5-Title: Effect of non-genetic factors on growth traits in a closed flock of Corriedale sheep in Kashmir
Authors: Nusrat N Khan, Nazir A Ganai, Syed Shanaz, Safeer Aalam, Shakeel Mir, Dibyendu Chakraborty, Zahoor Pampori, Ruksana Majid, Saba Bukhari, Mir Shabir, Tavsief Ahmad, Ambreen Hamadani and Mubashir Ali Rather
Source: Ruminant Science (2021)-10(1):25-28.
How to cite this manuscript: Khan Nusrat N, Ganai Nazir A, Shanaz Syed, Aalam Safeer, Mir Shakeel, Chakraborty Dibyendu, Pampori Zahoor, Majid Ruksana, Bukhari Saba, Shabir Mir, Ahmad Tavsief, Hamadani Ambreen and Rather Mubashir Ali (2021). Effect of non-genetic factors on growth traits in a closed flock of Corriedale sheep in Kashmir. Ruminant Science 10(1):25-28.
Abstract
The present study was carried out on 6874 birth records of Corriedale sheep maintained at the institute’s Mountain Research Centre for Sheep and Goat (MRCSG) over a 49-year period (1969-2017) using a mixed linear model with sire as a random effect and period, sex, and birth type as fixed effects. The overall least squares means were 3.66±0.03, 13.66±0.13, 18.99±0.17, 22.18±0.17 and 25.73±0.21 for birth weight (BW), weaning weight (WW), six months body weight (6MW), nine months body weight (9MW) and yearling body weight (12MW), respectively. The effect of period and sex was highly significant (p>0.01) on all growth traits under study. The sexual dimorphism (male to female) of 1.04, 1.01, 1.02, 1.06 and 1.05 for BW, WW, 6MW, 9MB and 12MW, respectively was observed in favour of males. All traits presented a decreasing trend over the periods.
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