Open Access
Research
(Published
online: 06-04-2016)
3.
Genetic and environmental causes of
variation in gestation length of Jersey crossbred cattle -
Anshuman Kumar, Ajoy Mandal, A. K. Gupta and Poonam Ratwan
Veterinary World, 9(4): 351-355
doi:
10.14202/vetworld.2016.351-355
Anshuman Kumar:
Dairy Cattle Breeding Division, ICAR-National Dairy Research
Institute, Karnal, Haryana, India; anshuman.nanhe@gmail.com
Ajoy Mandal:
Animal Breeding Section, Eastern Regional Station, ICAR-National
Dairy Research Institute, Kalyani, West Bengal, India;
ajoymandal@rediffmail.com
A. K. Gupta:
Dairy Cattle Breeding Division, ICAR-National Dairy Research
Institute, Karnal, Haryana, India; guptaak2009@gmail.com
Poonam Ratwan:
Dairy Cattle Breeding Division, ICAR-National Dairy Research
Institute, Karnal, Haryana, India; punam.ratwan@gmail.com
Received: 16-11-2015, Revised: 26-02-2016, Accepted: 04-03-2016,
Published online: 06-04-2016
Corresponding author:
Anshuman Kumar, e-mail: anshuman.nanhe@gmail.com
Citation:
Kumar A, Mandal A, Gupta AK, Ratwan P (2016) Genetic and
environmental causes of variation in gestation length of Jersey
crossbred cattle,
Veterinary World, 9(4):
351-355.
Abstract
Aim:
The objective of this study was to investigate the effect of
genetic and non-genetic factors and estimate the genetic
parameter for gestation length (GL) of Jersey crossbred cattle.
Materials and Methods:
The data included the 986 parturition records on Jersey
crossbred cattle maintained at the Eastern Regional Station of
ICAR-National Dairy Research Institute, Kalyani, West Bengal,
India during 36 years (1978-2013). The data were analyzed
applying mixed model least square technique considering the
fixed effects of genetic group, season of calving, period of
calving, parity of animal, birth weight, and sex of calf born
from animal. The effect of sire was included as a random effect
in the model.
Results:
The genetic group of animal, season of calving, parity of
animal, and birth weight of calf born were found to be a
significant source of variation in the GL, whereas the period of
calving and sex of calf did not affect this trait. Cows with
<50% and >62.5% Jersey inheritance had the shortest and longest
GLs, respectively. Cows calved in summer and rainy season had
shorter GL than those calved in the winter season. Older cows in
4th parity carried calves for longer days than the cows in 1st
parity. The increase in calf birth weight significantly (p<0.01)
contributed to a linear increase in GL value in this study. The
heritability estimate of GL was 0.24±0.08.
Conclusion:
It can be concluded that selection for lower GL without
distressing future growth of calf can be used to reduce calving
difficulty, but a very small standard deviation of GL limits the
benefit. Moreover, more accurate prediction of calving date will
help in better management and health care of pregnant animals.
Keywords:
crossbred cattle, genetic and environmental factors, gestation
length, heritability.
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