36头生长阶段香猪去势公猪，通过3×3析因安排分组，完全随机区组设计，随机分配到9个处理中，每个处理4个重复，每个重复1头猪，试验两个因素中日粮磷的3个水平分别为0.3%、0.6%和0.9%；日粮钙磷比例的3个水平为1：1、1.25:1和1.5:1。试验基础日粮由玉米、豆粕、血粉和苜蓿粉组成，各处理日粮磷水平和鲆 磷比例用CaCO3、Na2HPO4和CaHPO4调配，从试验开始到结束，每隔两周颈静脉采血一次测血清AKP活性和钙、磷，并于试验结束时屠宰全部试验猪 取小肠和肋骨样测AKP活性，试验结果表明，血清AKP活必玫第六肋骨AKP活性随日粮磷从0.3%增加至0.9%显著下降（P<0.05)，但十二指肠AKP活性不受日粮磷水平影响，日粮钙磷比例不影响血清、第六肋骨和十二指肠AKP活性（P>0.05)。血清磷随日粮磷增加而增加，随日粮钙磷比例增加而下降，血清钙不受日粮磷水平影响，但在日粮钙磷比例为1.25:1时最高。
The effects of dietary phosphorus and calcium:phosphorus ratio on the activities of alkline phosphatase(AKP) in the serum,duodenum and the sixth rib and on serum phosphorus and calcium levels were evaluated using thirty-six growing castrated Xiang pigs,in a 3×3 factorial trial involving nine diets.The basal diet of corn,soybean,blood meal and alfalfa meal contained 0.29% calcium and 0.30% phosphorus.For the nine treatment diets,phosphorus levels of 0.3%,0.6% and 0.9% were combined with calcium:phosphorus ratios of 1:1,1.25:1 and 1.5:1.Levels of dietary phosphorus and calcium:phosphorus ratio in the diets were adjusted with CaCO3,Na2HPO4 and CaHPO4.The activity of AKP in the serum and in the sixth rib reduced significantly as dietary phosphorus level increased from 0.3% to 0.9%(P<0.05),but the activity of duodenal AKP and serum calcium level were not affected by different levels of dietary phosphorus.There were no effects of calcium:phosphorus ratio on AKP activity in serum,duodenum or the sixth rib(P>0.05).Serum phosphorus level increased as dietary phosphorus increased and decreased as dietary calcium to phosphorus ratio increased.Serum calcium level was highest with the 1.25:1 calcium:phosphorus ratio.
CHINESE JOURNAL OF ANIMAL NUTRITION
miniature pig(Xiang pig)
calcium to phosphorus ratio
serum calcium and phosphorus