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Effect of Protein Source and Lasalocid on Nitrogen Digestibility and Growth by Ruminants^1,2,

University of Missouri³, Columbia 65211

Abstract

Protein supplements having either a high (soybean meal, SBM) or low (escape protein, EP) extent of ruminal N degradability with or without lasalocid (L) were evaluated in digestion and growth trials. The SBM supplement included soybean meal while EP was a combination of dehydrated alfalfa and distillers dried grains. Nitrogen digestibility of SBM supplements was consistently higher than EP supplements when evaluated with two lamb trials. Digestibility of N was improved 8% in trial one (64.9 vs 60.3%) and 27% in trial two (66.3 vs 52.3%) with SBM vs EP. The addition of L to the supplements improved N digestibility by 6% in trial one (64.5 vs 60.6%) and 13% in trial two (62.9 vs 55.7%). No interactions between protein source and L were measured in either trial. Dry matter digestibility was not changed by protein source or L in either trial. Rumen propionate was increased and acetate to propionate ratio decreased when L was fed. Plasma urea N was lower over a 24 h sampling period when lambs were fed EP supplements compared with SBM supplements (11.07 vs 16.44 mg/100 ml); however, L did not appear to consistently alter the values. When steers were supplemented with the same protein sources during a 105-d winter pasture trial daily gains were not affected (P<.10) by either protein source or L (.429, .495, .476 and .514 kg/d for SBM, SBM+L, EP and EP+L, respectively) although numerically there did not appear to be main effect improvements due to EP and L. For a 65-d lamb growth trial, lambs fed EP supplements gainde 35% faster (P<.05) than lambs fed SBM supplements (159.2 vs 103.3 g/d). The addition of L resulted in a significant interaction with lambs, while lambs fed SBM+L gained more slowly than lambs fed SBM.

¹ Journal Paper No. 9112 of the Missouri Agr. Exp. Sta.

² Supported in part by Hoffmann-LaRoche, Inc., Nutley, NJ 07110.

³ Dept. of Anim. Sci.

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