Birth defects in first-calf heifers with the use of stud bulls with different index values of “calving ease”

M. Lapina, G. Kovaleva, N. Sulyga, V. Vitol
{"title":"Birth defects in first-calf heifers with the use of stud bulls with different index values of “calving ease”","authors":"M. Lapina, G. Kovaleva, N. Sulyga, V. Vitol","doi":"10.52419/issn2072-2419.2022.4.374","DOIUrl":null,"url":null,"abstract":"In recent years, there has been a tendency to reduce the age of the first insemination of replacement heifers of dairy breeds. However, calving at an early age is often accompanied by complications, which lead to stillborn offspring. In order to reduce the risk of a pathological calving, it is recommended to use stud bulls with an index value of “calving ease” of no more than 2.2 for insemination of heifers of dairy breeds, but there are no objective data on the effect of this index on birth defects. The purpose of our research was to study the calving ease and the stillbirth in offspring of first-calf heifers of three age groups, which were inseminated by bulls with an index of “calving ease” of 1.6 and 1.8-2.1. The difference in the number of difficult calving in favor of first-calf heifers, which were inseminated by stud bulls with an index of “calving ease” of 1.6, was 8.7%. The greatest difference between the experimental groups was at the first insemination at the age of 12-13 months – 29.2%. With an increase in the age of the first insemination, the difference between the experimental groups decreased and amounted to 11.3% at the age of 14-15 months. The minimum difference between the experimental groups was when animals were inseminated at the age of 16-18 months – 5.2%. From using stud bulls with an index of “calving ease” of 1.6, they obtained 9.7% of stillborn offspring, while with an index of “calving ease” of 1.8-2.1 – 17.7%. As for age subgroups, the difference in favor of the animals of the first experimental group, in comparison with the second experimental group, was 5.5%, 4.5% and 10.8%, respectively. The greatest number of difficult calving and stillborn offspring was registered with the first insemination of experimental animals at the age of 12-13 months. This correlation was typical for both the first and second experimental groups.","PeriodicalId":14419,"journal":{"name":"International Journal of Veterinary Medicine","volume":"102 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Veterinary Medicine","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.52419/issn2072-2419.2022.4.374","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

In recent years, there has been a tendency to reduce the age of the first insemination of replacement heifers of dairy breeds. However, calving at an early age is often accompanied by complications, which lead to stillborn offspring. In order to reduce the risk of a pathological calving, it is recommended to use stud bulls with an index value of “calving ease” of no more than 2.2 for insemination of heifers of dairy breeds, but there are no objective data on the effect of this index on birth defects. The purpose of our research was to study the calving ease and the stillbirth in offspring of first-calf heifers of three age groups, which were inseminated by bulls with an index of “calving ease” of 1.6 and 1.8-2.1. The difference in the number of difficult calving in favor of first-calf heifers, which were inseminated by stud bulls with an index of “calving ease” of 1.6, was 8.7%. The greatest difference between the experimental groups was at the first insemination at the age of 12-13 months – 29.2%. With an increase in the age of the first insemination, the difference between the experimental groups decreased and amounted to 11.3% at the age of 14-15 months. The minimum difference between the experimental groups was when animals were inseminated at the age of 16-18 months – 5.2%. From using stud bulls with an index of “calving ease” of 1.6, they obtained 9.7% of stillborn offspring, while with an index of “calving ease” of 1.8-2.1 – 17.7%. As for age subgroups, the difference in favor of the animals of the first experimental group, in comparison with the second experimental group, was 5.5%, 4.5% and 10.8%, respectively. The greatest number of difficult calving and stillborn offspring was registered with the first insemination of experimental animals at the age of 12-13 months. This correlation was typical for both the first and second experimental groups.
使用不同“产犊容易度”指数的公种公牛对初产母牛出生缺陷的影响
近年来,有一种趋势是降低奶牛品种替代小母牛的第一次授精的年龄。然而,早期产犊往往伴随着并发症,导致死产后代。为了降低病理性产犊的风险,建议使用“产犊易度”指数不大于2.2的种公牛进行奶牛品种的授精,但该指数对出生缺陷的影响尚无客观数据。本研究以“产犊容易度”指数分别为1.6和1.8 ~ 2.1的公牛为对象,研究了3个年龄组首犊母牛的产犊容易度和死产率。用“产犊容易度”指数为1.6的种公牛进行授精的头犊母牛产犊困难的数量差异为8.7%。试验组间差异最大的是12-13月龄第一次授精- 29.2%。随着首次授精年龄的增加,实验组之间的差异减小,14-15月龄时差异为11.3%。当动物在16-18个月时进行人工授精时,实验组之间的最小差异为5.2%。使用“产犊难”指数为1.6的种公牛,死产率为9.7%,“产犊难”指数为1.8-2.1 - 17.7%。在年龄亚组上,第一实验组与第二实验组对动物的好感度差异分别为5.5%、4.5%和10.8%。实验动物首次授精时12-13月龄的产犊困难和死产仔数最多。这种相关性在第一和第二实验组中都很典型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信