N. Shevchuk. Evaluation of highly productive families of the Ukrainian Red Dairy Breed

N. Shevchuk

In breeding work with breeds, herds play a significant role in families that are characterized by high tribal value by a set of features. In a work with a herd of the Ukrainian Red Dairy Breed, it is expedient to analyze milk production of cows of high-yielding families.

The highest levels of dairy productivity were found in the families of Tsarivna 968, Malyna 22, Purga 5842, Pilotka 4838 and Bistra 1988, whose milk production during all lactation ranged from 4473 to 4727 kg of milk. One of the important indicator of productivity is the fat content in milk. The following families were the most fatty ones like Purga 5842, Pilotka 4838, Malyna 22, Luna 610, Voloshka 1496, Liana 02900 and Rozetka 2888. They had the advantage for fat content in milk compared to the Travka 7858family.

The duration of the inter-birth period is an important indicator of the reproductive capacity of cows. The extended inter-birth period for families Pilotka 4838, Bistra 1988 and Malyna 22 was 388,1-411,5 days. They had a definite advantage over the Kukla family 226 and the difference was, according to family names, 46,5 days (P > 0,99); 53,6 days (P > 0,95) and 69,9 days (P > 0,99).

A low coefficient of reproduction is observed in cows of different families during  the long inter-birth period. Its optimal number belongs to for the families Tsarivna 968, Zmiyka 266, Liana 02900 and Kukla 226.Their reproductive ability ratesfrom 1,02  to 1,07. The difference in comparison to Malyna 22family is 0,10 (P > 0,95); 0,14 (P > 0,95); 0,14 (P > 0,99) and 0,15 (P > 0,999) accordingly to names.

It should be noted that the majority of the studied high-yielding familiesof Ukrainian Red Dairy Breeds are characterized by optimal values of reproductive capacity, and only three families Malyna 22, Pilotka 4838 and Bistra 1988 are characterized by a lower indicator of KVZ (0,92-0,94).

Thus, the best families for milk production, which combine high milk yield and fat content in milk, are the families of Bistra 1988 and Pilotka 4838.

Key words: breed, selection, family, ancestor, sign, milk productivity, reproductive ability.

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