Form and functional properties of the udder of the black-and-white cattle of different selectio
Abstract
The form and functional properties of the udder of Black-and-White cattle of Dutch, West German, East German and Ukrainian selection and their connection with dairy productivity were studied. It is established that among the Black-and-White cattle of Dutch selection 66% of cows had a cup-shaped udder, 22 - bath-shaped and 12% - round, among West German - 66, 23 and 11%, East German - 71, 22 and 7% and Ukrainian selection - 50, 24 and 26% respectively. Animals with cup-shaped and bath-like form of the udder had the highest milk yields. Among the animals of Dutch selection of cows with these forms breast milk, depending on lactation, prevailed over individuals with a rounded form of udder by 401-1424 kg, West German selection – by 1386-2747 kg, East German selection - by 546-1396 kg and Ukrainian selection - by 167-788 kg at P & lt; 0.05-0.001 in most cases. Among the animals of West German selection, cows with cup-shaped udder had highest fat content in milk, and East German selection - in cows with a rounded form of udder. No dependence was found in animals of Dutch and Ukrainian selection the above indicator of the form of udder. Animals of Dutch, East and West German origin selection prevailed animals of Ukrainian selection by daily milk yield, by 3.4; 3.1 and 2.0 kg at P<0.001, and cows of Dutch and West German selection predominated East German selection by 1.4 (P<0.001) and 1.1 kg (P<0.001), respectively. Coefficient of the variability of this feature was in the range of 13.6-19.1%. The intensity of milk production in cows - the firstborn of foreign selection was 1.71-1.75 kg / min., Ukrainian selection - 1.58 kg / min. The coefficient of variability of the intensity of milk production in cows of foreign selection was in the range of 15.2-21.9%, and in animals of domestic selection it was much lower and amounted to 6.7%. Correlation coefficient between daily milk yield and milk production intensity in foreign cows selection was negative, statistically significant and ranged from -0.145 (P<0.05) to -0.238 (P<0.001), and in animals of domestic selection - low positive and was 0.174. Strength of influence of udder form on the yields of cows, depending on selection and lactation, ranged from 7.5 to 22.5, on the fat content in milk - from 0.3 to 12.7 and the amount of milk fat - from 8.3 to 23.6%.
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