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首页> 美国卫生研究院文献>Journal of Animal Science >Standardized total tract digestibility of calcium varies among sources of calcium carbonate but not among sources of dicalcium phosphate but microbial phytase increases calcium digestibility in calcium carbonate
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Standardized total tract digestibility of calcium varies among sources of calcium carbonate but not among sources of dicalcium phosphate but microbial phytase increases calcium digestibility in calcium carbonate

机译：标准化的钙的总钙消化率在碳酸钙来源中变化但不是磷酸二钙的来源但微生物植酸酶增加了碳酸钙中的钙消化率

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Two experiments were conducted to test the hypothesis that standardized total tract digestibility (STTD) of Ca and the response to microbial phytase is constant among different sources of Ca carbonate and that the STTD of Ca is constant among different sources of dicalcium phosphate (DCP) when fed to growing pigs. In Exp. 1, 80 pigs (initial BW: 19.0 ± 1.9 kg) were randomly allotted to 10 diets and 2 blocks with 4 pigs per diet in each block. Four sources of Ca carbonate were used, and each source was included in a diet without microbial phytase and a diet with microbial phytase (500 units/kg diet). Two Ca-free diets without or with microbial phytase were also formulated. Feed allowance was 2.7 times the maintenance energy requirement for ME and daily feed allotments were divided into 2 equal meals. The initial 4 d of each period were considered the adaptation period to the diets followed by 4 d of fecal collection using the marker-to-marker procedure. Pigs fed diets containing exogenous phytase had lower (P < 0.05) basal endogenous loss of Ca compared with pigs fed diets containing no phytase. There were no interactions between phytase and source of Ca carbonate. Values for STTD of Ca were greater (P < 0.05) for diets containing microbial phytase (77.3% to 85.4%) compared with diets without exogenous phytase (70.6% to 75.2%), and values for STTD of Ca differed (P < 0.05) among the 4 sources of Ca carbonate. In Exp. 2, 40 pigs (initial BW: 14.9 ± 1.3 kg) were allotted to a completely randomized design with 5 diets and 8 replicate pigs per diet. A basal diet in which all Ca was supplied by Ca carbonate was formulated. Three diets were formulated by adding 3 sources of DCP to the basal diet and a Ca-free diet was also used. Feeding and collection methods were as described for Exp. 1. Results indicated that values for STTD of Ca and ATTD of P were not different among diets, indicating that under the conditions of this experiment, the digestibility of Ca and P in DCP appears to be constant regardless of origin of DCP. In conclusion, use of microbial phytase reduces the basal endogenous loss of Ca and increases Ca digestibility in Ca carbonate. The STTD of Ca varies among sources of Ca carbonate, regardless of phytase inclusion, but that appears not to be the case for the STTD of Ca in different sources of DCP.
机译：进行了两次实验以测试CA的标准化总散射消化率（STTD）的假设，以及对微生物植酸酶的响应在Ca碳酸盐的不同来源中，并且Ca的STTD在磷酸二钙（DCP）的不同源之间是恒定的喂养生长猪。在exp。 1,80猪（初始BW：19.0±1.9千克）随机分配给10次饮食，每块饮食4种猪，每次饮食。使用了四种Ca碳酸盐源，并且每种源包括在没有微生物植酸酶的饮食中和微生物植酸酶的饮食（500单位/ kg饮食）。还配制了两个没有或微生物植酸酶的无加入饮食。饲料津贴为ME的维护能源需求和每日饲料分配分为2份相等的膳食。每个时期的初始4d被认为是使用标记物到标记程序的饮食的适应期随后进行4 d粪便收集。饲喂含有外源性植酸酶的饮食的饮食具有较低（P <0.05）Ca的基础内源性损失与含有没有植酸酶的饮食的猪相比。植酸酶与Ca碳酸盐源之间没有相互作用。与没有外源性植酸酶的饮食（77.3％至85.4％）的饮食（77.3％至85.4％）的饮食（77.3％至85.4％）的饮食更大（P <0.05）的值（77.3％至75.4％），以及Ca的STTD的值不同（P <0.05）在Ca碳酸盐的4个来源中。在exp。 2,40猪（初始BW：14.9±1.3千克）分配给完全随机的设计，每次饮食5颗饮食和8粒。配制其中Ca碳酸酯提供所有CA的基础饮食。通过将3个DCP来源添加到基础饮食中，使用三种饮食和使用无饮食。喂养和收集方法如EXP所述。 1.结果表明，饮食中CA和ATTD的STTD的值在饮食中没有不同，表明在该实验的条件下，无论DCP的起源如何，DCP中CA和P的消化率似乎是恒定的。总之，使用微生物植酸酶降低了Ca的基础内源性损失，并增加了Ca碳酸盐的Ca消化率。无论植酸酶包容如何，CA的STTD都在Ca碳酸盐的来源中变化，但是由于DCP的不同来源，似乎不作为CA的STTD的情况。

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