Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 66, Issue 26, Pages 6926-6935Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.8b01794
Keywords
metabolomics; gas chromatography-mass spectrometry; heat stress; beef cattle; metabolic pathway
Funding
- National Key Research and Development Program of China [2017YFD0502005]
- Sichuan Science and Technology Program [2018NZ0002]
- China Agriculture (Beef Cattle/Yak) Research System [CARS-37]
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This study was to determine differences in the global metabolic profiles of serum and urine of Xuanhan yellow cattle, Simmental crossbred cattle (Simmental X Xuanhan yellow cattle), and cattle-yaks (Jersey X Maiwa yak) under heat stress (temperature-humidity index remained above 80 for 1 week). A total of 55 different metabolites associated with the three breeds were identified in the serum and urine samples by gas chromatography-mass spectrometry. The metabolic adaptations to heat stress are heterogeneous. Cattle-yaks mobilize a greater amount of body protein to release glucogenic amino acids to supply energy, whereas the tricarboxylic acid cycle is inhibited. Simmental crossbred cattle mobilize a greater amount of body fat to use free fatty acids as an energy source. In comparison with Simmental crossbred cattle and cattle-yaks, Xuanhan yellow cattle have higher glycolytic activity and possess a stronger antioxidant defense system and are, in conclusion, more adapted to hot and humid environments.
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