The influence of the level of productivity of mothers during the first lactation on the productive longevity of daughters

Abstract

Relevance. The most important condition for increasing the competitiveness and profitability of dairy cattle breeding is to increase the duration of productive use of the breeding stock and, especially, highly productive cows. It is known that the more intensively animals are used, the less costs per unit of production, the more profitable and profitable milk production becomes.Methods. The research was carried out based on the materials of the primary zootechnical accounting of the SELEX program of retired Holstein cows from 2017 to 2019 in the herd of LLC «A7 Agro-RB» of the Zianchurinsky district of the Republic of Bashkortostan. To study the effect of the level of productivity of mothers on the duration of use and lifetime productivity of cows-daughters, the animals were divided into groups depending on the level of milk yield of mothers for the first lactation with a class interval of 1000 kg: group I — up to 5000 kg, II — 5001–6000 kg, III — 6001–7000 kg, IV — 7001–8000 kg, V — 8001 and more.Results. The longest period of economic use was distinguished by daughters with mothers' milk yield for the first lactation up to 5000 kg — 3,30 lactations, which significantly exceeds the average values for the herd (2,58 lactations). The greatest lifetime milk yield (21 003 kg) was characterized by daughters from group IV. Their superiority over the animals of group I was 154 kg, group II — 391 kg, group III — 1639 kg and group V — 4303 kg. The highest average milk yield on the 1st day of the daughterʼs life was in animals of group IV — 12,01 kg, surpassing peers from group I by 2,46 kg, group II — by 1,84 kg, group III — by 1,54 kg and group V — by 0,93 kg.