Autor: |
Holloway, J. W., Butts, W. T., McCurley, J. R., Beaver, E. E., Peeler, H. L., Backus, W. L. |
Zdroj: |
Journal of Animal Science; December 1985, Vol. 61 Issue: 6 p1354-1363, 10p |
Abstrakt: |
Female weight, fatness, milk production and calf growth were measured to determine seasonal patterns for 120 Angus, Hereford, Angus × Hereford and Hereford × Angus 2-yr-old females grazing fescue or 60% fescue-40% legume. Females calved January through March and calves were weaned in October in each of the 3 yr of the experiment. Preliminary analyses indicated that Angus × Hereford and Hereford × Angus females responded in a similar manner for all variables measured. Angus-Hereford females responded to increased nutrient supply provided by fescue-legume pasture (as compared with fescue) by increasing (P<.05) fatness, especially during late spring, and, to a lesser degree, by increasing (P<.05) milk production and calf growth. Hereford and Angus females, however, responded by increasing (P<.05) milk production (especially during mid-lactation) and calf growth and, to a lesser degree, by increasing (P>.05) fatness. These differential responses resulted in large differences in heterosis for the two pasture types. Calculated heterosis values were relatively large for average female weight and fatness of females grazing fescue-legume, and for weaning weight for those grazing fescue. |
Databáze: |
Supplemental Index |
Externí odkaz: |
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