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Mixtures of Corn Grain and Corn Silage, Nitrogen Source and Zeranol for Feeder Lambs¹

Kansas State University, Manhattan 66506

Abstract

Growth and digestion trials were conducted and rumen and blood samples were taken to compare four levels of corn silage (CS) and corn grain (G), with soybean meal (SBM) and urea used as sources of supplemental N. In the growth trial, zeranol implants were also evaluated. Four mixtures of CS to G were fed: all CS, 2/3 CS + 1/3 G, 1/3 CS + 2/3 G and all G. Lambs fed all CS gained the slowest and least efficiently (P<.05). Among SBM-supplemented lambs, 2/3 CS + 1/3 G and 1/3 CS + 2/3 G supported faster (P<.05) gains than did all G; however, gains for urea supplemented lambs fed 2/3 CS + 1/3 G, 1/3 CS + 2/3 G and all G were similar. Averaged across all levels of CS, lambs fed SBM gained faster and more efficiently than those fed urea (P<.05). Zeranol implanted lambs gained faster (P<.05) than nonimplanted lambs. Dry matter digestibility and N retention increased (P<.05) as the level of G in the diet increased. Apparent crude protein digestibility was highest (P<.05) for lambs fed all G and crude fiber digestibility was lowest (P<.05) for lambs fed 1/3 CS + 2/3 G. Lambs fed urea retained less N and had lower crude fiber digestibility coefficients than lambs fed SBM (P<.05). Sample time x level of CS interactions were significant for total volatile fatty acids, acetic and propionic acids and rumen NH₃. The time x N source interaction was also significant for rumen NH₃, with lambs fed urea having higher values at 1 h postfeeding than SBM-fed lambs. Plasma urea N decreased as the level of G in the diet increased and was higher in lambs fed urea than in those fed SBM.

¹ Contribution No. 81-107-j, Dept. of Anim. Sci. and Ind., Kansas Agr. Exp. Sta., Manhattan 66506.

² Present address: Farmland Ind., Inc., Dodge City, KS 67801.