Open Access
Research
(Published
online: 19-03-2016)
12.
Estimates of genetic parameters
for fat yield in Murrah buffaloes -
Manoj Kumar, Vikas Vohra, Poonam Ratwan, Jamuna Valsalan, C. S.
Patil
and A. K. Chakravarty
Veterinary World, 9(3): 295-298
doi:
10.14202/vetworld.2016.295-298
Manoj Kumar :
Division of Dairy
Cattle Breeding, ICAR-National Dairy Research Institute, Karnal
- 132 001, Haryana, India; drmanojneemwal@gmail.com
Vikas Vohra :
Department of
Animal Genetic Resources, ICAR-National Bureau of Animal Genetic
Resources, Karnal - 132 001, Haryana, India; vohravikas@gmail.com
Poonam Ratwan :
Division of Dairy
Cattle Breeding, ICAR-National Dairy Research Institute, Karnal
- 132 001, Haryana, India; punam.ratwan@gmail.com
Jamuna Valsalan:
Division of Dairy
Cattle Breeding, ICAR-National Dairy Research Institute, Karnal
- 132 001, Haryana, India; jamunavalsalan@gmail.com
C. S. Patil :
Department of
Animal Genetics and Breeding, Lala Lajpat Rai University of
Veterinary & Animal Sciences, Hisar, Haryana, India;
dr.cspatil03@gmail.com
A. K. Chakravarty :
Division of Dairy
Cattle Breeding, ICAR-National Dairy Research Institute, Karnal
- 132 001, Haryana, India; ak_chakravarty@yahoo.co.in
Received: 26-08-2015, Revised: 22-01-2016, Accepted: 03-02-2016,
Published online: 19-03-2016
Corresponding author:
Vikas Vohra, e-mail: vohravikas@gmail.com
Citation:
Kumar M, Vohra V, Ratwan P, Valsalan J, Patil CS, Chakravarty AK
(2016) Estimates of genetic parameters for fat yield in Murrah
buffaloes, Veterinary World, 9(3): 295-298.
Abstract
Aim:
The present
study was performed to investigate the effect of genetic and
non-genetic factors affecting milk fat yield and to estimate
genetic parameters of monthly test day fat yields (MTDFY) and
lactation 305-day fat yield (L305FY) in Murrah buffaloes.
Materials and
Methods:
The data on
total of 10381 MTDFY records comprising the first four
lactations of 470 Murrah buffaloes calved from 1993 to 2014 were
assessed. These buffaloes were sired by 75 bulls maintained in
an organized farm at ICAR-National Dairy Research Institute,
Karnal. Least squares maximum likelihood program was used to
estimate genetic and non-genetic parameters. Heritability
estimates were obtained using paternal half-sib correlation
method. Genetic and phenotypic correlations among MTDFY, and
305-day fat yield were calculated from the analysis of variance
and covariance matrix among sire groups.
Results:
The
overall least squares mean of L305FY was found to be 175.74±4.12
kg. The least squares mean of overall MTDFY ranged from
3.33±0.14 kg (TD-11) to 7.06±0.17 kg (TD-3). The h2
estimate of L305FY was found to be 0.33±0.16 in
this study. The estimates of phenotypic and genetic correlations
between 305-day fat yield and different MTDFY ranged from 0.32
to 0.48 and 0.51 to 0.99, respectively.
Conclusions:
In
this study, all the genetic and non-genetic factors except age
at the first calving group, significantly affected the traits
under study. The estimates of phenotypic and genetic
correlations of MTDFY with 305-day fat yield was generally
higher in the MTDFY-5 of lactation suggesting that this TD
yields could be used as the selection criteria for early
evaluation and selection of Murrah buffaloes.
Keywords:
genetic factors, Murrah buffalo, non-genetic factors, test-day
fat yields.
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