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Milk production of Stara Zagora ewes and their crossbreds with East Friesian rams


Milk production of Stara Zagora ewes and their crossbreds with East Friesian rams



Nauchni Trudove VIZVM, Zootekhnicheski Fakultet, Stara Zagora 26(Yubileina Nauchna Sesiya): 231-238



Data were obtained on 628 ewes, including 89 F1 crossbreds and 119 first and 156 second backcrosses. Milk yield of crossbred females was 42.1% higher and the lactation duration was 15.1% longer than those of their Stara Zagora dams. Milk production of the 2 types of backcross was 7.9 and 11.8% resp. less than in the F1s. Stara Zagora ewes and the second backcrosses averaged their highest yields in the 4th lactation, and F1 crossbreds and first backcrosses in the 2nd.

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