Genetic Studies on Some Production and Reproduction Traits in Landrace and Their Halfbreds
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Date
1989
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Birsa Agricultural University, Ranchi
Abstract
The present investigation was undertaken to study the genetics of growth in terms of liveweight and linear body measurements from birth to 16th week of age along with mortality and feed efficiency at various stages of life in Landrace, desi and their crosses under farm managemental conditions. The following conclusions were drawn :
1. Significant effect of genetic group on body weight, body length, chest girth, height at withers at various ages, litter size and litter weight at birth and at weaning, pre-weaning and post-weaning daily weight gain, mortality percentage and feed efficiency was observed.
2. Landrace vas superior in respect of all the economic traite to halfbreds followed by desi.
3. of total deaths 64.20% occurred within two weeks of birth.
4. The efficiency of prediction of body weight on various linear body measurements was, in general, of moderate to high magnitude. There was a progressive increase in efficiency with the increase of age.
5.Significantly superior feed conversion efficiency was noticed in Landrace followed by halfbreds and desi.
6. All the phenotypic correlations of body weights with linear body measurements were positive and significant at all the ages.
7. Most of the genetic correlations between body weight and linear body measurements were positive and high.