Association between prepartum vaginal temperature changes and placenta expulsion time in Holstein dairy cattle.

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Accounts of Chemical Research Pub Date : 2024-10-01 Epub Date: 2024-07-10 DOI:10.1262/jrd.2024-012
Miki Sakatani, Kaiyu Kubota, Satoshi Haga, Masafumi Miwa
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Abstract

Retained placenta (RP) adversely affects postpartum productivity and reproduction in dairy cattle. Thus, methods to predict the occurrence of RP before calving would be desirable. Herein, we assessed whether vaginal temperature measurements (which have already been applied to detect calving) could be used to predict the occurrence of RP in cattle. A vaginal temperature recording device was inserted into the vagina of 49 pregnant Holstein-Friesian heifers (n = 16) and cows (n = 33); this device recorded the vaginal temperature every 5 min until the device dropped out at calving. Serum was collected 10 days before the expected calving date. The time points of calving and placental expulsion were identified via video recordings. We further calculated calving duration (temperature decrease to calving) and placenta expulsion time (PE time = calving to placenta expulsion). The PE times were divided into four categories (0-4 h, 4-8 h, 8-12 h, and RP at >12 h), while subsequent analysis revealed that an extension of the PE time dependent on the shortening of the calving duration (P < 0.05). The vaginal temperature patterns also differed in a PE time-dependent manner, and cows with RP did not show any re-elevation of vaginal temperature. Serum analyses indicated an energy deficiency in RP cattle. These results suggest that RP may be detected early as a specific change in the vaginal temperature associated with reproductive hormone secretion.

荷斯坦奶牛产前阴道温度变化与胎盘排出时间的关系。
胎盘滞留(RP)会对奶牛的产后生产力和繁殖产生不利影响。因此,在产犊前预测 RP 发生的方法是可取的。在此,我们评估了阴道温度测量(已用于检测产犊)是否可用于预测牛 RP 的发生。我们在 49 头荷斯坦-弗里斯兰怀孕母牛(16 头)和母牛(33 头)的阴道内插入了阴道温度记录装置,该装置每 5 分钟记录一次阴道温度,直到产犊时装置掉落。血清在预产期前 10 天采集。通过视频记录确定产犊和胎盘排出的时间点。我们进一步计算了产犊持续时间(从体温下降到产犊)和胎盘排出时间(PE 时间 = 产犊到胎盘排出)。胎盘排出时间分为四类(0-4 h、4-8 h、8-12 h 和 RP >12 h),随后的分析表明,胎盘排出时间的延长取决于产犊持续时间的缩短(P < 0.05)。阴道温度的变化也与PE时间有关,RP的奶牛阴道温度没有再次升高。血清分析表明,RP 牛存在能量缺乏。这些结果表明,RP 可通过与生殖激素分泌相关的阴道温度的特定变化而被早期检测出来。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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