Forty dogs were administered with prostaglandin F2α. A dose of 20-30μg/kg was effective for the induction of labor pains, stimulation of delivery, and reduction of the time required for parturition. A dose of 7-10μg/kg was approriate for the prevention of placental and postpartum hemorrhage. Such side effects as celialgia, emesis, and diarrhea reported to be shown in human beings were not observed in any dogs.
A total of 105 strains ofYersinia enterocolitica (YE) were isolated from bovine cecal contents, commercial meat, and the employees' fingers, utensils, and facilities of meat shops. They belonged to biotype 1. They were divided into 11 serotypes, of which 05, 010, and 012 showed a high frequency of detection. In addition, 95 strains of nontypical YE were isolated. YE was detected from 10.3% of 145 samples of bovine cecal contents, 24.2% of 61 samples of beef, 67.5% of 40 samples of pork, 40.0% of 40 samples of chicken, and 23.7% of 228 swab samples collected in meat shops.
Both in summer and winter, experiments were carried out on contact infection with first-stage larvae ofDictyocaulus viviparus. In each of them, a calf discharging these larvae in feces lived together with two healthy calves in the same pen for one month. In summer, two of two experiments eowed mild or moderate infection in the two calves in each pen. In winter, one of two experiments showed mild infection. in the two calves in the same pen. The other experiment showed no infection in the two calves.
From February, 1974, to September, 1975, a survey was conducted on the incidence of bovine mastitis caused by Pseudomonas aeruginosa (PA) in Chiba Prefecture. As a result, this mastitis was seen in 9.5% of 137 cows and 8.5% of 224 udders examined. PA serotypes 1, 7, 8, 10, 12, and 13 were isolated from milk samples collected from these affected udders. The sera of 5 cows with clinical mastitis from which PA was isolated abundantly in a pure state showed the highest titer, of 1: 160 in the OEP-HA test. PA isolated from milk affected with bovine mastitis presented moderate sensitivity to polymyxin B, colistin, dihydrostreptomycin, and sulbenicillin. Sulbenicillin seemed to be a promissing remedy for this type of mastitis.