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Abstract

Blood samples were collected throughout the oestrous cycle from 5 Landrace gilts and 2 multiparous Landrace sows. The duration of the plasma LH preovulatory surge ranged from 1 to 5 days (mean 2.6±0.36). Females accepted the ♂ on the day of the LH surge. The correlation between duration of LH surge ...

Author(s)
Niwa, T.; Kanematsu, S.; Yanaka, T.; Hashizume, T.; Yamanaka, H.
Citation
Bulletin of the Laboratory of Artificial Insemination, Iwate University, 1981, No. 2, pp 25-32
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