The Effect of Sex Chromatin on Some Reproductive Traits of local Sheep in Erbil

Abstract

This study was conducted on local sheep belongs to private flock in Erbil plain during the period 4 /11/2011 till 25/10/2012. The investigation included 65 local sheep to study the effect of sex chromatin frequency on the Daily Milk Yield (DMY), weight and age of ewes in addition the calculation of Regression and Correlation coefficients between the studied traits of local sheep. The overall means of frequency of sex chromatin (drum stick, Appenx without stick, tear drop and small club). Appeared with normal Neutrophils were 1.897, 1.034, 1.241, 0.741 and 95.86% respectively. The overall means of DMY was 533.6g. The results showed that there was significant (P≤0.05) in relationship to DMY, the highest rate of DMY was shown among the sheep had sex chromatin drum stick (675. 5g), while the rate of DMY was at lowest production among the sheep which had sex chromatin of small club (425.4g). A significant effect of weights and age of sheep on the patterns of sex chromatin were observed. The highest rate of DMY among the sheep was at the age of 4 years raised high rate of sex chromatin type (drum stick). A significant(P≤0.05) positive Correlation coefficient between DMY and sex chromatin type (drum stick) with value of 0.673, while there was a negative and significant (P≤0.05). Regression coefficient of DMY on sex chromatin coefficient (small club ) with coefficient of Regression value (- 0.074). In addition the highest value of Correlation between the DMY and sex chromatin of (drum stick) was (0.856), followed with Correlation coefficient value between type of birth and weights of ewes (0.784), while the lowest Correlation value was (-0.087) between DMY and sex chromatin of (small club).