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Milk production and blood metabolites of dairy cattle as influenced by thermal-humidity index |
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| Authors: | Kekana Thapelo W. Nherera-Chokuda Florence V. Muya Mukengela C. Manyama Kabelo M. Lehloenya Khoboso C. |
| Affiliation: | 1.Livestock Nutrition Unit, Agricltural Research Council, P. Bag x 02, Irene, 0062, South Africa ;2.Faculty of Science and Agriculture, University of Zululand, KwaDlangezwa, 3886, South Africa ; |
| Abstract: | 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?P?P? |
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