| Autor: |
Bunting, L. D., Sticker, L. S., Wozniak, P. J. |
| Zdroj: |
Journal of Animal Science; May 1992, Vol. 70 Issue: 5 p1518-1525, 8p |
| Abstrakt: |
Eight wether lambs (x̄ BW = 28.8 kg) with ruminal and abomasal cannulas were assigned to either thermally neutral or high ambient temperature treatments. Within each temperature, lambs were randomly allotted to dietary treatments consisting of a basal diet (60% corn and 24% cottonseed hulls) either with (high; 11.4% CP) or without (control; 10.1% CP) added ruminal escape CP as fish meal and with (high) or without (control) 5% added ruminally inert fat in a 2 × 2 factorial treatment arrangement using a Latin square design. Lambs were fed 606 g of DM/ d in each period, which consisted of a 10-d adjustment followed by 6 d of sample collection. High temperature increased (P< .05) respiration rate, evaporative water loss, and rectal temperature. When compared with controls, lambs fed high escape CP retained more N when exposed to high temperatures (2.8 vs 3.6 g of N/d) and less N at neutral temperatures (3.3 vs 3.1 g of N/d; temperature × escape CP; P< .05). Retention of N was greater (P< .05) in lambs fed high than in those fed control fat (3.8 vs 2.7 g/d). Lambs fed high vs control escape CP had greater abomasal feed N flow (percentage of intake) when fed high-fat diets (77.3 vs 56.1%) but similar dietary N flow when fed control fat diets (55.8 vs 54.3%; fat × escape CP; P< .05).(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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