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牛注射型乳房炎ワクチン全頭一斉投与による乳房炎防除効果
Get PDFBulletinAn injectable vaccine have become popular as a preventive measure against bovine mastitis. This vaccine is designed to be administered three times to healthy pregnant cows: 45 days before, 10 days before, and 52 days after the expected calving date. This protocol requires different vaccination dates for each individual cow, which can be time-consuming on farms with many cows. To test the utility of herd-based vaccination as an alternative, we simultaneously administered the mastitis vaccine to all of the cows in a milking herd. The commercial vaccine was administered on the same days to 20 Holstein cows. Three doses were administered at 5-week intervals. Milk samples from five of the cows were collected every week for the measurement of the somatic cell count (SCC) and viable bacterial count (VBC), and the species identification was performed according to conventional methods. The incidence of mastitis was compared with that of 14 non-vaccinated cows kept in the same barn during the previous year. The SCCs and VBCs of the five vaccinated cows were all in the normal range during the study period, although a transient increase in both variables was observed. The number of cows treated for mastitis, the number of cases of mastitis and the duration of mastitis treatment in the non-treated group were three of 14 cows (21.4%), 21 cases, and 3.6±3.1 days; the corresponding values in the simultaneously treated group were one of 20 cows (0.5%), one case, and 3.6±1.6 days. These results indicate that the simultaneous administration of the vaccine to a milking herd was as effective as the designed administration protocol for preventing mastitis, and the simultaneous administration can be expected to reduce the time and effort required for herd management.departmental bulletin pape
酪農学園フィールド教育研究センター作物生産ステーションにおける基礎ゼミ農園の見本園新設と展示作物について
Get PDFBulletinIn 2021, an exhibition garden was set up within the basic seminar garden of the Crop Production Station at Rakuno Gakuen Field Education and Research Center. In 2021, 34 crops from 12 taxonomic families were grown in the exhibition garden; in 2022, 24 crops from 11 families were cultivated. In both years, college students used the garden for the subjects “Practicum for Introduction to Healthy Soil and Healthy People” and “Horticultural Practices.” In 2021, the recommended crops were exhibited to college students in the basic seminar garden, but that did not occur in 2022. In 2023, it will be necessary to review cultivation of recommended crops. Three additional proposals—cultivation trials for selecting recommended crops, work in the exhibition garden by all technicians at the crop production station, and video recording of the growth of exhibited crops—could not be carried out in 2022. Therefore, it was confirmed that in 2023, it will be necessary to conduct cultivation tests for selecting recommended crops and to record videos of the growth of exhibited crops, assuming that as many technicians as possible can work in the exhibition garden.departmental bulletin pape