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首页> 外文期刊>Tropical Animal Health and Production >Cold and heat climatic variations reduce indigenous goat birth weight and enhance pre-weaning mortality in subtropical monsoon region of China
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Cold and heat climatic variations reduce indigenous goat birth weight and enhance pre-weaning mortality in subtropical monsoon region of China

机译：冷热气候变化会减少土着山羊出生体重，增强中国亚热带季风地区的断奶前死亡率

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摘要

The subtropical monsoon climate characterized by high or low temperature and humidity can induce cold and heat stress for newborn animals, which results in adverse effect on birth weight and even pre-weaning mortality. However, this early growth performance on indigenous goats is affected by cold and heat climatic environments and is still unclear in subtropical climate. In this study, we continuously measured (July 2011 to June 2016) the birth weight and mortality of an indigenous goat species (n = 530), and collected temperature, humidity, temperature-humidity index (THI) in original farming area, Chongqing, southwest China. As the result, the mean birth weights in cold months (January and February, mean temperature < 10 degrees C and THI < 56) and heat months (July and August, mean temperature > 29 degrees C and THI > 76) were significantly lower (P < 0.05) compared to the other months (June and October, mean temperature = 16~25 degrees C and THI = 61~75). Meanwhile, the birth weight was positively correlated (P < 0.01) with gestational THI from November to May, and was negatively correlated (P < 0.01) with those parameters from June to October, respectively. The maximum pre-weaning mortality, occurring in the 1st month after birth, is 16.17 +/- 2.56%. However, when the birth weight was 20% lower than annual average (2.09 +/- 0.54 kg), the mortality was significantly enhanced (P < 0.01) to 46%. In addition, cold and heat climates respectively enhanced mortality in the 1st month and 2nd~4th months after birth. In conclusion, annually chronic heat and cold climates could play important roles in lowering birth weight and their survival in subtropical monsoon region. Low birth weight and cold temperature play critical role to contribute the advent of higher mortality after birth. Our results potentially provide the appropriate ranges of temperature (16~26 degrees C) and THI (61~75) as pregnant goat and kids raising condition to avoid these negative influences.
机译：通过高温或低温和湿度特征的亚热带季风气候可以诱导新生动物的冷热胁迫，这导致对出生体重的不利影响，甚至是预防的死亡率。然而，本土山羊的这种早期增长性能受到冷热气候环境的影响，亚热带气候仍不清楚。在本研究中，我们不断衡量（2011年7月至2016年6月）土着山羊物种（n = 530）的出生体重和死亡率，并在重庆原农产地区收集的温度，湿度，温度湿度指数（THI），西南中国。结果，寒冷月份（1月和2月，平均温度<10摄氏度<10℃）和热量月（7月和8月，平均温度> 29摄氏度）显着降低（ P <0.05）与其他月份（6月和10月，平均温度= 16〜25摄氏度和THI = 61〜75）。同时，出生体重与11月至5月至5月份的妊娠期THI正相关（P <0.01），并分别与6月份与10月份的参数负相关（P <0.01）。在出生后1个月发生的最大预断奶死亡率，是16.17 +/- 2.56％。然而，当出生体重低于年平均值（2.09 +/- 0.54千克）时，死亡率显着增强（P <0.01）至46％。此外，寒冷和热气候分别增强了第1个月和出生后的第2个月的死亡率。总之，每年慢性热和寒冷气候可以在亚热带季风区降低出生体重及其存活方面发挥重要作用。出生体重和寒冷的低温起到发挥关键作用，以促进出生后的死亡率的出现。我们的结果可能提供适当的温度范围（16〜26摄氏度）和THI（61〜75），因为怀孕的山羊和儿童提高条件以避免这些负面影响。

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