| Autor: |
T.C. Bramble, G.A. Nunnery, L.D. Rea, K.F. Wilson, C. R. Richardson, T.C. Wedegaertner, G.A. Holt |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
The Professional Animal Scientist. 19:404-409 |
| ISSN: |
1080-7446 |
| DOI: |
10.15232/s1080-7446(15)31454-6 |
| Popis: |
A growing experiment with crossbred beef heifers was conducted in the spring of 2002 to determine the effects of diets containing either ground or extruded (COBY process) cotton gin by-products (CBP) on feed intake and performance. Two basal diets with ground or COBY-processed CBP were compared with and without a feed-grade enzyme additive, a slow-release urea product, or both. Diets were completely mixed and consisted of approximately 70% concentrate and 30% CBP. Heifers were fed the diets for 42 d; feed intake and BW gain were measured at each of two 21-d intervals. One hundred sixty-eight crossbred heifers from one source and of known breeding were randomly assigned to seven treatments. Heifers were weighed at d 0 (initial BW = 289.8 ± 13.2 kg) and were subsequently implanted on d 21. Four pens of six heifers were used per treatment, and pen was the experimental unit. Treatments were 1) ground CBP; 2) ground CBP + feed-grade enzyme; 3) ground CBP + slow-release urea; 4) COBY-processed CBP; 5) COBY-pro-cessed CBP + feed-grade enzyme; 6) COBY-processed + slow-release urea; and 7) COBY-processed CBP + feed-grade enzyme + slow-release urea. The DMI of heifers on Treatments 1 and 2 were greater (P |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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