Urea Utilization by Calves during their Growth up to Six Months of Age

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  • 子牛の6ヵ月齢以前における尿素利用
  • コウシ ノ 6カゲツレイ イゼン ニ オケル ニョウソ リヨウ

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1. In an attempt to clarify urea utilization by young calves, performance of calves fed urea (Group UR) as supplemental nitrogen source was compared to that of calves fed soybean meal (Group SM) in Trial I and ammonium acetate (Group AA) or ammonium bicarbonate (Group AB) in Trial II, between 14 and 25 weeks of age. 2. In Trial I, Group UR grew as rapidly as Group SM. Feed conversion efficiency of Group UR was similar to that of Group SM. 3. In Trial II, Group UR grew at the same rate as Group AA, and its feed conversion efficiency was approximately equal to that of Group AA. Group AB tended, though non-significant, to be slightly inferior to other groups. 4. All groups in Trials I and II grew at a more rapid rate than the NRC standard (1.00 kg/day)1).

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