Effects of Supplemental Calcium Carbonate on the Distribution of Iron, Copper, Zinc and Manganese in Digestive Tract of Sheep

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  • YANO Hideo
    Department of Animal Science, College of Agriculture, Kyoto University
  • MATSUI Hajime
    Department of Animal Science, College of Agriculture, Kyoto University
  • KAWASHIMA Ryoji
    Department of Animal Science, College of Agriculture, Kyoto University

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Other Title
  • 飼料中への炭酸カルシウム添加がめん羊の消化管内容物中鉄,銅,亜鉛,マンガン濃度に及ぼす影響
  • シリョウチュウ エ ノ タンサン カルシウム テンカ ガ メンヨウ ノ ショウ

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Abstract

Six sheep were divided into three groups. Each group was given a ration containing respectively 0.1, 0.6 and 1.2% calcium. The dietary calcium level was adjusted by the addition of calcium carbonate. Polyethylene glycol was utilized as a marker. After 67 days feeding, all sheep were sacrificed 2 hours after the morning feeding. Digestive contents were taken from the rumen, omasum, abomasum, upper small intestine, middle small intestine, lower small intestine, cecum and colon. Iron and copper concentrations in dry matter of digesta sampled from the upper part of small intestine decreased with the elevation of dietary calcium. In the sites of rumen, omasum and abomasum, the copper was also lower in sheep given the highest calcium ration than in animals fed with the lowest. The decrease in iron and copper secretion into the digestive tract might be induced by a consecutive high calcium intake. Zinc in the rumen, the abomasum and the upper small intestine tended to be decreased by the addition of calcium carbonate. Manganese in dry matter of digesta taken from the colon had a trend to increase and those in supernatant from the cecum and the colon, on the contrary, lowered with the elevation of dietary calcium. These results suggested that a high calcium intake might result in the changes of zinc and manganese metabolism in rumi-nants.

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