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R esearch
(Published online:
08-09-2015)
1.
Genetic analysis of reproductive performance of Frieswal cattle at
Military Farm, Ambala
-
Jagdeep Kumar, Y. P. Singh, Sushil Kumar, Rajbir Singh, Ravinder
Kumar and Pradeep Kumar
Veterinary World, 8(9): 1032-1037
doi:
10.14202/vetworld.2015.1032-1037
Jagdeep Kumar:
Department of Animal Husbandry, College of Veterinary and Animal
Sciences, Sardar Vallabhbhai Patel University of Agriculture &
Technology, Meerut, Uttar Pradesh, India;
jagdeepkumar.kumar11@gmail.com
Y. P. Singh:
Department of Animal Husbandry, College of Veterinary and Animal
Sciences, Sardar Vallabhbhai Patel University of Agriculture &
Technology, Meerut, Uttar Pradesh, India;
ypsingh@gmail.com
Sushil Kumar:
Dairy
Cattle Breeding Division, Central Institute for Research on
Cattle, Meerut, Uttar Pradesh, India;
chaturvedisk@gmail.com
Rajbir Singh:
Department of Animal Husbandry, College of Veterinary and Animal
Sciences, Sardar Vallabhbhai Patel University of Agriculture &
Technology, Meerut, Uttar Pradesh, India;
rajbirsinghsvbp@gmail.com
Ravinder Kumar:
Dairy Cattle Breeding Division,
Central Institute for Research on Cattle, Meerut, Uttar Pradesh,
India;
ravinder774@radiffemail.com
Pradeep Kumar: Department of Animal
Husbandry, College of Veterinary and Animal Sciences, Sardar
Vallabhbhai Patel University of Agriculture & Technology, Meerut,
Uttar Pradesh, India;
pradeepkumar1496@gmail.com
Received:
04-02-2015, Revised: 18-05-2015, Accepted: 25-05-2015, Published
online: 08-09-2015
Corresponding author:
Jagdeep Kumar, email: jagdeepkumar.kumar11@gmail.com
Citation:
Kumar
J, Singh YP, Kumar S, Singh R, Kumar R, Kumar P. Genetic analysis
of reproductive performance of Frieswal cattle at Military Farm,
Ambala, Veterinary World 8(8): 1032-1037.
Abstract
Aim: This study was carried
out to investigate the genetic analysis of reproductive
performance of Frieswal cattle at Military Farm, Ambala.
Materials and Methods: A total number of 3005 lactation
records of 1147 Frieswal cows over a period of 15 years extending
from 1993 to 2007 were used to study at Military Dairy Farm,
Ambala. The study period was divided into 5 period of 3 years
each. The average performances of reproduction traits, effect of
genetic and non-genetic factors were analyzed, and estimation of
genetic and phenotypic parameters of reproduction traits was
undertaken.
Results: The age at first calving (AFC) differed significantly
across the periods of calving. The AFC was lowest during the third
period (1999-2001) and longest in the first period (1993-95). The
effect of season and period of calving, lactation order and
regression of AFC on dry period, calving interval and service
period was highly significant. The effect of sire was
non-significant. The heritability estimates were low for almost
all the traits under study. The service period had a high genetic
correlation with dry period and calving interval. The dry period
also found to have a low genetic correlation with calving interval
in Frieswal cows. Service period had a high phenotypic correlation
with dry period and very high with a calving interval. The
phenotypic correlation between the dry period and calving interval
was recognized high.
Conclusions: Low heritability estimate for the reproduction
traits indicates that there is a very little additive genetic
variance in these traits, and individual selection will not be
helpful for improving them. Improvement may be brought through
better feeding and management of cows by reducing the
environmental variability.
Keywords: Frieswal cattle, non-genetics factors, age at first
calving, service period.
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