| Autor: |
A. C. Hammond, C. E. Crosby, K. H. Ramsay, H.W. Essig, P. C. Genho, S. A. Moore, J.H. Harris, W.E. Kunkle, E. J. Bowers |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
The Professional Animal Scientist. 10:24-31 |
| ISSN: |
1080-7446 |
| DOI: |
10.15232/s1080-7446(15)31923-9 |
| Popis: |
Measurement of blood urea nitrogen (BUN) may be useful as a tool for making real-time adjustments in protein supplementation for grazing or wintering beef cattle. The objective of our research was to test this approach by comparing performance of cows wintered using a predetermined standard supplementation program with cows wintered under similar conditions but where level and timing of protein supplementation was guided by monitoring BUN concentrations. Two herds on each of five production units at Deseret Ranches of Florida (110 to 210 pregnant cows per herd), assigned to either standard (CO) or BUN-guided (BG) winter supplementation treatments, with 25 cows selected from each of the 10 herds for monitoring BUN concentration. The CO treatment consisted of feeding a cottonseed meal-based cube (33% CP) and molasses according to standard ranch protocol. The BG treatment was the same, except that time and amount of cube feeding was guided by results of BUN analyses. Cube feeding was increased when a herd sample mean BUN reached |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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