文章基本信息

标题：The effect of age on milk productivity and reproductive qualities of dairy cows
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作者：L V Holodova ; K S Novoselova ; E V Mikhalev 等
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：315
期号：2
页码：1-7
DOI：10.1088/1755-1315/315/2/022087
出版社：IOP Publishing
摘要：The article presents data on the age dynamics of changes in the level of dairy productivity of cows. As a result of the research, the increase in milk yield and the increase amount of milk fat and protein with age of animals was established. The age dependence of qualitative indicators of milk production wasn't revealed. It was noted that the level of milk productivity of cows in all age periods was higher than the requirements of the first class standard of black-motley breed. An average positive correlation was found between age and milk yield. It was revealed that the productivity of cows is largely determined by their linear affiliation. When analyzing the age-related changes in the reproductive capacity of cows was revealed that the duration of the service period decreases with the age of the animals. When analyzing the age-related changes in the reproductive capacity of cows was revealed that the duration of the service-period decreases with the age of the animals. The duration period between the calves of the average for the cows was optimal, while its reduction with age was observed. It's noted that as the age of cows increases, the number of inseminations for fertilization increases.