Milk production and blood metabolites of dairy cattle as influenced by thermal-humidity index

Kekana Thapelo W.; Nherera-Chokuda Florence V.; Muya Mukengela C.; Manyama Kabelo M.; Lehloenya Khoboso C.

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Milk production and blood metabolites of dairy cattle as influenced by thermal-humidity index

机译：热湿度指数的影响，奶牛的牛奶生产和血液代谢物

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The effects of high thermal stress on serum protein metabolites, milk production of transition dairy cows in semi-arid areas in South Africa were evaluated. Forty, +/- 8 months pregnant, Jersey heifers (+/- 26 months) in zero grazing management were selected during summer from two semi-arid communal areas. Summer thermal-humidity index (THI) of the areas were THI-1 (72-83: extreme caution) and THI-2 (75-87: danger). Blood samples were collected (21 days pre-partum, and 21 and 75 days post-partum) and analysed for serum protein metabolites. Milk yield was recorded daily and samples collected for milk fat, protein, lactose and urea nitrogen analysis. Heifers in THI-2 had lower (P & 0.05) total serum proteins, albumin and blood urea nitrogen than THI-1. Post-calving, cows in THI-1 had higher (P & 0.05) TP (73.4 vs 67.9 g/l) and BUN (4.61 vs 3.77 mmol/l) at 21 DIM, and lower (P creatinine at 21 and 75 DIM than THI-2 group. Milk yield, fat and protein in THI-2 were all lower (P & 0.05) than THI-1 21DIM. The results confirm that heat stress affects utilisation of nutrients in transition dairy cows.

机译：评估了高热应力对南非半干旱地区过渡乳制品奶牛奶牛产量的高热应激。在夏季，从两个半干旱的公共区域选择了40名+/- 8个月的Zero Preifers（+/- 26个月）。地区的夏季热湿度指数（THI）是THI-1（72-83：极端小心）和THI-2（75-87：危险）。收集血液样品（预粒度预粒度，21天和产后21天和75天），并分析血清蛋白代谢物。每天记录乳屈服，并为牛奶脂肪，蛋白质，乳糖和尿素氮分析收集样品。 Thi-2中的小母牛具有较低（P＆amp; 0.05）总血清蛋白，白蛋白和血尿尿素氮而不是THI-1。产犊后，TH1-1的奶牛（P＆amp; 0.05）TP（73.4 vs 67.9 g / L），21个暗集，低于21次，下降（P肌酐） 75昏暗而不是thi-2组。牛奶产率，脂肪和蛋白质在第2℃下均低（P＆amp; 0.05），而不是thi-1 21dim。结果证实热应力影响过渡乳制奶牛中营养素的利用。

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《Tropical Animal Health and Production》 |2018年第4期|共4页
作者
Kekana Thapelo W.; Nherera-Chokuda Florence V.; Muya Mukengela C.; Manyama Kabelo M.; Lehloenya Khoboso C.;
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作者单位

Agricltural Res Council Livestock Nutr Unit P Bax X 02 ZA-0062 Irene South Africa;

Agricltural Res Council Livestock Nutr Unit P Bax X 02 ZA-0062 Irene South Africa;

Agricltural Res Council Livestock Nutr Unit P Bax X 02 ZA-0062 Irene South Africa;

Agricltural Res Council Livestock Nutr Unit P Bax X 02 ZA-0062 Irene South Africa;

Univ Zululand Fac Sci &

Agr ZA-3886 Kwa Dlangezwa South Africa;

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原文格式 PDF
正文语种 eng
中图分类畜牧、动物医学、狩猎、蚕、蜂;
关键词
Blood proteins; Milk production; Smallholder dairy cows;

机译：血液蛋白;牛奶生产;小啤酒奶牛;

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Milk production and blood metabolites of dairy cattle as influenced by thermal-humidity index

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