| Autor: |
Chalupa, William, Vecchiarelli, Bonnie, Galligan, David T., Ferguson, J.D., Baird, L.S., Hemken, R.W., Harmon, R.J., Soderholm, C.G., Otterby, D.E., Annexstad, R.J., Linn, J.G., Hansen, W.P., Ehle, F.R., Palmquist, D.L., Eggert, R.G. |
| Zdroj: |
Journal of Dairy Science; May 1996, Vol. 79 Issue: 5 p800-812, 13p |
| Abstrakt: |
Beginning at wk 5 of lactation, 136 cows (34 per treatment) were supplemented daily for 38 wk with 0, 10.3, 20.6, or 41.2mg of recombinantly derived bST monomer. Cows were obtained from University of Kentucky, University of Minnesota, University of Pennsylvania, and The Ohio State University. Nine cows (4 at 0 mg/d, 1 at 10.3 mg/d, 1 at 20.6 mg/d, and 3 at 41.2 mg/d) did not complete the experiment because of health problems. Data from these cows were included in the reproduction and health databases but not in the production database. Cows supplemented with bST produced more milk, consumed more feed, had lower rates of BW gain, and had improved efficiencies of milk production (conversion of feed and NELto milk). Additional increases in productivity were modest at 20.6 and 41.2 mg/d versus productivity at 10.3 mg/d of bST. Concentrations of fat, protein, and TS in milk were unaffected. At 10.3 mg/d, bST did not adversely affect reproduction or health. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
