Interrelationships and Phenotypic Correlations among Body Dimensions in Commercial Pullets Reared in the Derived Savannah Zone of Nigeria
This research work was conducted to evaluate the relationship between live body weight and linear body measurements in three strains of commercial layers reared under intensive system of management. Traits considered were body weight, body length, thigh length, shank length, breast girth, while the feed variables were feed intake, feed conversion ratio and feed efficiency. There were significant (P<0.01) phenotypic correlations between body weight and linear measurements in all the three strains. Feed intake and feed efficiency also have high phenotypic correlations with body weight and linear measurements, whereas the reverse was the case with feed conversion ratio. In general, some traits had very high significant positive phenotypic correlations with body weight, some recorded medium phenotypic correlation values while some had low correlation values with body weight. Traits that recorded high phenotypic correlations with body weight are body length, thigh length, feed intake and feed efficiency, those with medium phenotypic correlations are shank length and breast girth, while trait with low phenotypic correlations was feed conversion ratio. The obtained results indicate pleiotropic effects of genes operating on these traits. The implication is that selection for any of the traits in these strains will lead to improvement of others.
Strain, Phenotypic Correlation, Trait, Feed Efficiency, Pleiotropic, Weight
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