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首页> 外文期刊>Asian-Australasian Journal of Animal Sciences >Effect of Simulated Heat Stress on Digestibility, Methane Emission and Metabolic Adaptability in Crossbred Cattle
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Effect of Simulated Heat Stress on Digestibility, Methane Emission and Metabolic Adaptability in Crossbred Cattle

机译：模拟热应激对杂交牛消化率，甲烷排放和代谢适应性的影响

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摘要

The present experiment was conducted to evaluate the effect of simulated heat stress on digestibility and methane (CH4) emission. Four non-lactating crossbred cattle were exposed to 25 degrees C, 30 degrees C, 35 degrees C, and 40 degrees C temperature with a relative humidity of 40% to 50% in a climatic chamber from 10:00 hours to 15:00 hours every day for 27 days. The physiological responses were recorded at 15:00 hours every day. The blood samples were collected at 15:00 hours on 1st, 6th, 11th, 16th, and 21st days and serum was collected for biochemical analysis. After 21 days, fecal and feed samples were collected continuously for six days for the estimation of digestibility. In the last 48 hours gas samples were collected continuously to estimate CH4 emission. Heat stress in experimental animals at 35 degrees C and 40 degrees C was evident from an alteration (p<0.05) in rectal temperature, respiratory rate, pulse rate, water intake and serum thyroxin levels. The serum lactate dehydrogenase, aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase activity and protein, urea, creatinine and triglyceride concentration changed (p<0.05), and body weight of the animals decreased (p<0.05) after temperature exposure at 40 degrees C. The dry matter intake (DMI) was lower (p<0.05) at 40 degrees C exposure. The dry matter and neutral detergent fibre digestibilities were higher (p<0.05) at 35 degrees C compared to 25 degrees C and 30 degrees C exposure whereas, organic matter (OM) and acid detergent fibre digestibilities were higher (p<0.05) at 35 degrees C than 40 degrees C thermal exposure. The CH4 emission/kg DMI and organic matter intake (OMI) declined (p<0.05) with increase in exposure temperature and reached its lowest levels at 40 degrees C. It can be concluded from the present study that the digestibility and CH4 emission were affected by intensity of heat stress. Further studies are necessary with respect to ruminal microbial changes to justify the variation in the digestibility and CH4 emission during differential heat stress.
机译：进行本实验以评估模拟热应力对消化率和甲烷（CH4）排放的影响。从10:00小时到15:00小时，将4只非哺乳杂种牛在气候室内暴露于25°C，30°C，35°C和40°C的温度下，相对湿度为40％至50％每天27天。每天15:00记录生理反应。在第1、6、11、16和21天的15:00时采集血样，并收集血清进行生化分析。 21天后，连续六天收集粪便和饲料样品以评估消化率。在过去的48小时内，不断收集气体样本以估算CH4排放量。从直肠温度，呼吸频率，脉搏频率，摄水量和血清甲状腺素水平的变化（p <0.05）可以明显看出实验动物在35摄氏度和40摄氏度下的热应激。 40°C暴露于温度下后，血清乳酸脱氢酶，天冬氨酸转氨酶，丙氨酸转氨酶，碱性磷酸酶活性和蛋白质，尿素，肌酐和甘油三酸酯浓度发生了变化（p <0.05），动物的体重下降了（p <0.05）。在40摄氏度暴露下，干物质摄入量（DMI）较低（p <0.05）。与25摄氏度和30摄氏度的暴露相比，在35摄氏度时干物质和中性洗涤剂纤维的消化率更高（p <0.05），而在35摄氏度时有机物质（OM）和酸性洗涤剂纤维的消化率更高（p <0.05）摄氏度要高于40摄氏度的热暴露。 CH4排放量/ kg DMI和有机物摄入量（OMI）随着暴露温度的升高而降低（p <0.05），并在40摄氏度时达到最低水平。从本研究可以得出结论，消化率和CH4排放量受到影响通过热应力的强度。关于瘤胃微生物变化的进一步研究是必要的，以证明在不同的热应激期间消化率和CH4排放的变化是合理的。

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