The effects of ruminal escape protein or fat on nutritional status of pregnant winter-grazing beef cows
| Autor: | Kris M. Havstad, Petersen Mk, J. L. Miner, M. J. McInerney, R A Bellows |
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| Rok vydání: | 1990 |
| Předmět: |
Blood Glucose
Animal feed Soybean meal Nutritional Status Biology Random Allocation Rumen chemistry.chemical_compound Fodder Pregnancy Genetics Animals Birth Weight Food science Animal fat Body Weight Temperature food and beverages Blood Proteins General Medicine Blood meal Animal Feed Dietary Fats Cholesterol chemistry Creatinine Urea Pregnancy Animal Cattle Female Animal Science and Zoology Dietary Proteins Soybeans Corn gluten meal Food Science |
| Zdroj: | Journal of Animal Science. 68:1743 |
| ISSN: | 0021-8812 |
| DOI: | 10.2527/1990.6861743x |
| Popis: | This study was designed to determine the influence of soybean meal supplementation, with or without additional ruminal escape protein or fat, on the nutritional status of pregnant winter-grazing beef cows. During two winters (Trials 1 and 2), approximately 60 prepartum beef cows grazed native foothills range each year. Cows were allotted randomly to five groups and supplemented (g/d) with either none (control); 570 soybean meal (SOY); 450 soybean meal plus 230 blood meal (SOY + BM); 140 soybean meal, 16 urea plus 450 corn gluten meal (SOY + CGM); or 570 soybean meal plus 210 animal fat (SOY + FAT). These supplements were designed to supply similar quantities of ruminal degraded protein while varying in escape protein quantity and source (SOY + BM and SOY + CGM). Condition scores and body weights were determined at trial initiation (mid-December) and conclusion (early March). Eight blood samples obtained over 4 d during three periods (9, 4 and 1 wk prior to parturition) were analyzed for concentrations of glucose, urea nitrogen (N), total bilirubin, creatinine, albumin, total protein and cholesterol. Cows in the control treatment experienced the greatest BW loss in both trials. In Trial 2, escape protein tended to decrease (P less than .06) BW loss compared to SOY, though loss tended to be greater (P less than .08) with SOY + CGM than with SOY + BM. Escape protein can enhance nutritional status when supplemented with .6 kg/d of soybean meal. |
| Databáze: | OpenAIRE |
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