Nutritional value of soybean meal produced from conventional, high-protein, or low-oligosaccharide varieties of soybeans and fed to broiler chicks.
Three experiments were conducted to determine the feeding value to broiler chicks of soybean meal (SBM) produced from high-protein (SBM-HP), low-oligosaccharide (SBM-LO), or conventional (SBM-CV) varieties of soybeans. The 3 SBM contained 54.9, 53.6, and 47.5% CP, respectively. The standardized digestibility (SDD) of amino acids (AA) in the 3 ingredients was measured using a precision-fed rooster assay with cecectomized Single Comb White Leghorn roosters. Results indicated that the SDD of AA was not different among the 3 sources of SBM, with the exception that the SDD of Lys in SBM-HP tended to be greater (P = 0.07) than that in SBM-CV. In the second experiment, a precision-fed rooster assay was used to measure the concentration of TME(n) in each source of SBM. Results indicated that the TME(n) in SBM-HP was greater (P < 0.001) than those in SBM-LO and SBM-CV (3,104 vs. 2,984 and 2,963 kcal/kg of DM). A 14-d growth performance experiment was also conducted using 120 Ross 308 male commercial broiler chicks (mean initial BW = 102.6 g) that were allotted to a completely randomized design. There were 5 chicks/pen and 8 replicate pens/diet. Three corn- and SBM-based diets were formulated based on the data for digestible AA and TME(n) that were measured in the previous experiments. Each source of SBM was used in 1 diet, but because of the greater concentrations of digestible AA in SBM-HP and SBM-LO than in SBM-CV, the inclusion of SBM-HP and SBM-LO were 31.21 and 32.60%, respectively, whereas an inclusion of 38.21% SBM-CV was used. There were no differences among the 3 diets for BW gain or feed efficiency, which indicated that the reduced inclusion rates of SBM-HP and SBM-LO compared with SBM-CV were not detrimental to broiler chick growth performance. It was concluded that, compared with SBM-CV, SBM-HP and SBM-LO are needed in lower concentrations in diets fed to broiler chicks because these 2 sources of SBM have a greater nutritional value than does SBM-CV.
Department of Animal Sciences, University of Illinois, Urbana, IL 61801, USA.
K M
KM
Baker
P L
PL
Utterback
C M
CM
Parsons
H H
HH
Stein
D000596:Amino Acids / Q000378:metabolism; D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000254:growth & development* / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D018506:Gene Expression Regulation, Plant; D008297:Male; D009844:Oligosaccharides / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D013025:Glycine max / Q000737:chemistry*
D000596:Amino Acids; D009844:Oligosaccharides; D010940:Plant Proteins