Effects of cross breeding on milk yield and behavior in diffrent breeds of sheep

This research was carried out to study of milk traits، animal behavior and milking rate in third generation crossbreeds of Ghezel-Arkharmerino، Ghezel-Baluchi، Moghani-Arkharmerino، Moghani- Baluchi and Ghezel breed. The test-day milk records started at first week weaning and then test-day milk records were recorded every week and continued to end of lactation. The procedure used for the analysis of the test-day milk yield، milking rate and milking time was mixed model and for animal behavior during milking was categorical data and generalized linear models (CATMOD) in the SAS statistics software. The breed، parity، stage of lactation، latter size، interaction between stage of lactation and breed، interaction between stage of lactation and parity and parity×latter size×stage of lactation were significant effects (P<0. 05) on test-day milk yield. The parity، stage of lactation، latter size، animal interaction between stage of lactation and breed and parity×latter size×stage of lactation were significant effects on milking rate (P<0. 05). The breed and stage of lactation had significant effects on animal behavior during of milking (P<0. 05). Avrage±standard error (gram per day) test-day milk yield in Ghezel ewes، Ghezel-Arkharmerino، Ghezel-Baluchi، Moghani-Arkharmerino، Moghani-Baluchi crossbreds was 343. 9±27، 228±29،272. 5±28،219. 6±29 and 232. 3±27، respectively. The significant difference was between Ghezel breed with all crossbreeds on test-day milk yield (P<0. 05). The significant differences were between Ghezel breed with Ghezel-Arkhamerino and Moghani-Baluchicrossbreeds (P<0. 05) on behavior during milking and milking time. The stage of lactation had significant (P<0. 05) effect on test-day milk yield، milking rate and milking time.