Effect of Dietary Aluminum and Phosphorus on Performance, Phosphorus Utilization and Tissue Mineral Composition in Sheep2

作者：Roberto Dale Valdivia, Clarence B. Ammerman, P. R. Henry, J. P. Feaster, Charles J. Wilcox · 发表于：Journal of Animal Science · 年份：1982 · DOI：10.2527/jas1982.552402x · 被引用次数：49 · 研究领域：Ruminant Nutrition and Digestive Physiology、Soil and Water Nutrient Dynamics、Phosphorus and nutrient management

An experiment was conducted to determine the effects of dietary Al and P on P utilization and tissue mineral composition in sheep. Twenty Florida native wether lambs, averaging 36.7 kg, were assigned to four groups in a 2 × 2 factorial arrangement of treatments, with two levels of dietary P as NaH2PO4 (.15 and .29%) and two levels of supplemental Al as A12C13•6H2O (0 and 2,000 ppm). Lambs were used in the same design in three experiments; a feeding trial, a P balance study, and a tissue mineral study. During the 56-d feeding trial, average daily gains by lambs in the four treatments (low P-low Al, high P-low Al, low P-high Al and high P-high Al) were 109, 116, −38 and 15 g, and average daily dry matter intakes were 1,280, 1,320, 780 and 1,080 g, respectively. Both dietary Al and P influenced (P<.05) these values. At the end of the feeding trial, plasma P was lower (P<.05) for sheep given high Al diets and higher (P<.01) for sheep given high P diets. Plasma Ca was decreased (P<.05) by high P and Mg was depressed (P<.01) by high Al. Three lambs in each group were injected iv with .2 mCi of 32for 10 consecutive d before the P balance study. True P absorption coefficients were 28.7, 32.8, −9.2 and 8.5%, and net P retention −48, −4, −404 and −325 mg/animal daily for the four treatment groups, respectively. Al depressed (P<.05) P absorption and retention. Metabolic fecal P averaged 483, 820, 206 and 460 mg/animal daily, respectively, and was influenced (P<.05) by P and Al in the di...