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Influence of Genetic and Non-Genetic Factors on Shrinkage Percentage of Wool in Indigenous and Crossbred Sheep

Thiagarajan Ramasamy Jayashankar M. R.
Vol 2(3), 112-115

A study was conducted to determine the effect of breed group, age, period of birth, season of shearing and sex on shrinkage percentage. Wool samples were collected from Bannur (n=68) and UAS-improved strain (n=120) maintained at UAS campus, Bangalore. Wool samples(n =608) were also collected from Bannur(n=69), Rambouillet X Deccani (n=56), Corriedale X Bannur(n=76), Corriedale X Deccani (n= 122) and Deccani(n=97) before shearing at the left side region at Large Scale Sheep Breeding and Training Centre, Kudapura, Chellakere of Chiradurga district of Karnataka. The Least squares analysis of variance technique was adapted to detect the significant sources of non-genetic variation.The overall least square mean of shrinkage percentage was 28.51 ± 0.21 c.m. The comparison of means among genetic groups revealed that the highest in Corriedale X Bannur (31.84 ± 0.64) followed by Deccani (29.69 ± 0.49), Rambouiller X Deccani (29.14 ± 0.72), Corriedale X Deccani (28.43 ± 0.43), Bannur (27.43 ± 0.43) and the least in UAS-improved strain (27.89 ± 0.38). Significant differences in shrinkage percentages were noticed with respect to breed groups and age, period of birth, season of shearing and sex did not have a significant effect on shrinkage percentage.

Keywords : Shrinkage percentage Genetic and non genetic factors Least Square Analysis Deccani Bannur Corriedale and Rambouillet

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