Path coefficient model for assessment of weight using linear traits at birth and at weaning in Nigerian indigenous pig
2014
Direct and indirect effects of some explanatory variables ((body length (BL),
rump height (RH), rump length (RL) , rump width (RW) , shoulder width (SW),
wither height (WH), heart girth (HG) and flank length (FL)) influence on live
weight at birth and at weaning in Nigerian indigenous pigs, managed under
semi intensive system were investigated using path analysis. Results of the
analysis indicated that the correlation coefficient between body weight and
body length at birth was highest (0.59) while at weaning, rump width had the
highest correlation coefficient with body weight (0.60). The relationships
were from low to high. The direct effect of linear traits to body weight at
birth were highest with wither height and flank length similarly heart girth
and rump length had better direct effect on body weight at weaning than other
linear traits. The findings show that there is variability in relationship
between body weight and linear traits with age, similarly both tissues and
bone development play significant role in weight determination in the
indigenous pigs. Thus selection for weight increase at adult phase can better
be achieved at weaning, providing direction for selection towards increase
weight in indigenous pigs.
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