Survivability in Nilagiri and Nilagiri Synthetic Sheep: Genetic and Non-Genetic Effects

Arth B. Chaudhari, R. Rajendran, R. Venkataramanan, S. N. Sivaselvam


Data on 9333 records of Sheep Breeding Research Station, Sandynallah, The Nilagiris (Tamil Nadu)
available for 25 years (1989 to 2015) were analyzed for pre- and post-weaning survivability (0-
3 months, 3-6 months, 6-9 months and 9-12 months of age). The effect of various genetic and
non-genetic factors, viz., breed, contemporary group of birth, birth type, inbreeding, sex and birth
weight on survivability were analyzed. The least squares means for survivability during 0-3, 3-6,
6-9 and 9-12 months were 92.8 0.8, 95.3 0.8, 98.6 0.6 and 98.2 0.7 % for Nilagiri sheep
and 89.9 1.0, 92.9 1.0, 96.9 0.7 and 97.0 0.8 % for Nilagiri synthetic sheep, respectively.
Breed and contemporary group of birth had significant (P less than 0.01) effects on pre-weaning survivability.
Post-weaning survivability was significantly different in the two genetic groups. Contemporary groups
and sex of lamb had a significant effect on all the survivability traits, except that for the period from
9-12 months. Birth weight of lambs had a significant influence on early survivability traits of preweaning
and 3-6 months group.


Nilagiri, Nilagiri Synthetic, Sheep, Lamb survivability.

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