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

Kazumasa Watanabe, Alan H. Fredeen, Peter H. Robinson, William Chalupa, William E. Julien, Hiroyuki Sato, Hiroyuki Suzuki, Kazuo Katoh, Yoshiaki Obara

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    8 Citations (Scopus)

    Abstract

    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 < 0.001) and 0.11% (P = 0.07), respectively, in the treatment group compared to the control. These results suggest that the RPLys and RPMet used in this study improved the lactation performance of dairy cows.

    Original languageEnglish
    Pages (from-to)495-502
    Number of pages8
    JournalAnimal Science Journal
    Volume77
    Issue number5
    DOIs
    Publication statusPublished - 2006 Oct 1

    Keywords

    • Lactating cows
    • Milk protein
    • Rumen protected amino acids

    ASJC Scopus subject areas

    • Agricultural and Biological Sciences(all)

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  • Cite this

    Watanabe, K., Fredeen, A. H., Robinson, P. H., Chalupa, W., Julien, W. E., Sato, H., Suzuki, H., Katoh, K., & Obara, Y. (2006). Effects of fat coated rumen bypass lysine and methionine on performance of dairy cows fed a diet deficient in lysine and methionine. Animal Science Journal, 77(5), 495-502. https://doi.org/10.1111/j.1740-0929.2006.00377.x