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Comparative studies of growth development and milk performance of f 2 and r 1 crosses of bulgarian simmental cows with ayrshire bulls



Comparative studies of growth development and milk performance of f 2 and r 1 crosses of bulgarian simmental cows with ayrshire bulls



Zhivotnov"dni Nauki 16(4): 10-17



A comparative trial involving 3 groups of 18 female coeval calves each was conducted in 1974-1977 to establish their weight and linear development, milk performance and udder ease-of-milking. Group I included Bulgarian Simmental calves (BS); group II, crosses of BS with 75% Ayrshire blood (F2); and group III, + crosses of BS with 25% Ayrshire blood (R1). Female breeding calves, F2 and R1 crosses, had mean birth weight of 34.33 kg and 36.39 kg respectively; the corresponding figure for their BS coevals was 40.15 kg. Nonessential difference was observed in live weight among the 3 groups to age 6 mo. R1 crosses followed BS live weight and at 1st lactation they come abreast of it. F2 crosses lagged behind BS in their weight development by 62.8 kg at 1st lactation and by 66.1 kg behind R1 crosses. The Ayrshire breed considerably affected the milk yield of Bulgarian Simmental cows which increased by 1377.56 kg (56%) for F2 crosses and by 555.56 kg (22.7%) for R1 crosses. F2 and R1 crosses had better developed udder compared with their BS coevals. Their teats were shorter and thin. Udder mean ease-of-milking was 1.778 kg/min for F2 crosses, 1.389 kg/min for R1 crosses and 1.244 kg/min for the Bulgarian Simmentals.

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