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Abstract

The accuracy of diagnosis was 97.1 and 100% for 182 sows examined ≥21 and ≥36 days resp. after mating. The method of examination is described, and the criteria for early diagnosis based on palpation of the middle uterine artery, cervix, ovaries and uterus, and the appearance of the vulva, are...

Author(s)
Sawada, M.; Niwa, T.
Citation
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 33-42
Abstract

Biopsies were carried out at intervals of 2-3 days in cycling and pregnant sows. The degree of stratification of the vaginal epithelium is given in 4 graphs. It increased greatly at oestrus. During pregnancy, the vaginal epithelium had 3-4 layers of cells.

Author(s)
Hayashi, T.; Niwa, T.
Citation
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 43-47
Abstract

Sows were injected with PGF analogue on days 111, 112 or 113 of pregnancy in an experiment involving 81 treated and untreated animals. The level of progesterone in the blood was determined in 4 treated sows. Compared with untreated controls, treatment significantly advanced the date of...

Author(s)
Niwa, T.; Suginome, Y.; Hashizume, T.
Citation
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 48-59
Abstract

The progesterone concentrations were determined in 5 cows in oestrus, 5 cows in the luteal phase of the cycle, and 16 cows at 20-62 days after mating. In blood plasma, morning milk and evening milk, the progesterone concentration (±standard deviation) averaged 0.63±0.13, 2.8±0.2 and 3.4±0.6 ng/ml...

Author(s)
Hashizume, T.; Niwa, T.; Kimura, H.
Citation
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 60-65
Abstract

IV. Eleven ♀♀ were given 10 mg. progesterone daily for 6-13 days during the breeding season. Oestrus occurred 2-3 days after withdrawal of treatment and lasted for 10.5-3 days. Two ♀♀ were superovulated with PMS+HCG and inseminated; ova were recovered 3 days after insemination from the excised...

Author(s)
NISHIKAWA, Y.; HORIE, T.; SUGIE, T.; ONUMA, H.; NIWA, T.
Citation
Proceedings of the Japan Academy, 1963, 39, pp 758-763
Abstract

III. Eleven ♀ goats, superovulated with PMS + HCG, were killed 2-3 days after ovulation. 99 ova were recovered from the oviducts and 7 from the uterine horns. In a similar ♀, killed 4 days after ovulation, 4 ova were found in the uterus and none in the oviduct. 25 superovulated ♀♀ were inseminated...

Author(s)
NISHIKAWA, Y.; HORIE, T.; SUGIE, T.; ONUMA, H.; NIWA, T.
Citation
Proceedings of the Japan Academy, 1963, 39, pp 671-676
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,