子牛の第一胃における尿素からの菌体蛋白合成能の発達ならびに尿素給与が第一胃内発酵に与える影響

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  • Development of the Ability for Microbial Protein Synthesis from Urea in the Rumen of Calves and Influence of Urea Feeding on Rumen Fermentation in Young Calves
  • コウシ ノ ダイ1イ ニ オケル ニョウソ カラ ノ キンタイ タンパク ゴウ

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To examine the development of the ability for microbial protein synthesis from urea in the rumen of calves and to investigate the influence of urea feeding on rumen fermentation in young calves, rumen fluids collected from rumen-fistulated calves fed urea (Group UR) or soybean oil meal (Group SM) as the main nitrogen source were used as an inoculum for an artificial rumen containing urea as a sole nitrogen source and some characteristics of it were estimated. The results obtained are summarized as follows: 1. Amount of increased protein-N and rate of disappearance of ammonia-N in the artificial rumen increased steadily with age reaching a peak at 6 or 8 weeks of age for Group UR or Group SM, respectively, and thereafter remained relatively constant. 2. Throughout the trial period, ammonia-N concentrations in artificial rumen after incubation tended to be lower for Group UR than for Group SM. 3. With respect to ruminal ammonia-N concentration, Group SM gradually decreased with time till 2 to 4 hours after feeding. In contrast, Group UR rapidly increased to reach a peak at 1 hour after feeding and this peak value was the highest, about 40mg/100ml, at 8 weeks of age and 25 to 30mg/100ml, thereafter. 4. In both groups, ruminal VFA concentration steadily increased with age reaching an approximately constant level at 8 weeks of age. Group UR in comparison to Group SM tended to be higher throughout the trial period, especially at 4 and 6 weeks of age. 5. The molar percentage of VFA changed at a wide range with age till 8 weeks of age, but not thereafter. 6. From these results, it is concluded that the ability for microbial protein synthesis from urea in the rumen of calves fed urea reached adult level at about 6 weeks of age and that the rumen fermentation in calves tended to be stabilized by 8 weeks of age and was not influenced deleteriously by feeding urea.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 47 (12), 711-718, 1976

    公益社団法人 日本畜産学会

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