ustilago scitaminea. The average sugar yield for Tafach Shenkora and Kay Shenkora was 26.14 and 25.88 tons ha-1, respectively. These cultivars are the first of their kind to be released from sugarcane landraces collected in Ethiopia.
  PubDate: 2020-05-20
  Issue No: Vol. 9, No. 3 (2020)