Nelson T S, Kirby L K, Johnson Z B
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville 72701.
Poult Sci. 1990 Jan;69(1):113-8. doi: 10.3382/ps.0690113.
Two experiments were conducted to determine the relative biological values (BV) of phosphorus in feed phosphates. Experiment 2 was a replicate of Experiment 1, except that an additional phosphate source was tested. Within experiments, each treatment was replicated twice. Each pen contained eight broiler cockerels. The experimental diets were composed primarily of corn and soybean meal. The reference phosphate [anhydrous, reagent-grade, dibasic calcium phosphate (AR-DCP)] was added to supply five levels of phosphorus. Each phosphate supplement was added to supply two levels of phosphorus. A regression equation was calculated based on logarithm g, nonphytate phosphorus per kilogram of diet versus the percentage of bone ash from chicks fed diets containing AR-DCP. Nonphytate phosphorus equivalents were calculated using the percentage of bone ash from chicks fed the test phosphates. The biological values of the test phosphates were determined as nonphytate phosphorus equivalents, minus the nonphytate phosphorus in the basal diet, divided by the amount of supplemental phosphorus. The BV obtained for the commercial phosphates in Experiments 1 and 2 were: dibasic calcium phosphate, 106 and 104; monobasic calcium phosphate. 102 and 104; defluorinated phosphate (DFP)-1, 88 and 90; and DFP-2, 100.
进行了两项试验以测定饲料磷酸盐中磷的相对生物学效价（BV）。试验2是试验1的重复，只是多测试了一种磷酸盐来源。在各项试验中，每个处理重复两次。每个围栏饲养八只肉用小公鸡。试验日粮主要由玉米和豆粕组成。添加参比磷酸盐[无水、试剂级、磷酸氢钙（AR-DCP）]以提供五个磷水平。添加每种磷酸盐补充剂以提供两个磷水平。根据每千克日粮中植酸磷的对数与饲喂含AR-DCP日粮的雏鸡骨灰百分比之间的关系计算回归方程。使用饲喂试验磷酸盐的雏鸡骨灰百分比计算植酸磷当量。试验磷酸盐的生物学效价通过以下计算得出：植酸磷当量减去基础日粮中的植酸磷，再除以补充磷的量。试验1和试验2中获得的商品磷酸盐的BV分别为：磷酸氢钙，106和104；磷酸二氢钙，102和104；脱氟磷酸盐（DFP）-1，88和90；以及DFP-2，100。
