Effects of fat coated rumen bypass lysine and methionine on performance of dairy cows fed a diet deficient in lysine and methionine

Autor:	Hiroyuki Sato, P.H. Robinson, H. Suzuki, William Chalupa, Yoshiaki Obara, Kazuo Katoh, Alan H. Fredeen, William E. Julien, Kazumasa Watanabe
Rok vydání:	2006
Předmět:	Methionine Milk protein Chemistry Lysine food and beverages General Medicine chemistry.chemical_compound Rumen Neutral Detergent Fiber medicine.anatomical_structure Lactation medicine Dry matter Food science General Agricultural and Biological Sciences Feces
Zdroj:	Animal Science Journal. 77:495-502
ISSN:	1740-0929 1344-3941
DOI:	10.1111/j.1740-0929.2006.00377.x
Popis:	Two experiments were conducted to evaluate the effect of fat coated rumen bypass lysine (RPLys) and methionine (RPMet) on the lactation performance of dairy cows. In Experiment 1, three lactating cows were supplied with RPLys and fat coated DL-Met which was highly protected (H-RPMet) as an indigestible marker, and total fecal emission was collected for 72 h following administration. Measuring the proportional difference in fecal excretion of lysine derived from RPLys relative to methionine derived from H-RPMet, the intestinal availability of RPLys was estimated to be 66.2%. In Experiment 2, 20 multiparous Holstein cows producing approximately 40 kg/day of milk were assigned to two treatments; fed RPLys (16 g/day as lysine) and RPMet (6.5 g/day as methionine) or none (control) from 5 to 21 weeks postpartum. The consumption of dry matter, organic matter, crude protein, neutral detergent fiber and acid detergent fiber were significantly more in the control cows throughout the experimental period. Their milk protein yield, the contents of their milk protein and milk fat were higher by 0.03 kg (P = 0.03), 0.06% (P
Databáze:	OpenAIRE
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