摘要
Eight female pigs (26–61 kg) provided with a simple T-cannula about 10 cm proximal to the ileo-caecal valve, were used in two experiments to investigate the effects of Ca/P ratio, P level and supplementation with phytase (500 FTU/kg) on precaecal, post-ileal and total tract disappearances of organic matter (OM), phosphorus (P) and calcium (Ca). In experiment 1, two Ca/P ratios and two P levels were tested according to a 2 × 2 factorial arrangement within a Latin square design. In experiment 2, the diets of experiment 1 were supplemented with phytase (500 FTU/kg). There was a substantial absorption of OM, P and Ca in the post-ileal tract for all diets. Precaecal and total tract disappearances of OM were reduced by phytase addition (−4.4 and −0.8%, respectively). Supplementation with phytase resulted in an improvement of total tract and post-ileal P disappearances by 10.3 and 12.1%, respectively, without affecting precaecal P disappearance. Addition of feed phosphate resulted in a higher precaecal disappearance of P (+10.8%), resulting in a higher total tract disappearance of P (+5.9%). Addition of limestone had little effect on disappearances of OM, P and Ca, but reduced activity of supplemental phytase and had a negative influence on growth performance. Precaecal, post-ileal and total tract Ca disappearances were hardly affected by the examined dietary factors. The results might indicate that P from feed phosphate is absorbed primarily prececally and that P from phytate, liberated by microbial phytases, is dominantly absorbed post-illeally.
摘要译文
八雌性猪（26-61公斤），其具有简单的T-套管约10cm近端回肠盲肠阀，在两个实验被用来研究的Ca / P比的影响，磷水平和补充植酸酶（500 FTU / kg）的上的有机物质（OM），磷（P）和钙（Ca）precaecal，后回肠和全消化道失踪。在实验1，2 Ca / P的比率和两个P水平根据在一个拉丁方设计一个2×2阶乘安排进行测试。在实验2中，实验1的日粮中添加植酸酶（500 FTU /公斤）。有是OM，磷和钙在后回肠道所有饮食大量吸收。OM的Precaecal和全消化道失踪被添加植酸酶减少（补充植酸酶导致全消化道和后回肠P失踪分别10.3和12.1％，同比提高，在不影响precaecal P消失。此外饲料磷酸盐导致P（10.8％）的较高precaecal消失，导致P（5.9％）的更高的总道消失。此外石灰石对的OM，磷，钙失踪影响不大，但补充植酸酶的活性降低，并且对业绩增长产生负面影响。 Precaecal，后回肠和总肠道钙失踪是几乎不受被检查饮食因素。该结果可能表明，P从饲料磷酸盐被吸收主要prececally和P的植酸，通过微生物植酸酶解放，是显性吸收后illeally。
M. Seynaeve[†]; G. Janssens[† M. Hesta[† C. Van Nevel[‡] and R. O. De Wilde[†. Effects of dietary Ca/P ratio, P level and microbial phytase supplementation on nutrient digestibilities in growing pigs: precaecal, post-ileal and total tract disappearances of OM,[J]. Journal of Animal Physiology and Animal Nutrition, 2000,83(1): 36-48