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Digestible, Metabolizable and Net Energy Values of Corn Grain and Dehydrated Alfalfa in Sheep^{1, 2,}

New Mexico State University, Las Cruces 88003

Abstract

The digestible energy (DE), metabolizable energy (ME) and net energy for maintenance and production (NE_m+p) values of dehydrated alfalfa and corn were determined in a metabolic and energy retention study with lambs. Twenty-one diets consisting of varying proportions (5% increments from 0% to 100% for each ingredient) of dehydrated alfalfa and corn were used. Crude protein, ether extract and nitrogen-free extract digestibility curvilinearly increased, and crude fiber curvilinearly decreased with increased levels of corn in the ration. There were no interactional (non-linear, non-additive, curvilinear or associative) effects for DE, ME and NE_m+p values with the various ratios of concentrate to roughage. A linear relationship between energy (DE, ME and NE_m+p) and ration composition indicated that the energy values of corn and dehydrated alfalfa were additive and that no interactional effects were evident with the change in ration composition. The caloric value (DE, ME and NE_m+p) of the diet increased with increased levels of corn in the diet; and likewise, energy retention increased with increased levels of corn in the diet.

¹ Journal Article 426, Agriculture Experiment Station, New Mexico State University, Las Cruces 88003.

² This investigation was partially supported by a grant from the American Dehydrators Association.

³ Department of Animal Sciences, Washington State University, Pullman 99163.

⁴ Department of Physiology, Biochemistry and Pharmacology, New York State Veterinary College, Cornell University, Ithaca 14850.

⁵ Department of Animal Sciences, New Mexico State University, Las Cruces 88003.