Indian Journal of Animal Research

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Indian Journal of Animal Research, volume 42 issue 4 (december 2008) : 261-263

GENETIC STUDIES ON FIRST LACTATION AND LIFETIME TRAITS IN HOLSTEIN FRIESIAN CROSSBRED COWS*

A.S. Kharat1, S.V. Kuralkar, , S.Z. Ali
1Department of Animal Genetics and Breeding, Post Graduate Institute of Veterinary and Animal Sciences (MAFSU), Akola-444 104, India
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Cite article:- Kharat1 A.S., Kuralkar S.V., Ali S.Z. (2024). GENETIC STUDIES ON FIRST LACTATION AND LIFETIME TRAITS IN HOLSTEIN FRIESIAN CROSSBRED COWS*. Indian Journal of Animal Research. 42(4): 261-263. doi: .
Data of 432 lactation records of 96 crossbreds cows sired by 5 bulls extending over a
period 1980-1997 from Cattle Breeding Farm, Borgaon Manju, Akola (M. S.) were collected.
The first lactation traits are first lactation milk yield (FLMY) and first lactation length (FLL)
while lifetime traits are lifetime milk yield (LTMY) and productive life (PL). The model for
least square analysis of variance included random effect of sire and fixed effect of period and
season of calving was applied for analysis of data. Overall mean for FLMY, FLL, LTMY and
PL were 832.80 + 40.34 kg, 258.82 + 8.35 days, 4865.23 + 438.79 kg and 1200.37 + 91.86
days respectively. All the first lactation and lifetime traits were nonsignificantly influenced by
sire, period and season of calving. The heritability estimates are calculated by half
sib correlation method and it was found as 0.40 + 0.38 and 0.35 + 0.36 for FLMY and
FLL, respectively.
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