Evaluation of Blood Components and Nutritional Status in Japanese Black Cows Grazed on Native, Sown and Native-sown Mixed Pastures

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  • Nakano Miwa
    The United Graduate School of Agricultural Science, Gifu University:(Present office)National Institute of Livestock and Grassland Science
  • Kuzuma Yukiko
    Faculty of Applied Biological Sciences, Gifu University
  • Yayota Masato
    Faculty of Applied Biological Sciences, Gifu University
  • Ohtani Shigeru
    Faculty of Applied Biological Sciences, Gifu University

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  • 大規模な野草地,牧草地および野草牧草混在草地に放牧した黒毛和種繁殖牛の血液性状による栄養状態の評価
  • ダイキボ ナ ヤソウチ ボクソウチ オヨビ ヤソウ ボクソウ コンザイ ソウチ ニ ホウボク シタ クロゲワシュ ハンショクギュウ ノ ケツエキ セイジョウ ニ ヨル エイヨウ ジョウタイ ノ ヒョウカ

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Abstract

This study evaluated nutritional status of Japanese black cows grazed on native, sown and native-sown mixed pastures by analyzing blood components. A blood sample was collected from the coccygeal vein of each cow before grazing. Groups of cows were grazed in one native pasture, three native-sown mixed pastures, and one sown pasture and blood samples were collected during the summer and autumn. In all pasture types, blood component concentrations of the cows before grazing and during the summer were within the normal range. However, increases in blood urea nitrogen and non-esterified fatty acid were observed in cows on the native pasture during autumn, suggesting excess protein and insufficient energy intake. Moreover, blood inorganic phosphate was lower in cows on the native pasture, indicating that phosphate intake was insufficient. Cows in the mixed pastures had increased blood urea nitrogen in autumn, but no energy or phosphate insufficiencies were observed. The results suggest that nutritional status should be considered when grazing cows extensively on native pastures.

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