Metabolizable energy value of feedstuffs for poultry and swine using the regression method

Olukayode A Bolarinwa, Purdue University

Abstract

The objectives of the studies in this thesis were to determine the ileal digestible energy (IDE), metabolizable energy (ME), and nitrogen corrected ME (MEn) of 2 meat and bone meal samples (MBM1 and MBM2), 2 samples of wheat distillers' dried grains with solubles (WDDGS1 and WDDGS 2), barley and wheat for broiler chickens, and to determine the digestible energy (DE), ME, and MEn of barley and wheat for growing pigs using the regression method. All broiler chicken experiments had a corn-soybean meal based reference diet (RD), and test diets were such that each of MBM, WDDGS, barley and wheat were added to the RD to partly replace the dietary energy sources in the RD, which were corn, SBM, corn starch and soy oil. The pig experiment used a corn-SBM RD but with corn and SBM as the energy sources. Barley and wheat were added to partly replace corn and SBM in the RD at 2 levels. There was a fourth diet in which barley and wheat was fed solely with added vitamins and minerals to the pigs. Broiler chickens at 14 d of age were fed for 7 d with chromic oxide used as an indigestible marker. The pig studies lasted 12 to 14 d and involved a 5-d adjustment period followed by a 5-d period of total but separate collection of feces and urine with the pigs housed in metabolic crates. The ME, MEn and IDE/DE of each test ingredient was determined by the slope of the regression of the test ingredient contribution to diet IDE/DE, ME or MEn intake in kcal against the test ingredient intake in grams. The IDE, ME, and MEn were 4,042, 3728, and 3,485, kcal/kgDM, and 3,447, 3,398, and 3,202 kcal/kg DM, for MBM1 and MBM2 respectively, and 3,871, 3,665, and 3,470, and 3,786, 3,594, and 3,369 kcal/kg respectively for WDDGS1 and WDDGS2 respectively. The IDE, ME, and MEn were 3,709, 3,665, and 3,535, and 3,892, 3,746, and 3,621 kcal/kg DM for barley and wheat, respectively in the broiler chicken experiment. The DE, ME, MEn obtained from the regression method were 3,879, 3,795, and 3,695 and 3,527, 3,451, and 3,353, kcal/kg DM for wheat and barley, respectively in pigs. For the pig studies, comparisons were made between the regression method and the direct method. The DE, ME, MEn of wheat obtained using the regression method were higher than the direct method, however in the case of barley, only the DE was higher using the regression method. The results of these studies show that MBM, WDDGS, barley and wheat are good sources of energy and can be included in the diets of broiler chickens and pigs to partly replace corn and soybean meal.

Degree

M.S.

Advisors

Adeola, Purdue University.

Subject Area

Animal sciences

COinS