摘要
本研究旨在探讨低磷饲粮中添加新型耐热植酸酶替代一部分磷酸氢钙对断奶仔猪钙磷代谢及养分表观消化率的影响。试验选用256头遗传背景相同、初始体重为(8.37±0.97)kg的30日龄断奶仔猪,按完全随机区组设计分为4个处理,每个处理设4个重复,每个重复16头仔猪。4个处理分别饲喂基础饲粮、低磷饲粮、低磷饲粮基础上添加500 U/kg新型耐热植酸酶和低磷饲粮基础上添加1 000 U/kg新型耐热植酸酶的试验饲粮。试验期30 d。结果表明:1)各处理之间血清钙、磷含量及碱性磷酸酶活性差异均不显著(P>0.05),但添加有新型耐热植酸酶的试验组仔猪血清钙、磷含量有升高的趋势。2)在低磷饲粮中添加500、1 000 U/kg新型耐热植酸酶一定程度上提高了蹄骨灰分率和钙、磷含量,但各处理间差异不显著(P>0.05)。3)将仔猪趾骨制成骨骼切片后进行组织学观察,结果发现500、1 000 U/kg新型耐热植酸酶添加组趾骨骨密质较基础饲粮组和低磷饲粮组厚,骨松质较基础饲粮组和低磷饲粮组密集。4)基础饲粮组和新型耐热植酸酶添加组的钙、磷、能量及干物质的表观消化率显著高于低磷饲粮组(P<0.05)。由此可知,断奶仔猪饲粮中添加新型耐热植酸酶替代部分无机磷,能有效促进仔猪机体对饲粮中钙、磷的代谢,并显著提高饲粮中部分养分的表观消化率。综合各项指标,1 000 U/kg的新型耐热型植酸酶能起到更好的替代无机磷的作用。
This experiment was conducted to study the effects of new heat-resistant phytase （NHP） on the metabolism of calcium （Ca） and phosphorus （P） and apparent nutrient digestibility in weaner piglets by replacing part of calcium hydro phosphate by NHP in low-phosphorus diet.A total of 256 piglets [（8.37±0.97） kg] weaned at 30 days of age and with the similar genetic background were randomly allotted to 4 treatments with 4 replicates per treatment and 16 piglets per replicate using a randomized complete-block design.They were fed basal diet,low-phosphorus diet,low-phosphorus diet＋500 U/kg NHP,and low-phosphorus diet＋1 000 U/kg NHP,respectively.The experiment lasted for 30 d.The results showed as follows：1） there was no significant difference in serum Ca and P contents and alkaline phosphatase （ALP） activity among all treatments （P ＞ 0.05）.However,serum Ca and P in the NHP treatments had tendencies of going upward.2） Compared with low-phosphorus diet,the supplementation of 500 or 1 000 U/kg NHP improved Ca and P contents and ash ratio in coffin bone,but there were no differences among all treatments （P＞0.05）.3） The phalanx section of piglets fed the diets supplemented with NHP showeded thicker compact bone and higher cancellous bone than those in basal diet group and low-phosphorus diet group.4） The apparent digestibility of gross energy （GE）,Ca,total phosphorus （TP）,and dry matter （DM） in basal diet group,500 U/kg NHP group and 1 000 U/kg NHP group were higher than those in basal diet group and low-phosphorus diet group （P＜0.05）.In conclusion,by using NPH to replace part of P in diets can improve the metabolism of Ca and P in piglets as well as the apparent digestibility of some nutrients.In addition,1 000 U/kg NHP is an appropriate choice to replace phosphorus in diet.
出处
《动物营养学报》
CAS
CSCD
北大核心
2014年第7期1900-1907,共8页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
"十二五"农村领域国家科技计划(2013BAD10B01)
"十二五"国家科技支撑计划(2011BAD26B03)
关键词
新型耐热植酸酶
仔猪
钙磷代谢
表观消化率
new heat-resistant phytase （NHP）
piglets
calcium and phosphorus metabolism
apparent digestibility
