Nutritional evaluation of low phytate and high protein corns.
Three chick experiments and two cecectomized rooster experiments were conducted to determine P bioavailability and amino acid (AA) digestibility in two low phytate corns (LP), a high protein corn (HP), and a corn containing both low phytate and high protein content (HP/LP) compared with conventional corn (CONV). From 8 to 20 or 21 d of age, 1-wk-old New Hampshire x Columbian chicks were fed a cornstarch-dextrose-soybean meal (SBM) basal diet containing 0.10% available P or the basal diet supplemented with two concentrations of P (0.05 or 0.06% and 0.10 or 0.12%) from KH2PO4 or two concentrations of the corns (20 or 21% and 40 or 42%). Bioavailability of P based on tibia bone ash was much higher for LP than for CONV; values ranged from 21 to 40% for CONV and from 59 to 95% for LP. Digestibility of AA in cecectomized roosters indicated no significant differences (P > 0.05) between CONV and HP in the first rooster experiment. Digestibilities of eight AA, including lysine, methionine, and arginine, in LP and HP/LP were higher (P < 0.05) than those in CONV in the second rooster experiment. The results of this study indicated that the P in LP was two to three times more bioavailable than the P in CONV and that the digestibilities of AA in HP/LP were equal to or higher than those in CONV.
Douglas
M W
MW
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Peter
C M
CM
Boling
S D
SD
Parsons
C M
CM
Baker
D H
DH
D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D001682:Biological Availability; D002432:Cecum / Q000502:physiology; D002645:Chickens; D004044:Dietary Proteins / Q000032:analysis* / Q000378:metabolism*; D019587:Dietary Supplements; D004063:Digestion / Q000502:physiology*; D008297:Male; D010833:Phytic Acid / Q000032:analysis*; D003313:Zea mays / Q000737:chemistry
D000596:Amino Acids; D004044:Dietary Proteins; D010833:Phytic Acid