Effect of Abomasal Infusion of Sodium Caseinate on Milk Yield, Nitrogen Utilization and Amino Acid Nutrition of the Dairy Cow
| Autor: | J.H. Clark, R. G. Derrig, C. L. Davis |
|---|---|
| Rok vydání: | 1974 |
| Předmět: |
Blood Glucose
Rumen Nitrogen Metabolite Medicine (miscellaneous) Phenylalanine Abomasum chemistry.chemical_compound Mammary Glands Animal Pregnancy Casein Lactation medicine Animals Urea Food science Amino Acids Intubation Gastrointestinal chemistry.chemical_classification Nutrition and Dietetics Methionine Sodium Caseins food and beverages Milk Proteins Amino acid Milk medicine.anatomical_structure chemistry Animal Nutritional Physiological Phenomena Cattle Female Amino Acids Essential Dietary Proteins |
| Zdroj: | The Journal of Nutrition. 104:151-159 |
| ISSN: | 0022-3166 |
| Popis: | Previous studies have not established the sequence of limiting amino acids for the lactating cow or the mode of response from postruminal casein administra tion. Therefore, an evaluation of metabolite uptake by the lactating bovine mammary gland has been used to suggest a possible sequence of limiting amino acids for milk protein synthesis. Seven lactating Holstein cows were used to study the effect of abomasal versus ruminai infusion of sodium caseinate on milk production, milk compo sition, nitrogen utilization, levels of various blood metabolites and metabolite uptake by the mammary gland. Milk yield, milk nitrogen and nitrogen retained were significantly increased and fecal and urinary nitrogen were significantly decreased when sodium caseinate was infused postruminally. A general increase in the jugular blood con centration of all essential amino acids and most of the nonessential amino acids was observed when sodium caseinate was infused into the abomasum. The estimated up take of each amino acid from the blood and the theoretical quantity of milk protein which could be synthesized by the mammary gland suggest phenylalanine, methionine, lysine, threonine, etc., to be the sequence of limiting essential amino acids for the lactating dairy cow. J. Nutr. 104: 151-159, 1974. INDEXING |
| Databáze: | OpenAIRE |
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