文章基本信息

标题：Formation of reproductive organs of young livestock depending on paratypic factors
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作者：Alexey Zelenkov ; Galina Zelenkova ; Alexey Ermakov 等
期刊名称：E3S Web of Conferences
印刷版ISSN：2267-1242
电子版ISSN：2267-1242
出版年度：2020
卷号：164
页码：1-8
DOI：10.1051/e3sconf/202016406032
出版社：EDP Sciences
摘要：The study was conducted to identify the early use of young animals (gobies and heifers) in cattle for breeding purposes. The condition under which the research was carried out was intensive and traditional rearing of young cattle. In the experimental groups, feeding was intense, and in the control groups – according to the accepted technology in the farm. Young growth was carried out until the age of 15 months. Under such different growing conditions, we have established the features of the formation of reproductive organs in gobies and heifers. The good development of the genitals of the heifers of the experimental group, and especially the ovaries, made it possible to carry out their fruitful insemination in the period from 13 to 14 months of age. For this, two bulls were selected from the experimental group at the age of 12-13 months, which, by manual mating, inseminated 20 heifers for a month. During a rectal examination, they turned out to be all pregnant and in due time, without complications, became hotels, gave normal viable offspring. Calving calves aged 22-23 months during 1 lactation they were in no way inferior in milk production to heifers inseminated at the age of 24-28 months and calving at 33-37 months.