| Autor: |
TH Rudder, Brian M. Burns, CJ Howitt, RJ Webber, TJ Tierney, Peter O'Rourke |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Australian Journal of Experimental Agriculture. 32:1011 |
| ISSN: |
0816-1089 |
| DOI: |
10.1071/ea9921011 |
| Popis: |
Liveweight and age at first and second oestrus of Hereford, highgrade Simmental, and Belmont Red heifers were measured over 4 cohorts born from 1979 to 1982. Heifers were observed for standing oestrus or chin-ball markings by vasectomised bulls from about 7 months of age (May) to about 26 months (December). During this period they grazed predominantly improved pastures growing on cleared brigalow country in a subtropical environment. Hereford heifers demonstrated first and second oestrus at lower (P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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