Effect of ruminal escape protein and fat on nitrogen utilization in lambs exposed to elevated ambient temperatures
| Autor: | Sticker Ls, Wozniak Pj, L. D. Bunting |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Dietary Fiber
Male medicine.medical_specialty Hot Temperature Rumen Nitrogen Drinking chemistry.chemical_element Sheep Diseases Biology Cottonseed Eating Animal science Fish meal Latin square Stress Physiological Internal medicine Genetics medicine Animals Intestine Large Amino Acids Sheep Abomasum Respiration Rectal temperature General Medicine Animal Feed Dietary Fats Endocrinology chemistry Fermentation Animal Science and Zoology Digestion Sample collection Dietary Proteins Respiration rate Food Science Body Temperature Regulation |
| Zdroj: | Journal of animal science. 70(5) |
| ISSN: | 0021-8812 |
| Popis: | Eight wether lambs (mean 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 x 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 less than .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 x escape CP; P less than .05). Retention of N was greater (P less than .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 x escape CP; P less than .05).(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
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