Nutritive Estimation of Timothy Hay Based on Feeding Experiments with Dairy Cattle

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  • 飼養試験を基礎とするチモシー乾草の品質評価
  • シヨウ シケン オ キソ ト スル チモシー カンソウ ノ ヒンシツ ヒョウカ

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Abstract

Three hays of different cutting stage made from timothy were offered ad libitum to four Holstein cows in a 12 days changeover feeding experiments. In addition, 4.9kg of commercial formula feed was supplmented to each cow as dry basis. Three hays had TDN value of 59.5%(hay A), 55.8%(hay B) and 50.6%(hay C), respectively. The daily dry matter intake of hay varied from 8.5kg (hay C) to 10.3 kg (hay A). In this report, the ratio of the amounts in intake TDN with hay A treatment to hay B and hay C treatment was used as index for relative feed value estimation. The value of these index ware 85%(hay B) and 69%(hay C), respectively. The mean daily milk yields were 17.8kg in hay A, 16.4kg in hay B and 14.6kg in hay C treatment respectively. The milk protein and milk sugar (lactose) yields was significant higher (p<0.05) with hay A treatment than with hay C treatment, and this results was discussed that it may due to difference in the amounts of intake digestible carbohydrates between two hays.

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