Open Access
Research
(Published
online:
08-02-2016)
4.
Genetic analysis of growth traits in
Harnali sheep -
Lalit, Z. S. Malik, D. S. Dalal, S. P. Dahiya, C. S. Patil and
Ravinder Dahiya
Veterinary World, 9(2): 128-132
doi:
10.14202/vetworld.2016.128-132
Lalit:
Department of Animal Genetics and Breeding, Lala Lajpat Rai
University of Veterinary and Animal Sciences, Hisar, Haryana,
India; drlalit78@gmail.com
Z. S. Malik:
Department of Animal Genetics and Breeding, Lala Lajpat Rai
University of Veterinary and Animal Sciences, Hisar, Haryana,
India; malikzile@yahoo.in
D. S. Dalal:
Department of Animal Genetics and Breeding, Lala Lajpat Rai
University of Veterinary and Animal Sciences, Hisar, Haryana,
India; drdsdalal@rediffmail.com
S. P. Dahiya:
Department of Animal Genetics and Breeding, Lala Lajpat Rai
University of Veterinary and Animal Sciences, Hisar, Haryana,
India; dahiyadahiya642000@yahoo.com
C. S. Patil:
Department of Animal Genetics and Breeding, Lala Lajpat Rai
University of Veterinary and Animal Sciences, Hisar, Haryana,
India; dr.cspatil03@gmail.com
Ravinder Dahiya:
Department of Animal Nutrition, Lala Lajpat Rai University of
Veterinary and Animal Sciences, Hisar, Haryana, India;
armaandahiya42@yahoo.com
Received: 02-07-2015, Revised: 15-12-2015, Accepted: 21-12-2015,
Published online: 08-02-2016
Corresponding author:
Lalit, e-mail: drlalit78@gmail.com
Citation:
Lalit, Malik ZS, Dalal DS, Dahiya SP, Patil CS, Dahiya R (2016)
Genetic analysis of growth traits in Harnali sheep,
Veterinary World 9(2):
128-132.
Abstract
Aim:
The present investigation was to study genetic characteristics
of Harnali sheep with respect to growth performance and to
estimate genetic parameters.
Materials and Methods:
The 22 years (1992-2013) data of growth traits of a 1603
synthetic population of Harnali sheep maintained at Lala Lajpat
Rai University of Veterinary and Animal Sciences, Hisar, was
utilized for this study. A mixed methodology with regression on
their dam’s weight was used to study the effect of non-genetic
factors on growth traits. Heritability, genetic and phenotypic
correlations were estimated using paternal half-sib analysis for
body weight at various ages and average daily gain (ADG) for
different growth periods.
Result:
The overall least squares mean of body weights recorded for
birth weight (BW), weaning weight (WW), six months body weight (SMW),
one yearling body weight (YBW), average daily gain from birth to
3 months (ADG1) and average daily gain from 3 to 12 months
(ADG2) were 3.35±0.05 kg, 12.41±0.08 kg, 16.30±0.12 kg,
21.88±0.08 kg, 100.66±0.86 g/day and 35.07±0.39 g/day,
respectively. The effects of year of birth significantly
(p<0.01) influenced the BW, WW, SMW, YWB, ADG1 and ADG2. The
effects of sex of lamb significantly (p<0.01) influenced the BW,
WW SMW, YWB, ADG1 and ADG2. The effects of dam’s weight at
lambing significantly (p<0.01) influenced BW, WW, SMW, YWB, ADG1
and ADG2. No definite trend was observed over the years for the
averages of body weight and gain. The heritability estimates of
BW, WW, SMW, YBW, ADG1 and ADG2 were 0.40±0.05, 0.38±0.05,
0.45±0.06, 0.29±0.05, 0.40±0.06 and 0.33±0.02, respectively. The
male lambs were significantly heavier than females at all stages
of growth. The heritability estimates were moderate for all the
growth traits and high genetic correlations of BW and WW with
SMW were found.
Conclusion:
Due to high heritability and positive correlations of SMW with
other body weights and daily gain, it was concluded that
selection on the basis of SMW would be the best approach to
improve growth performance in Harnali sheep.
Keywords:
correlations, growth traits, Harnali sheep, heritability.
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