Lactation function of first-calf cows of different genotypes at an industrial milk production complex
Journal Title: «Таврійський науковий вісник» - Year 2017, Vol 98, Issue
Abstract
The article contains data on the indicators of persistence of the lactation function in the first lactation of the Schwyz breed and crosses produced from crossing Ukrainian black-and-white (F1 ½UChoRM×½Sh) and red-white (F1 ½UCheRM×½Sh) dairy breeds with Schwyz bulls. It shows that first-calf cows of different genotypes almost do not differ by the indicator of a decrease in milk yields, its value ranging from 73.6 % to 75.0 %. According to the lactation constant of Johansson-Hansson, Schwyz first-calf cows and crosses F1 ½UCheRM×½Sh are characterized by a practically identical value of 97.0 and 96.8 %, respectively, whereas in the crosses F1 ½UChoRM×½Sh the index does not exceed 91.4 %, which is less by 5.6 and 5.4 % (P<0.001) in absolute values. At the same time, in purebred Schwyz cows, the V. B. Veselovskyi index of the sufficiency of lactation and D.V.Yelpatievskyi index of a decrease in lactation are higher by 10.8 and 9.0% (P <0.001) than in the first generation crosses F1 ½UChoRM×½Sh and F1 ½UCheRM×½Sh. The study proves that the level of lactation performance in the first 7 months of lactation in Schwyz first-calf cows is 5777.3 kg of milk on average, which is by 7.53 % higher (P<0,001) than in first-calf cross cows F1 ½UChoRM×½Sh with a productivity of 5342.2 kg.
Authors and Affiliations
Г. В. Перекрестова
Keywords
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