Burnell T W, Cromwell G L, Stahly T S
Department of Animal Sciences, University of Kentucky, Lexington 40546-0215.
Poult Sci. 1990 Jul;69(7):1110-7. doi: 10.3382/ps.0691110.
A total of 576 d-old, male, broiler chicks were used in two trials 1) to determine the range of Ca and P levels over which the response in bone characteristics is linear and 2) to determine the influence of particle size of defluorinated rock phosphate (DFP) on the bioavailability of Ca and P in DFP. Six treatments were used in Experiment 1 in which varying percentages of added Ca (.00, .06, .12, .24, .36, and .48%) and added P (.00, .05, .10, .20, .30, and .40%) were evaluated in a corn-soybean meal diet containing 23% CP, .47% Ca, and .39% P (.14% available P). Weight gain, feed intake, and tibia breaking strength increased (P less than .001) with increasing levels of dietary Ca and P. Treatments in Experiment 2 consisted of: 1) Diet 1, a corn-soybean meal basal diet (23% CP, .50% Ca, .46% P, .21% available P), 2) Diet 1 with .12% added Ca from calcium carbonate (CC) and .07% added P from monosodium phosphate (MSP), 3) Diet 1 with .24% added Ca from CC and .14% added P from MSP; and 4 to 8), Diet 1 with .24% added Ca and .14% added P from five particle sizes of DFP. Feed intake, weight gain, and tibia breaking strength and ash percentage increased linearly (P less than .01) and feed:gain ratio decreased quadratically (P less than .10) with increasing percentages of added Ca and P in Diets 1 to 3.(ABSTRACT TRUNCATED AT 250 WORDS)
总共576只1日龄雄性肉仔鸡用于两项试验：1）确定钙和磷水平的范围，在此范围内骨骼特性的反应呈线性；2）确定脱氟磷酸岩（DFP）颗粒大小对DFP中钙和磷生物利用率的影响。试验1采用六种处理，在含23%粗蛋白、0.47%钙和0.39%磷（0.14%有效磷）的玉米-豆粕日粮中评估不同添加比例的钙（0.00%、0.06%、0.12%、0.24%、0.36%和0.48%）和磷（0.00%、0.05%、0.10%、0.20%、0.30%和0.40%）。随着日粮钙和磷水平的增加，体重增加、采食量和胫骨断裂强度增加（P<0.001）。试验2的处理包括：1）日粮1，玉米-豆粕基础日粮（23%粗蛋白、0.50%钙、0.46%磷、0.21%有效磷）；2）日粮1添加0.12%来自碳酸钙（CC）的钙和0.07%来自磷酸二氢钠（MSP）的磷；3）日粮1添加0.24%来自CC的钙和0.14%来自MSP的磷；以及4至8），日粮1添加0.24%的钙和0.14%的磷，这两种元素来自五种颗粒大小的DFP。在日粮1至3中，随着添加钙和磷比例的增加，采食量、体重增加、胫骨断裂强度和灰分百分比呈线性增加（P<0.01），料重比呈二次方下降（P<0.10）。（摘要截短于250字）
