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...

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Bibliographic Details
Published in:Poultry science 2000-11, Vol.79 (11), p.1586-1591
Main Authors: Douglas, M W, Peter, C M, Boling, S D, Parsons, C M, Baker, D H
Format: Article
Language:English
Subjects:
Amino Acids - metabolism
Animal Feed
Animals
Biological Availability
Cecum - physiology
Chickens
Dietary Proteins - analysis
Dietary Proteins - metabolism
Dietary Supplements
Digestion - physiology
Male
Phytic Acid - analysis
Zea mays - chemistry
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Summary: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.
ISSN:0032-5791
DOI:10.1093/ps/79.11.1586