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Effects of black-hulled rice (<i>Oryza sativa</i> L.) feeding on digestibility, ruminal fermentation, and oxidative status markers in sheep

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  • 紫黒米の給与がヒツジの飼料消化性，第一胃内性状および酸化ストレスマーカーに及ぼす影響
  • ムラサキ クロゴメ ノ キュウヨ ガ ヒツジ ノ シリョウ ショウカセイ,ダイイチ イ ナイ セイジョウ オヨビ サンカ ストレスマーカー ニ オヨボス エイキョウ

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Abstract

<p>Some anthocyanins have been reported to show antioxidant activity and to enhance antioxidant enzyme activity. This study examined the effects of diets including black-hulled rice, which contains abundant anthocyanin, on digestibility, ruminal fermentation, and oxidative status markers in sheep. Six wethers were used in a replicated 3×3 Latin square design with three dietary treatments : a diet containing 40% anthocyanin-free and hulled rice, one containing 40% black-hulled rice, and one containing an equal mixture of anthocyanin-free and black-hulled rice. Increasing the proportion of black-hulled rice led to total dry matter digestibility and total digestible nutrients content, whereas the nutrient digestibilities (crude protein, ether extracts, non-fibrous carbohydrate, starch, acid detergent fiber, and neutral detergent fiber) did not differ significantly among the dietary treatments. In each diet, starch was digested almost completely (>99.5%). There were no significant differences among the diets in any parameters of ruminal fermentation, such as pH, ammonia concentration, and volatile fatty acids concentrations and ratios. Feeding with black-hulled rice increased the activity of superoxide dismutase, an antioxidant enzyme, although the total antioxidant capacity and degree of oxidative damage were identical among the three diets. These findings suggest that black-hulled rice has strong potential to be used as a source of both starch and antioxidants in ruminants.</p>

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