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Heat stress affects mammary metabolism by influencing the plasma flow to the glands

JOURNAL OF ANIMAL SCIENCE AND BIOTECHNOLOGY 2024年第1期15卷 1-10页

作者： Zeng, Jia Wang, Diming Sun, Huizeng Liu, Hongyun Zhao, Feng-Qi Liu, Jianxin Zhejiang Univ Inst Dairy Sci Coll Anim Sci Hangzhou Peoples R China Zhejiang Univ Zhejiang Key Lab Dairy Cow Genet Improvement & Mil Hangzhou Peoples R China Univ Vermont Dept Anim & Vet Sci Burlington VT USA

Background Environmental heat stress (HS) can have detrimental effects on milk production by compromising the mammary function. Mammary plasma flow (MPF) plays a crucial role in nutrient supply and uptake in the mammary gland. In this experiment, we investigated the physiological and metabolic changes in high-yielding cows exposed to different degrees of HS: no HS with thermal-humidity index (THI) below 68 (No-HS), mild HS (Mild-HS, 68 utilization. Results Compared with No-HS, the MPF of dairy cows was greater (P < 0.01) under Mild-HS, but was lower (P < 0.01) in cows under Mod-HS. Oxygen supply and consumption exhibited similar changes to the MPF under different HS, with no difference in ratio of oxygen consumption to supply (P = 0.46). The mammary arterio-vein differences in glucose concentration were lower (P < 0.05) under Mild- and Mod-HS than under no HS. Glucose supply and flow were significantly increased (P < 0.01) under Mild-HS but significantly decreased (P < 0.01) under Mod-HS compared to No-HS. Glucose uptake (P < 0.01) and clearance rates (P < 0.01) were significantly reduced under Mod-HS compared to those under No-HS and Mild-HS. Under Mild-HS, there was a significant decrease (P < 0.01) in the ratio of lactose yield to mammary glucose supply compared to that under No-HS and Mod-HS, with no difference (P = 0.53) in the ratio of lactose yield to uptaken glucose among different HS situations. Conclusions Degrees of HS exert different influences on mammary metabolism, mainly by altering MPF in dairy cows. The output from this study may help us to develop strategies to mitigate the impact of different degrees of HS on milk production.

关键词： Dairy cow Heat stress Mammary metabolism Mammary plasma flow amino-acid utilization BLOOD-FLOW DAIRY-COWS MILK-PRODUCTION GLUCOSE INSULIN LACTATION TRANSPORT SYSTEMS

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