مجلة مركز بحوث التقنيات الاحيائية (Jan 2016)
Role of sex chromatin on performance in the local (black) goats
Abstract
This study was conducted on local black goats belongs to private flock in Erbil plain from period July/ 2014 to April/ 2015. The study included 116 local black goats to study role of sex chromatin on the daily milk production (DMP), total milk production (TMP), lactation period (LP), Fertility rate, Prolificacy, birth weight (BW), fertilize estrous sequences and correlation coefficients between the studied traits and repeatability of (DMP). The ratio of sex chromatin shapes drum stick, sessile nodule, tear drop and small club were%32.05, %52.97, %8.52 and%6.46respectively. The overall means of DMP, TMP, LP, Fertility rate, Prolificacy, BW and fertilize estrous sequences were 577.78g, 49.21kg, 85.70days, %75.74 ,1.35 ,3.01 kg and 1.50respectively. Sex chromatin shapes had significant effect on all of the characterize studied. The results showed that there is significant (P<0.05) in relation to (DMY), the highest rate of (DMY) was shown among the goats. The highest level of (DMP) was in animals which raised drum stick sex chromatin (681.03g), while the lowest level was among sheep which raised sex chromatin small club (514.77g), also, there are significant effect of sex chromatin shapes on fertility rate, prolificacy, BW, and fertilize estrus sequences. Correlation coefficient value between (DMP) correlated positively 0.88, 0.54, 0.33, and 0.31 for drum stick, sessile nodule, tear drop and small club respectively. Repeatability estimates for (DMP) 0.38. The conclusion of this study is the prediction of production (milk production and BW) and reproduction (Fertility rate, Prolificacy and fertilize estrous sequences) performance for local black goats from shapes and percentage of sex chromatin distribution and measurements. The sex chromatin shapes helped in doing early selection to elite goats on the linkage between sex chromatin shapes and performance production.
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