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Nutrient Digestibility in Diets Fed Steers in which Whole Cattle Blood was Substituted for Peanut Meal on a Protein Basis¹

University of Florida³, Gainesville 32611

Abstract

Whole cattle blood was substituted for peanut meal on a protein basis in feedlot cattle rations at levels of 0, 5, 10, 14 and 18% of whole fresh blood. Total digestible nutrients (TDN), metabolizable energy (ME) and the ratio of nitrogen retained/nitrogen absorbed were determined using steers in a 5 x 5 latin square designed experiment. The whole fresh blood was mixed with 2% of a 37% formaldehyde solution, kept at 4 C, and incorporated in the diet each day. The blood and peanut meal diets had equivalent TDN, ME, digested N retained and apparent absorption of sulfur, phosphorus and calcium. The digestibility of the crude protein of the blood was calculated to be 70.4 ± 7.5%.

¹ Published as Paper No. 510 Journal Series, University of Florida Agricultural Experiment Station, Gainesville.

² Present address: 10A Ave. S.E. No. 1601, Managua, Nicaragua.

³ Present address: 10A Ave. S.E. No. 1601, Managua, Nicaragua.