Digestible and Metabolizable Energy Values of Some Feeds for the Growing Pig

Abstract

Sigestible energy (DE), metabolizable energy based on a regression equation, the ME values (ME) and metabolizable energy corrected i6 for swine feeds can be ietermined most effeclitroge,n e-quilibrium (ME") wiie determined tively by multiplying DE X 0.98). This pro. for eight.feeds. Efiects of protein level in the videi a hetaboiiiable energy value applicible basal ration and of level-of feeding certain within the protein levels-used in plactical test feeds were also studied. Protein level of swine produition. ME values thus-derived the test ration was found to be inversely cor-were: soybean meal 3620, rapeseed meal related with the ratio ME/DE 1r ---O.9SO; 328O, heriing fishmeal 4550,-wheit 3965, bar-4 < 0.01)' It was postulated that conven-ley 3175, oats 2900 and wheat shorts 3040 tional methods for estimating ME and ME" kial/kg dry matter.underestimate high protein feeds and that,

Evaluation of collection method and diet effects on apparent digestibility and energy values of swine diets1

“…May and Bell (1971) conducted an experiment in which different CP concentrations of basal diets were used to determine digestibility of fishmeal at inclusion levels of 25% and 50% and wheat at 50%. Only numerical differences were observed in digestibility of GE and CP for both ingredients using different basal diets, as well as DE and ME of wheat.…”

Comparação do valor nutritivo de farinhas de sangue e de farinhas de vísceras para suínos utilizando-se o método da proteína e gordura digestíveis e o método de substituição

“…Os valores de EM são influenciados pelo nível de inclusão do alimento protéico na dieta, pelo consumo e pela qualidade da proteína do alimento (May & Bell, 1971). Segundo esses autores, quando a proteína é fornecida em excesso ou quando é de baixa qualidade, o nitrogênio urinário, associado à desaminação da proteína digestível absorvida em excesso, acarreta redução da EM.…”

Energy evaluation of protein sources for young swine

“…Diggs et (1965) and Saben et (1971a, b) Level of protein has profound effect upon the utilization of DE and the ME:DE ratios. Lower values were observed for ME of high protein feeds when the level of the ingredient in the diet was high in the ration or when the protein level of the basal ration was high (May and Bell, 1971 Some investigators (Hill and Renner, 1960;Saben et al, 1971b;Guirguis, 1975Guirguis, , 1976Lodhi et , 1976) have fed diets in which the pro tein source being evaluated was combined with several other protein sources in the basal diet. Associative effects on energy utilization were assumed to be negligible.…”

“…They reported that ME was 81.5% of DE for these high protein feeds. Later, Saben e^ (1971a) evaluated samples of rapeseed and soybean meal as energy sources for growing pigs, and May and Bell (1971) reported the DE…”

“…It is not uncommon to find test diets with extremely high protein content, and oftentimes in trials designed to evalu ate energy of protein sources, one finds more than one protein source in the basal diet. May and Bell (1971), in experiments with growing pigs, formulated two basal diets of 10 and 20% crude protein content, respectively, to which two levels of the test ingredients were added. They observed significant dif ferences between rations for digestibility of protein and energy, as well as DE and ME contents of the feeds.…”