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首页> 外文期刊>Journal of Animal Physiology and Animal Nutrition >Impact of heat stress, nutritional restriction and combined stresses (heat and nutritional) on growth and reproductive performance of Malpura rams under semi-arid tropical environment
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Impact of heat stress, nutritional restriction and combined stresses (heat and nutritional) on growth and reproductive performance of Malpura rams under semi-arid tropical environment

机译：半干旱热带环境下热应激，营养限制和综合应激（热和营养）对马尔普拉公羊生长和生殖性能的影响

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摘要

A study was conducted to assess the combined effect of heat stress and nutritional restriction on growth and reproductive performances in Malpura rams. Twenty-eight adult Malpura rams (average body weight (BW) 66.0kg) were used in this study. The rams were divided into four groups: CON (n=7; control), HES (n=7; heat stress), NUS (n=7; nutritional stress) and COS (n=7; combined stress). The study was conducted for a period of 2months. CON and HES rams had adlibitum access to their feed while NUS and COS rams were under restricted feed (30% intake of CON rams) to induce nutritional stress. The HES and COS rams were kept in climatic chamber at 42 degrees C and 55% relative humidity for 6h a day between 10:00h and 16:00h to induce heat stress. Body weight increased significantly (p0.05) in CON as compared to NUS and COS. When compared within groups, scrotal width morning, scrotal width afternoon, scrotal circumference morning and scrotal circumference afternoon were significantly (p0.05) larger in CON while smaller in COS rams. The higher testicular length was recorded both during morning (p0.05) and afternoon (p0.01) in COS rams while the lowest in NUS rams. The highest plasma testosterone concentration was recorded in CON and lowest in COS rams. Semen volume and mass motility also differed significantly (p0.05) between the groups. The highest semen volume and mass motility was recorded in CON and NUS while lowest in both HES and COS rams. It can be concluded from this study that when two stressors occur simultaneously, they may have severe impact on reproductive performance of rams.
机译：进行了一项研究，以评估热应激和营养限制对马尔普拉公羊生长和生殖性能的综合影响。在这项研究中使用了28只成年的Malpura公羊（平均体重（BW）66.0kg）。将公羊分为四组：CON（n = 7;对照），HES（n = 7;热应激），NUS（n = 7;营养应激）和COS（n = 7;综合应激）。该研究进行了两个月的时间。 CON和HES公羊可随意进食，而NUS和COS公羊则受到限制饲料（CON公羊摄入量为30％）以诱导营养压力。 HES和COS公羊在10：00h和16：00h之间每天在42摄氏度和55％相对湿度的气候室内保持6h，以诱导热应激。与NUS和COS相比，CON的体重显着增加（p <0.05）。在COS公羊中。 COS公羊在上午（p <0.05）和下午（p <0.01）均记录到较高的睾丸长度，而在NUS公羊中则最低。在CON中记录到最高血浆睾丸激素浓度，在COS公羊中记录最低血浆睾丸激素浓度。两组之间精液量和运动力也有显着差异（p <0.05）。 CON和NUS的精液量和运动性最高，而HES和COS精子的最低。从这项研究可以得出结论，当同时出现两个压力源时，它们可能对公羊的繁殖性能产生严重影响。

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