アヒルおよびニワトリの消化管内細菌叢の比較

Abstract

In ducks and chickens allowed to have feed ad libitum and forced to be starved for 3 days on ordinary poultry farms, bacterial flora was examined. The results obtained are as follows.1. In ducks under conditions of feeding ad libitum, Streptococci (Str.) and Lactobacilli (Lact.) were predominant in crop, gizzard, duodenum, and the middle and lower level of the small intestine. Enterobacteriaceae (Ent.) and Bacteroidaceae (Bact.) were significantly low in count. Bifidobacterium-like microorganisms (Bifid.), Bact., and Str. were predominant in the cecum, and Bifid., Str., and Bact. in the rectum. On the other hand, in chickens under conditions of feeding ad libitum, Lact. was predominant in all the parts, except the cecum in which Bifid., Lact., and Bact. were predominant.2. When bacterial count was compared between ducks and chickens kept under conditions of feeding ad libitum, there were statistically significant differences on Ent. in the crop, on Str. and Lact. in all the parts of the intestine, and on Bact. in the crop, the lower part of the small intestine, and the rectum.3. There was a significant difference in bacterial flora between chickens and ducks in starvation and those under feeding ad libitum. In both kinds of poultry, Str. and Lact. were reduced significantly in every part of the intestine, but Bact. and Bifid. were predominant in the crop, Bifid. was in the gizzard, duodenum, and both parts of the small intestine, and Bifid., Bact., and Ent. were in the cecum and rectum. Besides, there was not so marked difference in bacterial count of each species between any two parts of the intestine in both kinds of poultry.