Effects of Whole Cottonseed or Niacin or Both on Casein Synthesis by Lactating Holstein Cows
| Autor: | J.K. Lanham, K.N. Brooks, D.L. Wilks, J.L. Horner, C.E. Coppock |
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| Rok vydání: | 1992 |
| Předmět: |
Blood Glucose
Dietary Fiber medicine.medical_specialty Cottonseed Oil Animal feed medicine.medical_treatment Biology Niacin Cottonseed Eating Random Allocation Animal science Hot weather Internal medicine Casein Lactation Genetics medicine Animals Insulin Amino Acids Milk protein Caseins food and beverages Milk Proteins Animal Feed Lipids Milk medicine.anatomical_structure Endocrinology Cattle Female Animal Science and Zoology Dietary Proteins Food Science |
| Zdroj: | Journal of Dairy Science. 75:184-192 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.s0022-0302(92)77752-2 |
| Popis: | Forty Holstein cows in late lactation were offered diets containing niacin and whole cottonseed: 1) 0 g/d, 0%; 2) 0 g/d, 15%; 3) 6 g/d, 0%; and 4) 6 g/d, 15%, to evaluate effects on milk casein synthesis. Cows fed diet 1 had the highest DMI. The FCM (21.4 vs. 18.7 kg/d) and milk fat percentage (4.08 vs. 3.81) were higher for cows fed diet 1 than for those fed diet 4. Milk protein percentage (3.61 vs. 3.50) was higher for cows fed diet 1 than for those fed diet 2. Casein N, as a percentage of total N, was higher (71.9 vs. 68.0%) in milk from cows fed diet 1 than those fed diet 3. Insulin tended to be elevated in cows on the diets containing niacin, but glucose was not affected. Plasma niacin was elevated in cows on the diets supplemented with niacin compared with diet 1. Plasma AA were changed only slightly by treatments. The beneficial effect of niacin on milk casein synthesis, noted in our earlier work when cows were fed whole cottonseed, was not evident in this study with cows in late lactation and during hot weather. |
| Databáze: | OpenAIRE |
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