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Research
(Published
online: 16-12-2014)
11.
Estimation of
genetic parameters of weekly test-day milk yields and first
lactation 305-day milk yield in Murrah buffaloes -
Saroj Kumar Sahoo, Avtar Singh, A. K. Gupta, A. K. Chakravarty,
Manvendra Singh and G. S. Ambhore
Veterinary World, 7(12): 1094-1098
doi:
10.14202/vetworld.2014.1094-1098
Saroj
Kumar Sahoo:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India;
sarojvet6804@gmail.com
Avtar
Singh:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India;
avtar54@gmail.com
A. K.
Gupta:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India;
guptaak2009@gmail.com
A. K.
Chakravarty:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India;
ak_chakravarty@yahoo.co.in
Manvendra Singh:
Dairy Cattle Breeding Division, National Dairy Research Institute,
Karnal, Haryana, India;
manav21vet@gmail.com
G. S.
Ambhore: Dairy Cattle Breeding Division, National Dairy
Research Institute, Karnal, Haryana, India;
drgsambhore@gmail.com
Received:
26-09-2014, Revised: 11-11-2014, Accepted: 17-11-2014, Published
online: 16-12-2014
Corresponding author:
Saroj Kumar Sahoo, email: sarojvet6804@gmail.com
Abstract
Aim:
The aim was to estimate genetic parameters of weekly test-day
(TD) milk yields and first lactation 305-day milk yield (FL305DY)
in Murrah buffaloes.
Materials and Methods: The data on 39059 weekly test-day milk
yield (WTDY) records during first lactation of 961 Murrah
buffaloes calved from 1977 to 2012 and sired by 101 bulls
maintained in an organized farm at National Dairy Research
Institute, Karnal was analyzed to study the effect of genetic and
non-genetic factors. Least squares maximum likelihood program was
used to estimate genetic and non-genetic parameters affecting WTDY
and FL305DY. Heritability was estimated using paternal half-sib
correlation method. The genetic and phenotypic correlations among
WTDY and 305- day milk yield was calculated from the analysis of
variance and covariance among sire groups.
Results: The least squares means for FL305DY was found to be
1853.49±15.88 Kg. The least squares means of overall WTDY ranged
from 2.44±0.07 kg (TD-43) to 7.95±0.06 kg (TD-8). Effect of
period, season and age at first calving groups was found to be
highly significant (p<0.01), significant (p<0.05) and
non-significant on FL305DY, respectively. The h2
estimate of FL305DY was 0.25±0.09. The estimates of phenotypic and
genetic correlations between 305-day milk yield and different WTDY
ranged from 0.52 to 0.84 and from 0.19 to 0.98, respectively.
Conclusions: Our study showed that the effect of period of
calving was highly significant (p<0.01) on FL305DY as well as all
the WTDY. The estimates of phenotypic and genetic correlations
were generally higher in the middle segment of lactation
suggesting that these TD yields could be used as the selection
criteria for early evaluation and selection of animals.
Keywords: genetic factors, Murrah buffalo, non-genetic
factors, test-day milk yields.
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