Effects of Supplemental Fish Meal and Corn Gluten Meal in a Diet Containing Urea and Cassava on the Growth and the Nitrogen Retention of Steers

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  • 尿素およびキャッサバ含有飼料に対する魚粉またはコーン•グルテンミールの添加が去勢牛の成長,窒素出納におよぼす影響
  • ニョウソ オヨビ キャッサバ ガンユウ シリョウ ニ タイスル ギョフン マタ

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1. Studies were made on the effects of two protein sources of different amino acid compositions included in a diet containing cassava flour with urea on the growth and the nitrogen (N) retention of steers. Concentrations of plasma free amino acids were also determined. 2. In a growth trial, nine Holstein steers, averaging 130kg initially, were divided into three groups and alloted to the following three concentrate diets: Diet 1 (control); 82.4% of the total N was derived from urea and the remain from cassava, Diet 2; 55.1% of the total N was derived from urea, 25.9% from fish meal (FM) and the remain from cassava, and Diet 3; 54.0% from urea, 26.3% from corn gluten meal (CGM) and the remain from cassava. All groups were given free access to respective diet, chopped rice straw and water for twelve weeks. 3. Steers receiving diets with supplemental FM and CGM had a tendency for more rapid growth than steers fed the control diet, but the differencies were not significant. Levels of leucine and aspartic acid in plasma were significantly higher in FM and CGM groups than in the control group (P<0.05), and plasma levels of lysine and isoleucine were significantly higher in the FM group (P<0.05). 4. In a N-barance trial, three Holstein steers, weighing about 200kg, were used in a 3×3 Latin square design. Animals were assigned to each concentrate diet used in the growth trial, and fed daily 4.5kg concentrate, 600g rice straw and allowed free access to water, 5. N retention of the CGM group was significantly higher than the other two groups (P<0.05). In the plasma of the CGM group, Ievels of leucine and proline were significantly higher (P<0.05). No remarkable changes were observed in plasma amino acid patterns between the FM group and the control group.

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