cow, methionine, urea, range grass, digestibility, intake
A 2-year grazing study involving 103 mature pregnant Simmental x Angus cows grazing dormant winter range was conducted to determine the effects of methionine addition to a urea-grain supplement on forage intake and digestibility and on cow performance. Four protein supplements designed to supply .8 1b crude protein per head daily were fed from mid-November to mid-February. Supplements contained (1) urea (CON), (2) urea plus methionine (MET), (3) urea plus sodium sulfate (SUL) and (4) soybean meal (SBM). Twice during the second winter (late November and late January), cows were administered controlled release chromic oxide boluses and fecal samples were collected to determine grass intake by the fecal output/indigestibility ratio technique. Organic matter intake (OMI) and digestibility (OMD) were higher in November than January. No differences in OM1 between supplemental treatments were detected. A treatment x grazing period interaction was detected for OMD. In late January and November, OMD was higher for cows fed SBM than cows fed supplements containing urea. In late January, OMD was lower for MET compared to SUL fed cows. Cows supplemented with MET gained less weight and body condition over each winter grazing period than SUL fed cows. Methionine addition to a urea-grain supplement did not improve digestibility or intake of range forage or cow weight gains.
Number of Pages
South Dakota State University
Copyright © 1991 South Dakota State University.
Momont, P. A.; Pruitt, R. J.; and Johnson, P. S., "Methionine Addition to a Urea-Grain Supplement for Cows Grazing Dormant Winter Range" (1991). South Dakota Beef Report, 1991. 8.