Premium
Effect of glycine and vitamin supplementation on sulphur amino acid utilization by growing cattle
Author(s) -
Lambert B. D.,
Titgemeyer E. C.,
Löest C. A.,
Johnson D. E.
Publication year - 2004
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/j.1439-0396.2004.00484.x
Subject(s) - methionine , glycine , vitamin , limiting , factorial experiment , amino acid , cysteine , chemistry , zoology , medicine , food science , biochemistry , biology , enzyme , mechanical engineering , statistics , mathematics , engineering
Summary Effects of glycine (Gly) and B‐vitamins on sulphur amino acid (AA) utilization were studied in growing steers maintained under conditions where methionine (Met) was first limiting. Conditions were generated by limit feeding a diet low in ruminally non‐degraded protein and abomasally infusing an AA mixture limiting in Met. Retained N tended (p = 0.07) to improve when steers received 10 mg folate, 10 mg vitamin B 6 , and 0.10 mg vitamin B 12 daily. Hepatic vitamin B 12 (p = 0.08) and folate (p = 0.05) concentrations increased with vitamin supplementation. In another trial, factorial treatments were 2 or 5 g/day l ‐Met and 0 or 50 g/day Gly infused abomasally. Retained N increased (p < 0.05) in response to Met, and responses were numerically larger in the presence of supplemental Gly. In a different trial, factorial treatments were 0 or 2.4 g/day l ‐cysteine (Cys) and 0 or 40 g/day Gly. Retained N was not affected by Cys in the absence of Gly, but was increased by Cys when Gly was supplemented (interaction, p = 0.01). B‐vitamin status may affect sparing of Met by Cys. Supplemental Gly improved responses to supplemental Met and Cys.