[in Japanese]

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[in Japanese]

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Two experiments were made on the digestibility, TDN, and biological value of red clover silage for pigs weighing about 20kg. The results obtained were as follows:
1. Digestibilities of every components in experiment 1 were higher than those in experiment 2, that is, digestibilities of crude protein were 56 and 53% and TDNs per dry matter were 62 and 55%, respectively, when determined by total collection method. It was considered that the difference due to the stage of maturity of red clover.
2. Digestibilities of every components determined by total collection method were higher than those determined by chromic oxide omethod. But the difference was not significant.
3. The biological value of crude protein of red clover silage was about 50% and improved to above 70% by adding methionine. The improved value corresponded to the values of casein and a commercial formula feed.
4. The biological value of a commercial feed and that of the feed containing 20% dried silage were determined, and it was found that there was no difference in biological value between them. It was considered that shortage of methionine of red clover silage was supplemented with excess methionine in the formula feed, because addition of methionine had no effect on improving biological value in both feeds.

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Effect of caprylohydroxamic acid (CHA), a potent urease inhibitor, on ammonia and urea levels, and urease activity in gastrointestinal contents of swine was studied.
Nine pigs were devided into two groups. Three pigs in treatment lot were basal diet containing 0.1%CHA and the others were fed the basal diet. Feed and water were supplied ad libitum througout the experiment.
The results were as follows;
1. In both control and treatment groups, ammonia concentration gradually increased from stomach to large intestine with changing the portions of gastrointestinal tract.
Compared with ammonia levels in both groups, the treatment pigs had a higher ammonia level than the control pigs at stomach and caecum. But inversely the latters showed a higher ammonia level than the former at jejunum, ileum and colon. However, there were no significant differences between control and treatment groups.
2. Urea concentration was increased at small intestine, but decreased at large intestine in both groups. Feeding of the diet containing CHA significantly increased urea concentration at duodenum and jejunum.
3. Urease activity was determined on sotmach, jejunum, colon and rectum contents.
The treatment pigs showed lower urease activity than the controls, but the statistical significance were only obtained at rectum.
4. These results suggest that urea hydyolysis is major source of exogenous ammonia in gastrointestinal contents and CHA inhibits the urease activity or the urea hydrolysis.

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