Role of methionine as a methyl group donor in cattle

dc.citation.epage116en_US
dc.citation.spage114en_US
dc.contributor.authorLöest, C.A.
dc.contributor.authorGreenwood, R.H.
dc.contributor.authorTitgemeyer, Evan C.
dc.contributor.authoreidetitgemeen_US
dc.date1999en
dc.date.accessioned2010-08-23T20:06:30Z
dc.date.available2010-08-23T20:06:30Z
dc.date.issued2010-08-23T20:06:30Z
dc.date.published1999en_US
dc.description.abstractHolstein steers were used in two 5 × 5 Latin square experiments to evaluate the sparing of methionine by alternative sources of methyl groups (betaine or choline). Steers were housed in metabolism crates and limit fed a diet high in rumen degradable protein. To increase energy supply, volatile fatty acids were infused into the rumens, and glucose was infused into the abomasum. An amino acid mixture, limiting in methionine, was infused abomasally to ensure that non-sulfur amino acids did not limit protein synthesis. Treatments for Exp. 1 were abomasal infusion of 1) water (control), 2) 2 g/day additional L-methionine, 3) 1.7 g/day Lcysteine, 4) 1.6 g/day betaine, and 5) 1.7 g/day L-cysteine + 1.6 g/day betaine. Treatments for Exp. 2 were abomasal infusion of 1) water (control), 2) 2 g/day additional L-methionine, 3) 8 g/day betaine, 4) 16 g/day betaine, and 5) 8 g/day choline. In both experiments, nitrogen retention increased (P<.05) in response to methionine, demonstrating a deficiency of sulfur amino acids. Responses to cysteine, betaine and choline were small. The low response to cysteine indicates that either the response to methionine is not due to transsulfuration to cysteine, or that cysteine supply does not alter the flux of methionine through transsulfuration. The small responses to betaine and choline suggest that they do not substitute for methionine. Thus, under our experimental conditions, responses to methionine likely were due to a correction of a deficiency of methionine per se rather than of methyl group donors.en_US
dc.description.conferenceCattlemen's Day, 1999, Kansas State University, Manhattan, KS, March 5, 1999en_US
dc.identifier.urihttp://hdl.handle.net/2097/4729
dc.publisherKansas State University. Agricultural Experiment Station and Cooperative Extension Serviceen_US
dc.relation.isPartOfCattlemen’s Day, 1999en_US
dc.relation.isPartOfKansas Agricultural Experiment Station contribution; no. 99-339-Sen_US
dc.relation.isPartOfReport of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 831en_US
dc.subjectBeefen_US
dc.subjectMethionineen_US
dc.subjectCysteineen_US
dc.subjectBetaineen_US
dc.subjectCholineen_US
dc.subjectSteersen_US
dc.titleRole of methionine as a methyl group donor in cattleen_US
dc.typeConference paperen_US

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
cattle99pg114-116.pdf
Size:
19.78 KB
Format:
Adobe Portable Document Format

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.69 KB
Format:
Item-specific license agreed upon to submission
Description: