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Methionine hydroxy analog supplementation for growing cattle and omasal sampling escape protein technique
Abstract
Efficiency of methionine hydroxy analog as a source of metabolizable methionine was examined in a growing and a grazing trial. In the growing trial, a basal diet of 44% corncobs and 44% sorghum silage (Sorhum bicolar (L.)) with 12% supplement (DM basis) was fed individually to yearling crossbred steers. Steers were supplemented with urea, meat and bone meal (MBM), and MBM plus methionine hydroxy analog (MHA). Methionine hydroxy analog was added to MBM at gradually increasing levels up to 17 g/d/head. The grazing trial was conducted with yearling steers grazing smooth bromegrass (Brontus inermis Leyss.) from May 8 to August 1, 1997. Steers were individually supplemented daily with energy control, energy control + gradually increased MHA, and SoyPass (escape protein source) + MHA. Supplementing with MHA did not improve gains of steers in either trial. Methionine hydroxy analog did not affect feed intake in the growing trial, but supplement consumption was decreased at 17 g/d level in the grazing trial. Blood plasma methionine levels of treatments were not effected by MHA. Increased levels of MHA up to 17 g/d/head failed to provide an adequate level of metabolizable methionine in both trials. Three experiments were conducted with ruminally cannulated steers to evaluate neutral detergent insoluble protein (NDIP) content of omasal samples as an escape protein estimation technique. In experiment 1, smooth brome hay escape protein (EP) values were determined with the NDIP technique and omasal sampling purine technique (OSPT). The escape protein values were not different as measured by these two techniques. In experiment 2, smooth bromegrass EP values were estimated in June and August, 1996. In situ and OSPT estimated similar EP values, but EP estimates from NDIP were lower. Experiment 3 was conducted from May through July, 1997. Omasal sampling purine technique estimated the highest EP values. In experiments 2 and 3, NDIP had better correlation with OSPT than with the in situ technique. Coefficients of variation of OSPT were higher than for NDIP. Escape protein content of forages can be estimated more precisely by NDIP.
Subject Area
Livestock|Anatomy & physiology|Animals
Recommended Citation
Can, Abdullah, "Methionine hydroxy analog supplementation for growing cattle and omasal sampling escape protein technique" (1998). ETD collection for University of Nebraska-Lincoln. AAI9908465.
https://digitalcommons.unl.edu/dissertations/AAI9908465