Indian Journal of Animal Research

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Research Article

Indian Journal of Animal Research, volume 51 issue 4 (august 2017) : 635-639

Effect of genetic and non-genetic factors on age at first calving in Sahiwal cattle

Jitendra Singh, V. K. Singh, Alok Kumar Yadav, Amit Kumar Jha
1<p>Department of Animal Genetics and Breeding, C.V. Sc. &amp; A. H.,&nbsp;N.D.U.A. &amp; T. Kumarganj, Faizabad-224 229, India</p>
Cite article:- Singh Jitendra, Singh K. V., Yadav Kumar Alok, Jha Kumar Amit (2016). Effect of genetic and non-genetic factors on age at first calving in Sahiwal cattle . Indian Journal of Animal Research. 51(4): 635-639. doi: 10.18805/ijar.8425.

ABSTRACT

The present study was conducted on Sahiwal cows maintained at Uttar Pradesh Livestock- cum- Agriculture Farm, Chak Ganjaria, Lucknow. A total of 1194 records on age at first calving (AFC) spanning over a period of 57 years (1949 to 2006) were subjected to least squares analysis using suitable statistical model considering sire as random while period and season as fixed effects. The least squares mean of AFC was estimated to be 1251.77± 22.15 days. The least squares analysis revealed significant effect (P £ 0.01) of sire and period. However, the effect of season was found to be non-significant. The heritability estimate of age at first calving was found to be 0.159.  The genetic, phenotypic and environmental trend for AFC were -3.31, 32.78 and 36.09 respectively. It was concluded from the present findings that selection of sire may be practiced for genetic improvement of this trait and ameliorative managemental practices should be employed to improve upon the trait i.e. age at first calving. 

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