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Digestible, Metabolizable and Net Energy Values of Pea Scalping and Wheat Straw in Lambs^{1 ,2,}

Washington State University³, Pullman 99164

Abstract

Metabolic and growth studies were conducted with wether and ewe lambs to determine nutrient digestibility, digestible energy (DE), metabolizable energy (ME), and net energy for maintenance and production (NEm + p) of pea scalpings (i.e., chaff, pea pods, pea hulls, split peas, weed seeds and dirt) and wheat straw. Four pelleted diets consisting of varying proportions (20, 80%; 40, 60%; 60, 40%; an; 80, 20%) of pea scalpings and wheat straw, respectively, were used. Dry matter, CP, EE and NFE digestibilities as well as TDN increased as the percent of pea scalpings increased in the diet. Crude fiber digestibility was not influenced by the various levels of each ingredient in the diet. DE and ME increased as the percentage of pea scalpings increased in the diet; however, there were no differences in the DE and ME values of the 40 and 60% pea scalpings diets. There were no differences in NEm+p among the various rations. The mean DE, ME and NEm+p values, in kcal/g, for pea scalpings and wheat straw were 2.85, 2.58, 1.15, and 1.65, 1.42, .82, respectively. Live-weight and energy gain increased as the percent pea scalpings increased in the diet as a result of increased dietary intake. Ration or sex had no significant effect on the percent of carcass fat or protein.

¹ Scientific Paper No. 4079. College of Agriculture Research Center, Washington State University, Pullman. Projects 0218 and 1488.

² Appreciation is extended to Whitman County Grain Growers Association for partial support of this work.

³ Department of Animal Sciences.