Effectiveness of the Australian breeding value for heat tolerance at discriminating responses of lactating Holstein cows to heat stress
| Autor: | L.M. Jensen, E.A. Jannaman, J.E. Pryce, A. De Vries, P.J. Hansen |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Dairy Science, Vol 105, Iss 9, Pp 7820-7828 (2022) |
| Druh dokumentu: | article |
| ISSN: | 0022-0302 99402394 |
| DOI: | 10.3168/jds.2021-21741 |
| Popis: | ABSTRACT: Heat stress has negative consequences for milk production and reproduction of dairy cattle. These adverse effects are likely to increase because of climate change and anticipated increases in milk yield. Some of the variation among cows in ability to resist effects of heat stress is genetic. The current objective of this observational study was to assess the effectiveness of the Australian breeding value for heat tolerance (ABVHT) based on the decline in milk yield with heat stress for predicting cow differences in effects of heat stress on regulation of body temperature, milk production, and reproductive function. Genomic breeding values for heat tolerance were calculated for 12,487 cows from a single California dairy farm. Rectal temperature in the afternoon (1100–2045 h) was measured on a subset of 626 lactating cows with ABVHT ≥102 (heat tolerant) or |
| Databáze: | Directory of Open Access Journals |
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