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Estimates of genetic and phenotypic parameters considering first lactation and lifetime performance traits in Sahiwal and crossbred cattle

Indian Agricultural Research Journals

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Title Estimates of genetic and phenotypic parameters considering first lactation and lifetime performance traits in Sahiwal and crossbred cattle
 
Creator Dubey, P P
Singh, C V
 
Subject Cattle; First lactation traits; Genetic correlations; Heritability; Lifetime performance traits; Phenotypic correlation
 
Description The performance records of 587 Sahiwal and crossbred daughters of 47 sires maintained at dairy farm, of university during 1970-2001, were used to estimate heritability, genetic and phenotypic correlations between the first lactation and life time performance traits. Model used for estimation of sire variance and component of variance considering sire as a random effect, period and season of calving and genetic group as a fixed effects. The averages for age at first calving (AFC), first lactation milk yield (FLMY), first lactation period (FLP), tirst dry period (FDP), first service period (FSP) and first calving interval (FCI) were 1321.82±10.83 days; 2711.56±46.93 kg; 331,64±4.14 days; 165.49±5.64 days; 223±5.05 days; 494.45±6.12 days respectively. Herd life (HL), productive life (PL), total lactation length (TLL), life time milk yield (LTMY) and life time milk yield per day of productive life (LTMYIPL) were 1921.61±31.14 days; 1776.20±40.42 days, 1317.34±21.96 days; 11354.06±222.38 kg and 6.69±0.09 kg respectively. Heritability estimates for AFC, FLMY. FLP, FDP, FCI and FSP were 0.26±O.08, 0.69±0.12, 0.44±0.10, 0.35±0.09, 0.47±0.10 and 0.36±0.09 respectively. Heritability for lifetime performance traits were higher than heritability estimates of first lactation traits. AFC had negative genetic correlation with all other first lactation traits and values varied From low to medium. FLMY had positive genetic and phenotypic correlations with LTMY and LTMY/PL. These results suggested that selected on the basis of FLMY would be expected to improve life time performance traits.
 
Publisher Directorate of Knowledge Management in Agriculture
 
Date 2005-11-05
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/8246
 
Source The Indian Journal of Animal Sciences; Vol 75, No 11 (2005)
0367-8318
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/8246/3251
 
Rights Copyright (c) 2014 The Indian Journal of Animal Sciences