title: Bioavailability of Phosphorus in Two Cultivars of Pea for Broiler Chicks.
abstract: The aim was to determine the relative bioavailability of phosphorus (P) in peas for 21-day old broiler chickens using slope-ratio assay. One hundred and sixty eight male Ross 308 broiler chicks were divided into 42 groups 4 balanced for body weight and fed 7 diets in a completely randomized design (6 groups/diet) from day 1 to 21 of age. The diets were a corn-soybean meal basal diet, and the corn-soybean meal basal diet to which monosodium phosphate, brown- or yellow-seeded pea was added at the expense of cornstarch to supply 0.5% or 1% total phosphorus. Monosodium phosphate was included as a reference, and hence the estimated bioavailability of P in pea cultivars was relative to that in the monosodium phosphate. Birds and feed were weighed weekly and on d 21 they were killed to obtain tibia. The brown-seeded pea contained 23.4% crude protein, 0.47% P, whereas the yellow-seeded pea contained 24.3% crude protein and 0.38% P. Increasing dietary P supply improved (p<0.05) chick body weight gain and tibia ash and bone density. The estimated relative bioavailability of p values for brown- and yellow-seeded peas obtained using final body weight, average daily gain, tibia ash, and bone mineral density were 31.5% and 36.2%, 35.6% and 37.3%, 23.0% and 5.60%, and 40.3% and 30.3%, respectively. The estimated relative bioavailability of p values for brown- and yellow-seeded peas did not differ within each of the response criteria measured in this study. In conclusion, the relative bioavailability of P in pea did not differ depending on the cultivar (brown- vs yellow-seed). However, the relative bioavailability of P in pea may vary depending on the response criterion used to measure the bioavailability.
authors.affiliation: Department of Animal Resources and Science, Dankook University, Cheonan 330-714, Korea.
authors.forename: T A
authors.initials: TA
authors.lastname: Woyengo
authors.affiliation: Department of Animal Resources and Science, Dankook University, Cheonan 330-714, Korea.
authors.forename: I A
authors.initials: IA
authors.lastname: Emiola
authors.affiliation: Department of Animal Resources and Science, Dankook University, Cheonan 330-714, Korea.
authors.forename: I H
authors.initials: IH
authors.lastname: Kim
authors.affiliation: Department of Animal Resources and Science, Dankook University, Cheonan 330-714, Korea.
authors.forename: C M
authors.initials: CM
authors.lastname: Nyachoti
keywords: Broiler Chickens; Peas; Phosphorus Bioavailability