Abstract
Data were collected from 83 Awassi ewes raised on to two flocks during the lambing season (2003-2004). The first flock belongs to private farmers, at Al-Nahrawan region, 5 Kms to the west of Mosul city, whereas the second flock belongs to the General Directorate of Applied Agriculture Researches (Animal Husbandry Station of Mosul). 750 and 614 records of test – day of milk yield and fat percentage, respectively, were used in this study. Data were subjected to statistical analysis using by General Linear Model (GLM) to study the effect of fixed factors on milk yield and fat percentage, to find the correlation coefficients between variables studied and prediction equations of total milk yield . The overall mean of TDMY (Test Day Milk Yield) and fat percentage were 569.824 g, %4.461 respectively. The effects of flock, age of ewe, stage of lactation were significant (p < 0.01) on TDMY. However, the effect of sex of lamb was not significant . All the non-genetic factors studied had significant effect (p < 0.01) on fat percentage. Repeatability estimates for TDMY and fat percentage were 0.481, 0.273 respectively.
