Seasonal changes in the reproductive performance in local cows receiving artificial insemination in the Pursat province of Cambodia.
Seasonal changes in the reproductive performance in local cows receiving artificial insemination in the Pursat province of Cambodia.
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DOI：
10.5713/ajas.19.0893
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发表时间：
2020-12
期刊：
影响因子：
--
通讯作者：
Pheng V
中科院分区：
文献类型：
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作者：
Tep B;Morita Y;Matsuyama S;Ohkura S;Inoue N;Tsukamura H;Uenoyama Y;Pheng V
本研究旨在调查热带国家柬埔寨Pursat省接受人工授精（AI）的当地奶牛繁殖性能的季节性变化，以调查环境条件是否影响奶牛的繁殖性能，从而更好地了解牛生产的主要问题。分析了2016年至2017年第一次接受人工智能的奶牛接受人工智能的数量、产犊次数和产犊率。根据Pursat的最高温度和降雨量，将一年分为冷/干（11月至2月）、热/干（3月至6月）和湿（7月至10月）三个季节，分析环境条件与奶牛繁殖性能的关系。并分析了各季节的体况评分（BCS）和饲养方案。凉爽/干燥季节接受人工智能的奶牛数量显著高于湿润季节。冷/干季饲喂AI的奶牛产犊次数和产犊率显著高于热/干/湿季。奶牛在冷/干季比热/干季和湿季表现出更高的bcs，这可能是由于喂养方案的季节性变化：这些奶牛在冷/干季以野生草为食，而在热/干季和湿季以有限数量的草和稻草为食。本研究表明，奶牛接受人工授精的数量少、产犊数量少、产犊率低可能主要是由于干热季节和湿季饲喂方案不佳导致的身体状况不佳。通过改进喂养方案改善身体状况可能有助于提高柬埔寨热/干和湿季节奶牛的繁殖性能。
The present study aimed to survey seasonal changes in reproductive performance of local cows receiving artificial insemination (AI) in the Pursat province of Cambodia, a tropical country, to investigate if ambient conditions affect the reproductive performance of cows as to better understand the major problems regarding cattle production. The number of cows receiving AI, resultant number of calving, and calving rate were analyzed for those receiving the first AI from 2016 to 2017. The year was divided into three seasons: cool/dry (from November to February), hot/dry (from March to June), and wet (from July to October), based on the maximal temperature and rainfall in Pursat, to analyze the relationship between ambient conditions and the reproductive performance of cows. Body condition scores (BCS) and feeding schemes were also analyzed in these seasons. The number of cows receiving AI was significantly higher in the cool/dry season than the wet season. The number of calving and calving rate were significantly higher in cows receiving AI in the cool/dry season compared with the hot/dry and wet seasons. The cows showed higher BCSs in the cool/dry season compared to the hot/dry and wet seasons probably due to the seasonal changes in the feeding schemes: these cows grazed on wild grasses in the cool/dry season but fed with a limited amount of grasses and straw in the hot/dry and wet seasons. The present study suggests that the low number of cows receiving AI, low number of calving, and low calving rate could be mainly due to poor body condition as a result of the poor feeding schemes during the hot/dry and wet seasons. The improvement of body condition by the refinement of feeding schemes may contribute to an increase in the reproductive performance in cows during the hot/dry and wet seasons in Cambodia.