The effects of enzyme supplementation on the nutritive value of rye grain (Secale cereale) for the young broiler chick.
Two dose-response experiments utilizing differing enzyme concentrations were carried out to determine the level of a crude enzyme preparation (Trichoderma viride cellulase) required to obtain maximum growth performance in young broiler chicks fed a 60% rye diet. Enzyme concentrations utilized in these studies ranged from .05 to 12.8 g enzyme/kg diet. Enzyme supplementation at the 3.2 g/kg diet level yielded increases in feed consumption and weight gain of 71 and 193%, respectively; and the feed to gain ratio was improved by 43% compared with that for the unsupplemented rye control diet. As no further growth response was obtained by increasing the enzyme concentration, the enzyme level utilized in a subsequent study was 3.2 g/kg diet. A balance study using 2-wk-old broiler chicks was carried out to determine the effect of enzyme supplementation on the bioavailable energy (AMEn) and apparent protein digestibility (APD) of a 60% wheat diet replaced by rye in 10% increments. In the 60% rye diets, the enzyme addition increased the dietary AMEn and APD by 23 and 12%, respectively, compared with the unsupplemented diet. The AMEn and APD of the 60% wheat control diet were increased 9.7 and 4.6%, respectively, by enzyme addition. The data suggest that the AMEn of rye grain is increased by enzyme supplementation; however, alternate methodology will have to be employed to quantitatively determine the extent of these improvements.
Friesen
O D
OD
Department of Animal Science, University of Manitoba, Winnipeg, Canada.
Guenter
W
W
Rotter
B A
BA
Marquardt
R R
RR
D000821:Animal Feed; D000818:Animals; D002480:Cellulase / Q000008:administration & dosage*; D002645:Chickens / Q000254:growth & development* / Q000378:metabolism; D004044:Dietary Proteins / Q000378:metabolism; D004063:Digestion; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects; D004734:Energy Metabolism; D016018:Least-Squares Analysis; D008297:Male; D009753:Nutritive Value; D012044:Regression Analysis; D012434:Secale; D014242:Trichoderma / Q000201:enzymology; D015430:Weight Gain / Q000187:drug effects
D004044:Dietary Proteins; D002480:Cellulase