| Autor: |
Du Preez JH; Onderstepoort Veterinary Institute, South Africa., Willemse JJ, Van Ark H |
| Jazyk: |
angličtina |
| Zdroj: |
The Onderstepoort journal of veterinary research [Onderstepoort J Vet Res] 1994 Mar; Vol. 61 (1), pp. 1-6. |
| Abstrakt: |
Regression models are proposed for predicting conception rate in a dairy herd under South African and especially Natal conditions. Conception rate (CR%) was related to mean monthly temperature-humidity index (THI) by curvilinear regression equation model; CR% = 812.7 +/- 28.61 THI - 0.2322THI2 (P = 0.061), and by linear regression equation model; CR% = 188.0 - 1.906THI (P = 0.023). Conception rate was related to numerical month of the year (M) by: CR% = 44.34 + 6.168M - 0.428M2 (P = 0.106). Further investigations to test the proposed regression models under various dairy-herd conditions and to improve reproduction in South African dairy herds are needed. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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