Author:
BABA M A,GANAI T A S,RATHER M A,HAMADANI A,SHANAZ S,ALAM SAFEER,KHAN NUSRAT N
Abstract
The aim of the present study was to estimate genetic, phenotypic and environmental trends for birth weight (BW), weaning weight (WW), six months body weight (W6), yearling body weight (W12) and age at first lambing (AFL). The genetic trends (gm), respectively, for BW, WW, W6 and W12 were 8, 44.22, 8.05 and 29.45 whereas for AFL it was –0.03 (day/year). The phenotypic trends (gm), respectively for BW, WW, W6 and W12 were –1.3, 36.06, –30.77 and 32.90 whereas for AFL it was 4.39 (day/year). The environmental trends (gm / year) respectively for BW, WW, W6, W12 were –9.3, –8.2, –38.83 and 3.45 whereas for AFL it was –4.36 (day/year). Positive and statistically significant genetic trends were recorded for all studied body weight traits whereas for AFL it was nonsignificant. Phenotypic trends for all the traits under study were statistically non-significant.
Publisher
Indian Council of Agricultural Research, Directorate of Knowledge Management in Agriculture
Subject
General Veterinary,Animal Science and Zoology
Reference11 articles.
1. Arora A L, Gowane G R, Prince L L L and Ved P. 2010. Genetic trends for performance traits of Malpura sheep. Indian Journal of Animal Sciences 80(9): 937–39
2. El-Wakil S I and Elsayed M. 2013. Genetic, phenotypic and environmental trends towards improving body weight in Barki sheep. Egyptian Journal of Sheep and Goat Sciences 2(8): 11–20.
3. Hamadani A, Ganai N A, Khan N N, Shanaz S and Ahmad T. 2019. Estimation of genetic, heritability, and phenotypic trends for weight and wool traits in Rambouillet sheep. Small Ruminant Research 177(2019): 133–40
4. Harville D A and Hendeason C R. 1966. Environmental and genetic trends in production and their effect on sire evaluation. Department of Animal Husbandry Cornell University, Ithaca, New York.
5. Henderson C R, 1975. Best linear unbiased estimation and prediction under a selection model. Biometrics 31: 423–47.