Study Of The Canonical Correlation Between Reproductive And Egg Production Characteristics In The Local Brown Chicken Selected For The Genetic Diversity Of The Neuropeptide Y Gene

Abstract

Majid Mohsen Salman Al-ameri.

The results of the current study and from the estimates of the Canonical correlation coefficient indicated an important linear relationship in both directions between the first group of variables S1 (reproductive traits) and the second group of variables the S2 (productive traits) which are the independent variable matrix and the dependent variable matrix respectively in the Iraqi local brown chicken flock, that were selected to the genetic diversity of the NPY gene, which showed a highly significant canonical correlation coefficient (P <0.01) has reached 81%, as body weight was affected by age at sexual maturity due to the presence of a positive and weak correlation coefficient of 21%, as was the rate of egg production at all stages Productivity (the period before production, the period of the peak of production, the period post-peak of production) by age at sexual existence, due to the presence of a negative correlation coefficient that ranged between average and strong (-74, -45 and -51%, respectively), and these results revealed the contribution of the first pair of variables Canonical (body weight at sexual maturity, egg production before the summit) of the two matrix variants (S1 and S2), in influencing egg production in subsequent productive periods of having positive and strong correlation coefficients of 92 and 94%, respectively, and contributed Estimates of the linear correlation coefficient between the corresponding variables in the matrix in revealing the negative linear relationship, which reached the highest influential value for age at sexual maturity - 89%. Therefore, the age variable at sexual maturity and the total production variable for the number of eggs is one of the most efficient factors that focus on in the selection programs for selecting the superior parents in producing eggs in the local brown herd of Iraqi chickens.