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Abstract

THE authors designed a new artificial vagina for the boar (Zootechnical Experiment Station Type) in 1939. The best method for collecting boar's semen is by the use of a dummy and an artificial vagina. The average duration of ejaculation is 6 mins. 36 secs. (2 mins. to 23 mins. 35 secs.). As the...

Author(s)
ITO, S.; NIWA, T.; KUDO, A.
Citation
Research Bulletin. zootech. Exp. Stn., 1948, 55,
Abstract

In order to determine the correct amount of semen to be used in the artificial insemination of pigs, 283 experiments with 232 sows were made. The volume of semen normally necessary for successful conception was estimated to be 50 em.3; where the sperm concentration was high and the semen had been...

Author(s)
ITO, S.; NIWA, T.; KUDO, A.
Citation
Japanese Journal Zootechnical Science, 1949, 19, pp 113
Abstract

THE minimum quantity of semen normally required for conception is 50 cm.3, but if the semen is of high sperm density and stored for less than 24 hrs., 30 cm.3 will be sufficient. The number of spermatozoa necessary for conception is, in the case of under 24 hours' storage, 5 billion; when stored...

Author(s)
ITO, S.; NIWA, T.; KUDO, A.
Citation
Research Bulletin. zootech. Exp. Stn., 1948, 55,
Abstract

THE quantity of semen per ejaculate is 225.7 (65-680) cm.3, 178.8 (38-580) cm.3 being liquid and 46.9 (10-205) g. gelatinous. The pH of fresh semen is 6.4-7.4 and the sp. gr. 1.0075-1.025. The temperature of freshly ejaculated semen is lower than the body temperature by 0.3°-4.1° C. The volume of...

Author(s)
ITO, S.; NIWA, T.; KUDO, A.; MIZUHO, A.
Citation
Research Bulletin. zootech. Exp. Stn., 1948, 55,