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PSVI-6 Thresholds of Outdoor Temperatures on Fertility Measures of Different Parity Sows in Spanish Herds
Journal of Animal Science ( IF 3.3 ) Pub Date : 2021-05-08 , DOI: 10.1093/jas/skab054.355
Ryosuke Iida 1 , Carlos Piñeiro 2 , Yuzo Koketsu 1
Affiliation  

High temperature is one of the environmental factors which impair sow fertility such as weaning-to-first-mating interval (WMI) and farrowing rate especially in parity 1 sows. The objective of this study was to explore thresholds of temperature damaging fertility in different parity sows. Data of sows serviced from 2011 to 2016 in 142 herds were coordinated with daily maximum temperature (Tmax) from 31 weather stations close to the herds. A two-stage approach was used to determine the best fit model. In the first stage, means and their variance-covariance matrix in each degree Celsius were estimated by a mixed model. Then, piecewise models with a different breakpoint were fitted to the estimates by generalized least squares. Medians of WMI in parity 1 and 2 or higher sows were 5 and 4 days, respectively. Farrowing rates in different parity sows were 85.0–88.7%. The thresholds of mean Tmax during lactation leading to a prolonged WMI were 16 and 23–25°C for parity 1 and 2 higher sows, respectively. The 10°C increase in Tmax from the thresholds delayed WMI in parity 1 and 2 or higher sows by 0.62 and 0.46–0.49 days, respectively (P < 0.01). Meanwhile, the thresholds of mean Tmax from 21 to 14 days before service leading to reductions in farrowing rate were 21, 19 and 21–22°C for parity 0, 1 and 2 or higher sows, respectively. As the Tmax increased by 10°C from the thresholds, farrowing rate in parity 0–1 and 2 or higher sows decreased by 2.9 and 2.2–2.6%, respectively (P < 0.01). Lactating sows in parity 1 suffered from heat stress at a relatively low outdoor temperature. This implies that the temperature is warmer in lactating barns than in outdoor. We recommend changing thermostat set at barns in spring from those in winter in order to increase ventilation rates earlier.

中文翻译:

PSVI-6 室外温度对西班牙猪群不同胎次母猪生育能力测量的阈值

高温是影响母猪繁殖力的环境因素之一,例如断奶至首次交配间隔 (WMI) 和分娩率,尤其是 1 胎母猪。本研究的目的是探讨不同胎次母猪温度损害生育力的阈值。2011 年至 2016 年在 142 个猪群中服务的母猪数据与来自靠近猪群的 31 个气象站的每日最高温度 (Tmax) 进行了协调。使用两阶段方法来确定最佳拟合模型。在第一阶段,通过混合模型估计每个摄氏度的均值及其方差-协方差矩阵。然后,通过广义最小二乘法将具有不同断点的分段模型拟合到估计值。第 1 胎和第 2 胎或更高胎次母猪的 WMI 中位数分别为 5 天和 4 天。不同胎次母猪的产仔率为85.0-88.7%。对于 1 胎次和 2 胎次较高的母猪,泌乳期间导致 WMI 延长的平均 Tmax 阈值分别为 16 和 23–25°C。Tmax 从阈值升高 10°C 会使第 1 胎和第 2 胎或更高母猪的 WMI 分别延迟 0.62 天和 0.46-0.49 天(P < 0.01)。同时,对于 0、1 和 2 胎或更高胎次的母猪,配种前 21 至 14 天导致分娩率降低的平均 Tmax 阈值分别为 21、19 和 21-22°C。随着 Tmax 从阈值升高 10°C,0-1 胎和 2 胎或更高母猪的分娩率分别下降 2.9% 和 2.2-2.6%(P < 0.01)。第 1 胎的泌乳母猪在相对较低的室外温度下遭受热应激。这意味着泌乳舍的温度比室外温度高。我们建议在春季从冬季更改谷仓的恒温器设置,以便更早地提高通风率。
更新日期:2021-05-08
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