Miller W J, Neathery M W, Gentry R P, Blackmon D M, Crowe C T, Ware G O, Fielding A S
Department of Animal and Dairy Science, University of Georgia Athens 30602.
J Dairy Sci. 1987 Sep;70(9):1885-92. doi: 10.3168/jds.S0022-0302(87)80227-8.
Bioavailability of P from defluorinated phosphate and dicalcium phosphate and the P requirement were studied with 63 male Holstein calves. A P depletion diet containing .08% total P on a dry matter basis was fed to all animals for 4 wk beginning at 6 wk of age and 61 kg weight. Calves developed typical signs of P deficiency. The depletion period was followed by a 6-wk experimental period in which the same depletion diet was used as a control. Phosphorus from each of the two sources was added to make diets containing .14, .20, and .32% total P. Source of supplemental P did not affect weight gains, feed consumption, feed efficiency, serum inorganic P, serum alkaline phosphatase, or bone ash.
用63头雄性荷斯坦犊牛研究了脱氟磷酸盐和磷酸二钙中磷的生物利用率以及磷的需求量。从6周龄、体重61千克开始，给所有动物饲喂一种干物质基础含磷总量为0.08%的低磷日粮，持续4周。犊牛出现了典型的磷缺乏症状。在为期6周的干预期之后，接着是6周的试验期，在此期间使用相同的低磷日粮作为对照。将来自两种来源的磷添加到日粮中，使日粮的总磷含量分别达到0.14%、0.20%和0.32%。补充磷的来源对体重增加、采食量、饲料效率、血清无机磷、血清碱性磷酸酶或骨灰没有影响。
