Studies on Fodder Yaest

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  • HATA Kosei
    Department of Preventive Veterinary Medicine and Hygiene, College of Agriculture, University of Osaka Prefecture

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Other Title
  • 飼料酵母に関する研究
  • シリョウ コウボ ニ カンスル ケンキュウ 1
  • 1 Multiplication of Rhodotorula by Addition of Organic-acid Producing Bacteria, Especially Lactic-acid Bacteria and Escherichia coli
  • I有機酸醗酵菌添加によるRhodotorulaの増殖について(ことに乳酸菌及び大腸菌添加による場合)

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Abstract

The ultimate aim of this series of studies is to find out a method for high-yield biosynthesis by utilizing Torula. However, Torula grows so rapidly that it is very difficult to understand its essential properties.<BR>In the present research, therefore, experiments have been carried out with Rhodotorula, in which it takes four days until it reaches the maximum growth. Such bacteria as Strept. lactis, the Yukitoshi strain of E. coil and Bact. succinicum, which produce organic acids in the aerobic condition, were added to culture media at the time when the fermentation of Rhodotorula began, and one day and two days before, and after fermentation respectively. The results were as follows.<BR>1. When the Yukitoshi strain of E. coli and Rhodotorula were planted and cultivated at the same time, the yield of Rhodotorula was two and a half times as much as that in the absence of the Yukitoshi strain.<BR>2. A better yield of Rhodotorula was obtained when the Yukitoshi strain was added to the medium and statically cultivated for one day and then the culture was pasteurized at 65°C for 15 minutes, at the end of which Rhodotorula was cultivated in this medium.

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