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Effect of Readily Available Carbohydrate and Roughage Source on Performance of Lambs and Steers Fed a Liquid Supplement¹

North Carolina State University^,2, Raleigh 27650

Abstract

Two feeding experiments were conducted to evaluate the effect of readily available carbohydrate on performance of cattle and sheep fed low protein roughages and a liquid supplement. Exp. 1 consisted of two steer feeding trials to evaluate a basal diet (11.5% crude protein) consisting of 80% cottonseed hulls and 20% liquid supplement fed alone or supplemented with .454 kg per head daily of corn, wheat or roasted corn. The liquid supplement was a 32% crude protein supplement consisting primarily of cane molasses and urea. There were no differences (P>.05) among the cereal grain supplements in any of the performance, rumen or blood parameters studied. The basal diet promoted satisfactory growth and feed efficiency, and the results indicate that a low protein roughage, such as cottonseed hulls, may be fed successfully with a urea-based supplement. Exp. 2 consisted of two trials, each involving 30 individually fed lambs, to further evaluate the effect of various readily available carbohydrate sources on performance when low quality roughages were supplemented with a liquid supplement. Cornstarch, dextrose and roasted corn were fed at 5% of the diet with cottonseed hulls and liquid supplement or weathered fescue hay and liquid supplement in a 3 x 2 factorial arrangement of treatments. Similar performance, rumen volatile fatty acids (VFA) and blood urea nitrogen (BUN) values were observed for the various carbohydrate sources and there were no interactions (P>.05) observed between carbohydrate source and roughage source. Lamb fed cottonseed hull diets gained faster (P<.01), consumed more daily feed (P<.01) and had more favorable feed to gain ratios than those fed fescue hay diets.

¹ Paper No. 5957 of the Journal Series of the North Carolina Agr. Res. Service, Raleigh. The use of trade names in this publication does not imply endorsement by the North Carolina Agr. Res. Service of the products named, nor criticism of similar ones not mentioned.

² Dept. of Animal Science, North Carolina State Univ.

³ Dept. of Statistics, North Carolina State Univ.