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首页> 外文期刊>Journal of Animal Physiology and Animal Nutrition >Phosphorus excretion by mares post-lactation
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Phosphorus excretion by mares post-lactation

机译：母马磷排泄后哺乳期

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Across the equine literature, estimates of true P digestibility range from -23% to 79%. This large range cannot be explained by differences in P intake or phytate-P intake alone. However, differences in endogenous P secretion into the GI tract may explain the variation. In horses, excess absorbed P is not excreted in the urine but is re-secreted into the GI tract, increasing faecal P and leading to estimates of low P digestibility. Thus, accurate estimates of P digestibility can only be obtained if absorbed P is retained in the horse. The objective of this study was to examine P digestibility in post-lactational mares and control mares that were fed similar amounts of P. It was hypothesized that post-lactational mares would have greater P retention and higher apparent P digestibility than control mares. Prior to the study, four lactating and four non-lactating mares were fed a diet that provided 100% of the control mares' P requirement, but only 55% of the lactating mares' P requirement. During the study, both groups were fed P at the rate recommended for non-lactating mares. Post-lactational mares did not retain more P than control mares but tended to excrete more P than control mares (p = .082), presumably due to differences in endogenous P secretion into the GI tract. Metabolic changes occurring during mammary gland involution may have contributed to the increase in P excretion. However, faecal P excretion exceeded P intake in both groups (p = .08) and both groups lost weight during the study. Tissue mobilization during weight loss may have influenced P secretion into the GI tract.
机译：在马上文献中，真正的P消化率范围为-23％至79％。这种大范围不能通过P入口或Phytate-P Intake的差异来解释。然而，内源性P分泌到GI道的差异可以解释变异。在马匹中，过量吸收的P未在尿液中排出，但重新分泌到Gi沟中，增加粪便P，并导致低P消化率的估计。因此，如果吸收的P保留在马中，只能获得P消化率的精确估计。本研究的目的是研究乳制品后母马的P消化率，并控制喂养类似的P的母马。假设乳制品后母马将具有更高的P保留和比对照母体更高的表观P消化率。在研究之前，需要四个哺乳和四个非哺乳动物的母猪，饲料提供100％的控制母牛P要求，但只有55％的哺乳动门母马的P要求。在研究期间，两组在建议非哺乳动物母马的速率下喂食P.后乳母马斯没有保留更多的p，而不是控制母马，但倾向于排泄比对照母马（p = .082）排泄，这可能是由于内源性P分泌到GI道的差异。在乳腺腺体下发生的代谢变化可能导致P排泄的增加。然而，粪便P排泄超过了两组（P = .08）中的p摄入量，并且在研究期间，这两个群体都损失了重量。体重减轻期间的组织动员可能会影响P分泌到Gi沟中。

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