Woyengo T A, Emiola I A, Kim I H, Nyachoti C M
Department of Animal Resources and Science, Dankook University, Cheonan 330-714, Korea.
Asian-Australas J Anim Sci. 2016 Mar;29(3):396-403. doi: 10.5713/ajas.15.0299. Epub 2016 Mar 1.
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.
目的是采用斜率比法测定21日龄肉鸡对豌豆中磷（P）的相对生物利用率。168只雄性罗斯308肉鸡雏鸡被分为42组，按体重均衡分组，从1日龄到21日龄采用完全随机设计饲喂7种日粮（每种日粮6组）。日粮为玉米 - 豆粕基础日粮，以及用磷酸二氢钠、褐籽豌豆或黄籽豌豆替代玉米淀粉以提供0.5%或1%总磷的玉米 - 豆粕基础日粮。磷酸二氢钠作为参比，因此豌豆品种中磷的估计生物利用率是相对于磷酸二氢钠中的磷而言的。每周对鸡和饲料进行称重，在第21天宰杀鸡以获取胫骨。褐籽豌豆含23.4%粗蛋白、0.47%磷，而黄籽豌豆含24.3%粗蛋白和0.38%磷。增加日粮磷供应可提高（p<0.05）雏鸡体重增加、胫骨灰分和骨密度。利用终末体重、平均日增重、胫骨灰分和骨矿物质密度得到的褐籽和黄籽豌豆磷的估计相对生物利用率分别为31.5%和36.2%、35.6%和37.3%、23.0%和5.60%、40.3%和30.3%。在本研究测量的每个反应指标中，褐籽和黄籽豌豆磷的估计相对生物利用率没有差异。总之，豌豆中磷的相对生物利用率不因品种（褐籽与黄籽）而异。然而，豌豆中磷的相对生物利用率可能因用于衡量生物利用率的反应指标而异。
