Open Access
Research
(Published
online: 16-03-2016)
9.
Genetic trend for growth and wool
performance in a closed flock of Bharat Merino sheep at sub
temperate region of Kodai hills, Tamil Nadu -
P. K. Mallick,
S. M. K. Thirumaran,
R. Pourouchottamane,
S. Rajapandi,
R. Venkataramanan,
G. Nagarajan,
G. Murali
and A. S. Rajendiran
Veterinary World, 9(3): 276-280
doi:
10.14202/vetworld.2016.276-280
P. K. Mallick :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; pkvetsrrc@gmail.com
S. M. K. Thirumaran :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; smktmaran@gmail.com
R. Pourouchottamane :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; drrpurush@gmail.com
S. Rajapandi :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; rajapandivet@yahoo.co.in
R. Venkataramanan :
Post Graduate
Research Institute in Animal Sciences, Kattupakkam, Kancheepuram,
Tamil Nadu, India; venkyvet@gmail.com
G. Nagarajan :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; gnagarajanars@gmail.com
G. Murali :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; muralipriya@gmail.com
A. S. Rajendiran :
Southern Regional
Research Centre, ICAR-Central Sheep and Wool Research Institute,
Mannavanur, Kodaikanal, Tamil Nadu, India; as.rajendiran@gmail.com
Received: 03-09-2015, Revised: 21-01-2016, Accepted: 31-01-2016,
Published online: 16-03-2016
Corresponding author:
Prasanta Kumar Mallick, e-mail: pkvetsrrc@gmail.com
Citation:
Mallick PK, Thirumaran SMK, Pourouchottamane R, Rajapandi S,
Venkataramanan R, Nagarajan G, Murali G, Rajendiran AS (2016)
Genetic trend for growth and wool performance in a closed flock
of Bharat Merino sheep at sub temperate region of Kodai hills,
Tamil Nadu, Veterinary World, 9(3): 276-280.
Abstract
Aim:
The study
was conducted at Southern Regional Research Center, ICAR-Central
Sheep and Wool Research Institute (CSWRI), Mannavanur,
Kodaikanal, Tamil Nadu to estimate genetic trends for birth
weight (BWT), weaning weight (3WT), 6 months weight (6WT), and
greasy fleece weight (GFY) in a Bharat Merino (BM) flock, where
selection was practiced for 6WT and GFY.
Materials and
Methods:
The data for
this study represents a total of 1652 BM lambs; progeny of 144
sires spread over 15 years starting from 2000 to 2014, obtained
from the BM flock of ICAR-SRRC (CSWRI), Mannavanur, Kodaikanal,
Tamil Nadu, India. The genetic trends were calculated by
regression of average predicted breeding values using software
WOMBAT for the traits BWT, 3WT, 6WT and GFY versus the animal’s
birth year.
Results:
The
least square means were 3.28±0.02 kg, 19.08±0.23 kg, 25.00±0.35
kg and 2.13±0.07 kg for BWT, 3WT, 6WT and GFY, respectively.
Genetic trends were positive and highly significant (p<0.01) for
BWT, while the values for 3WT, 6WT and GFY though positive, were
not significant. The estimates of genetic trends in BWT, 3WT,
6WT and GFY were 5 g, 0.8 g, 7 g and 0.3 g/year gain and the fit
of the regression shows 55%, 22%, 42% and 12% coefficient of
determination with the regressed value, respectively. In this
study, estimated mean predicted breeding value (kg) in BWT and
3WT, 6WT and GFY were 0.067, 0.008, 0.036 and −0.003,
respectively.
Conclusion:
Estimates of genetic trends indicated that there was a positive
genetic improvement in all studied traits and selection would be
effective for the improvement of body weight traits and GFY of
BM sheep.
Keywords:
Bharat Merino sheep, breeding value, genetic trend, regression.
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