Assessment of the impact of heredity of Holstein Friesians on conformation and milk productivity of cows of Ukrainian breed

Abstract

Increase of the portion of heredity of Holstein Friesians breed in genotype of cows of Ukrainian black-spotted and red-spotted dairy breeds furthers formation of the desired conformation type characteristic of the breed that is being improved and increase of milk productivity. Thus, there are good reasons to breed cows with portion of heredity by Holstein Friesians 87.6% and more, as parameters of cows of this group match best the parameters of the cows of the desired type. On the stage of propagation and improvement of Ukrainian black-spotted and red-spotted dairy breeds, when stock was selected, priority has been given and is given to the manifestation of the desired breed type in animals rather than to portion of conditional heredity of the parental breed [1]. One of the main and the most objective criterion when propagating animals of the desired kind with high and stable milk productivity, sound health and satisfactory reproductive qualities during several lactations is a selection of animals by their conformation type [2, 3, 4, 5]. Ukrainian black-spotted and red-spotted dairy breeds were propagated with maximum use of Holstein Friesians, breed – which is characterized not only by the highest milk productivity in the world, but the best conformation type. Therefore, we have studied and analyzed influence of the portion of conditional inheritance of Holstein Friesians breed in genotypes of the above said dairy breeds on manifestation of their conformation type and productivity.

Збільшення частки спадковості голштинської породи у генотипі корів українських чорно-рябої і червоно-рябої молочних порід сприяє утворенню необхідного типу будови тіла, характерного для породи, яка вдосконалюється і збільшення молочної продуктивності. Таким чином, є вагомі підстави розводити корів з часткою спадковості голштинської породи 87,6% і більше, оскільки параметри корів цієї групи найбільше мають відповідність параметрам корів бажаного типу.