Decrease in body surface temperature before parturition in ewes

H. Nabenishi, A. Yamazaki
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引用次数: 11

Abstract

This study investigated the correlation between the body surface temperature (BST) and core body temperature of ewes and changes in BST during the prepartum stage in pregnant ewes. Four non-pregnant adult ewes were used in the first experiment. The BST of the upper neck, vaginal temperature (VT), and ambient temperature (AT) were measured every 10 min for seven days and analyzed for correlations. The mean (± SD) BST and VT of ewes during the study period were 35.4 ± 1.7°C and 39.1 ± 0.4°C, respectively, with a correlation of r = 0.62, P < 0.001. This finding suggested that the BST was associated with core body temperature in ewes. In the subsequent experiment, seven pregnant ewes in their third trimester were used to evaluate changes in BST measured at the upper neck 72 h before parturition. The mean BST at –24–0 h (0 h = time of parturition) was significantly lower than that at –72– –48 h and –48– –24 h (P < 0.05). The BST tended to decrease toward parturition; all BST measurements at –16– –3 h were significantly lower than those at –72 h (P < 0.05). A clear circadian rhythm in the BST was observed at two days and the day before parturition and an unclear circadian rhythm was observed on the day of parturition. Therefore, these findings indicate that the BST also decreases before parturition, as do vaginal and rectal temperatures.
母羊出生前体表温度下降
本研究探讨了母羊体表温度(BST)和核心体温与妊娠前期母羊体表温度(BST)变化的相关性。第一次试验选用4只未怀孕的成年母羊。上颈部BST、阴道温度(VT)和环境温度(AT)每10分钟测量一次,持续7天,并分析相关性。研究期间母羊BST和VT的平均值(±SD)分别为35.4±1.7°C和39.1±0.4°C,相关系数r = 0.62, P < 0.001。这一发现表明母羊的BST与核心体温有关。在随后的实验中,7只妊娠晚期的母羊被用来评估分娩前72小时在上颈部测量的BST的变化。分娩时- 24 ~ 0 h (0 h =分娩时间)的平均BST显著低于- 72 ~ - 48 h和- 48 ~ - 24 h (P < 0.05)。分娩前BST呈下降趋势;- 16 ~ - 3 h的BST值均显著低于- 72 h (P < 0.05)。在分娩前2天和前一天观察到明显的BST昼夜节律,在分娩当天观察到不明确的昼夜节律。因此,这些发现表明,分娩前BST也会下降,阴道和直肠温度也会下降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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