用流行病学方法对日本黑牛产犊间隔的育性性状进行分类。

IF 1.6 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Osuke Suzuki, Mizuho Uematsu, Go Kitahara, Takeshi Osawa, Yosuke Sasaki
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引用次数: 0

摘要

产犊间隔(CI)是决定日本黑牛繁殖性能的重要因素。本研究旨在比较CI分类农场的个体肥力性状。2011年至2014年,来自日本宫崎市622个农场的7327头奶牛共获得了49780次人工授精(AI)记录。将农场分为三组(称为农场CI组),使用农场CI的上下25个百分位数作为阈值。奶牛个体的平均CI为403.5±70.9 d。单头奶牛CI的四分位数区间,短CI为49 d,长CI为114 d。产犊和第一次人工智能之间的间隔与农场CI组和胎次有关
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fertility Traits in Japanese Black Cows in Farms Classified by Calving Intervals Using Epidemiological Methods.

The calving interval (CI) is an important determinant of reproductive performance in Japanese Black cattle. The present study aimed to compare individual fertility traits among farms classified by CI. In total, 49,780 artificial insemination (AI) records for 7327 cows from 2011 to 2014 were obtained from 622 farms located in Miyazaki, Japan. The farms were classified into three groups (referred to as farm CI groups) using the lower and upper 25 percentiles of farm CI as thresholds. The mean CI of individual cows was 403.5 ± 70.9 days. The interquartile ranges of CI for individual cows were 49 days for short CI farms and 114 days for long CI farms. The interval between calving and the first AI was associated with farm CI group and parity (p < 0.05) but not with calving season and gestation length. The conception rate (CR) at the first AI in cows on long CI farms decreased as the interval from calving to the first AI decreased (p < 0.05). Additionally, no differences in CR among farm CI groups were observed for AI number ≥ 4. In long CI farms, cows with two AI treatments had longer interservice intervals than those for AI values of 3 and ≥ 4 (p < 0.05). In summary, fertility characteristics for long CI farms differed from those of farms with short or middle CI, and standard operating procedures need to be improved to decrease the CI.

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来源期刊
Reproduction in Domestic Animals
Reproduction in Domestic Animals 农林科学-奶制品与动物科学
CiteScore
3.00
自引率
5.90%
发文量
238
审稿时长
4-8 weeks
期刊介绍: The journal offers comprehensive information concerning physiology, pathology, and biotechnology of reproduction. Topical results are currently published in original papers, reviews, and short communications with particular attention to investigations on practicable techniques. Carefully selected reports, e. g. on embryo transfer and associated biotechnologies, gene transfer, and spermatology provide a link between basic research and clinical application. The journal applies to breeders, veterinarians, and biologists, and is also of interest in human medicine. Interdisciplinary cooperation is documented in the proceedings of the joint annual meetings. Fields of interest: Animal reproduction and biotechnology with special regard to investigations on applied and clinical research.
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