Histopathological examination was carried out on 162 samples of reproductive organs, particularly the uterine tubr, collected from sterile, pregnant, and slaughtered cows since 1955 to clarify the relationship between sterility and diseases of the uterine tube.
Various pathological changes of this tube were observed in 34 samples (42 uterine tubes). They occurred to the sterile cows at a somewhat higher frequency than the others. They were very mild in the pregnant cows. of them, edema was the most frequent, accompanied by swelling and deposition of fluid in the lumen of the tube. It was classified into three types, multi-acinous, uniacinous, and cystic. The first type was formed by adhesion of mucosal folds and interstitial hypertrophy. In the second type, the fimbriated end of the tube was closed to make the lumen enlarged with regressive folds. The third type was a cystic enlargement of part of the tube as a result of adhesion of mucosal folds. Most of these changes were complicated with ovarian and uterine disorders.

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Chlorination with less than 1, 000ppm of chlorine was not effective at all against Salmonella contaminating the skin. Chlorination with 2, 000 ppm, however, showed a germicidal effect when performed simultaneously with agitation by a stirrer.
Sensitization with 200ppm of chlorine water for 10 minutes was destructive to Salmonella contaminating feathers when the number of contaminating organisms was less than n×10². When it was carried out concurrently with agitation by a stirrer, it became so markedly germicidal as to kill n×10⁴ organisms in 10minutes.
When residual chlorine was 50-100ppm, it destroyed Salmonella contaminating water used for working in the dressing plant and cooling.

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東京近郊の西, 北多摩地方から濃厚飼料主体 (A), 製造カス類主体 (B), 粗飼料主体 (C), 濃厚飼料と粗飼料とが比較的均衡よく給与されている (D) などの酪の乳牛をそれぞれ8～10頭選択し, 飼料給与状態と乳汁成分, 農家血液成分および各群の疾病の発生状況などの関係について調査した.
1. 各酪農家における給与飼料の種類および給与量は全般的に配合飼料, フスマ, 砕麦やとくにB群においては製造カスなどの濃厚飼料が主体であり, 粗飼料給与は少なかった.
2. 可消化粗蛋白質 (DCP) はC群以外の群でやや多く, 可消化養分総量 (TDN) はB群以外の群でやや少なかった.
3. 乳汁成分ではB群は他の群に比して乳脂率と蛋白質が高く, 無脂固形分は低かった. また, カリホルニア乳房炎試験はB群において陽性率が100%であった.
4. 血液成分は各群間のなかで血清蛋白質, 血糖, 無機リン, カルシウムはB群が高い傾向を示し, 血糖はC群がとくに低かった.
5. 尿の定性試験ではケトン体陽性率はA-1群, C群が高く, D群が各群のなかで最も低かった.
6. 各群において疾病の種類はケトン尿症, 乳房炎, 卵巣のう腫が主なものであった. その発症程度はA-1群, B群, C群でケトン尿陽性牛が, B群で乳房炎がとくに多かった. しかしD群ではケトン尿陽性牛をわずかに認めただけで他の疾病の発現をみなかった.

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The NS-175, 1185, and 1358 strains of virulent ILT virus were adapted to monolayers of primary chicken kidney cell cultures. Cultures of chicken embryo fibroblasts, bovine swine and canine kidney cells, and TC, PS and BHK-21 cell (line) swere resistant to the cytopathtic effect of the 11th passage of the NS-175strain. The peak titer of the NS-175, 1185, and 1358 strains was 10^3.5-6.5, 10^3.5-5.5, and 10^3.5-4.7 TCID₅₀/0.1ml, respectively' in chicken kidney cell cultures.
Systematic passage of the NS-175 strain in cell cultures resulted in changes in virus characteristics, which were manifested by a significantly decreased virulence of the virus for susceptible chickens. When inoculated ocularly and intranasally, vaccines prepared from the modifided virus (99th to 124th passage levels) provided good protection against challenge with virulent virus.

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