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R esearch
(Published online:
29-07-2015)
20.
Identifying factors affecting age at first
semen freezing and age at first semen use in Sahiwal bulls
- B. C. Naha, A. K. Chakravarty, M. A. Mir, V. Jamuna, A. P.
Singh and D. Maher
Veterinary World, 8(7): 928-931
doi:
10.14202/vetworld.2015.928-931
B. C.
Naha:
Division of Animal Genetics, Indian Council of Agricultural
Research, Indian Veterinary Research Institute, Izatnagar,
Bareilly, Uttar Pradesh, India;
binoychandranaha@gmail.com
A. K.
Chakravarty:
Dairy Cattle Breeding Division, Indian Council of Agricultural
Research, National Dairy Research Institute, Karnal, Haryana,
India;
ak_chakravarty@yahoo.co.in
M. A.
Mir:
Dairy Cattle Breeding Division, Indian Council of Agricultural
Research, National Dairy Research Institute, Karnal, Haryana,
India;
mohsinvet546@gmail.com
V.
Jamuna:
Dairy Cattle Breeding Division, Indian Council of Agricultural
Research, National Dairy Research Institute, Karnal, Haryana,
India;
jamunavalsalan@gmail.com
A. P.
Singh:
Dairy Cattle Breeding Division, Indian Council of Agricultural
Research, National Dairy Research Institute, Karnal, Haryana,
India;
drapsndri@gmail.com
D.
Maher: Dairy Cattle Breeding Division, Indian Council of
Agricultural Research, National Dairy Research Institute, Karnal,
Haryana, India;
dinesh.maher@gmail.com
Received:
14-02-2015, Revised: 24-06-2015, Accepted: 30-06-2015, Published
online: 29-07-2015
Corresponding author:
M. A. Mir, e-mail: mohsinvet546@gmail.com
Citation:
Naha BC, Chakravarty
AK, Mir MA, Jamuna V, Singh AP, Maher D (2015) Identifying factors
affecting age at first semen freezing and age at first semen use
in Sahiwal bulls, Veterinary World 8(7):928-931.
Abstract
Aim:
The objective of the study was
to evaluate the effects of non-genetic factors on reproduction
traits viz.
age at first semen freezing and age at first semen use of breeding
bulls in Sahiwal bulls by fitting least-squares analysis.
Materials and Methods:
The information on reproduction traits of
43 Sahiwal breeding bulls belonging to 8 sets of Sahiwal breeding
program at Indian Council of Agricultural Research-National Dairy
Research Institute (ICAR-NDRI), Karnal (Haryana), India during 27
years (1987-2013) were analyzed using fixed linear model. The
information was collected from AI records, reproduction sheets,
and bull AI register maintained at different sections of Institute
viz.
record room of Dairy Cattle Breeding Division (DCB), Cattle Yard,
Artificial Breeding Research Centre, ICAR-NDRI, Karnal.
Results: The
average age at first semen freezing and age at first semen use of
Sahiwal breeding bulls was estimated as 3.17±0.01 years and
5.35±0.01 years, with the coefficient of variation 18.93% and 20%,
respectively. The overall least squares mean for age at first
semen freezing and age at first semen use was estimated as
3.14±0.09 years and 5.25±0.02 years, respectively, in Sahiwal
breeding bulls. Period of freezing/use had significant effects on
reproductive traits (p<0.01). Season had no significant effect on
any of the traits considered in this study.
Conclusion: It can be
concluded that management inputs such as nutrition, breeding, and
optimum environment should be taken care of to optimize age at
first semen freezing and age at first semen use for better
utilization of superior germplasm.
Keywords:
age at first semen freezing, age at first semen use, non-genetic
factors, Sahiwal breeding bull.
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