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Abstract

The pregnancy rate in 321 Friesian dairy replacement heifers following two inseminations at fixed times was no different when oestrus was synchronized with either a 12-day progesterone treatment using silastic coils or a double injection regimen of a synthetic analogue of prostaglandin F2 alpha...

Author(s)
Roche, J. F.
Citation
Veterinary Record, 1976, 99, 10, pp 184-186
Abstract

Oestrus and the time of ovulation were controlled in 87 mature, non-pregnant heifers by using silastic implants of MGA followed by an injection of HCG 48 h after removal of the implants. The heifers were allocated at random to 3 groups and inseminated with frozen semen before the estimated time of...

Author(s)
Roche, J. F.; Crowley, J. P.
Citation
Journal of Reproduction and Fertility, 1973, 35, 2, pp 211-216
Abstract

Trials were carried out on 1184 dairy cows which had calved at least 6 wk before treatment, and on 255 heifers, to determine the effectiveness of cloprostenol to control oestrus. In trial 1, following 2 injections of cloprostenol given 12 days apart, there was no difference in calving rate...

Author(s)
Roche, J. F.; Prendiville, D. J.
Citation
Theriogenology, 1979, 11, 2, pp 153-162
Abstract

After treatment for 12 days with a PRID (progesterone-releasing intravaginal device) having a capsule containing 10 mg oestradiol benzoate attached, 42 out of 82 Friesian cows calved to AI 56 h after PRID removal, and 36 out of 72 calved to double AI at 56 + 74 h; corresponding results for cows...

Author(s)
Roche, J. F.
Publisher
Dublin., Irish Republic
Citation
Irish Republic, Agricultural Institute, Dublin: Animal production. Report from Dunsinea, Moorepark and Western Research Centres. Research report 1977., 1979, pp 36-37
Abstract

In a trial involving 1090 Friesians, the cows were inseminated once at oestrus detected during a 24-day observation period or 52, 56 or 60 h after removal of a progesterone-releasing intravaginal device to which was attached a capsule containing 10 mg oestradiol benzoate. Calving rate for the 4...

Author(s)
Roche, J. F.; Prendiville, D. J.; O'Leary, S.
Publisher
Dublin., Irish Republic
Citation
Irish Republic, Agricultural Institute, Dublin: Animal production. Report from Dunsinea, Moorepark and Western Research Centres. Research report 1977., 1979, pp 37
Abstract

181 cows were inseminated after a 12-day treatment with a PRID (progesterone-releasing intravaginal device); the used coil was re-inserted into 89 of them 16 days after AI, and was left in place for 7 days. For the group given 1 PRID treatment, the number of repeat oestrous periods observed on days ...

Author(s)
Roche, J. F.
Publisher
Dublin., Irish Republic
Citation
Irish Republic, Agricultural Institute, Dublin: Animal production. Report from Dunsinea, Moorepark and Western Research Centres. Research report 1977., 1979, pp 38-39
Abstract

In a field trial involving 469 cows, calving rates were similar for cows inseminated at oestrus detected during a 24-day observation period (49%), cows given 2 injections of cloprostenol 12 days apart and inseminated at a detected oestrus (45%), and cows double-inseminated 72 + 96 h after the 2nd...

Author(s)
Roche, J. F.; Prendiville, D. J.
Publisher
Dublin., Irish Republic
Citation
Irish Republic, Agricultural Institute, Dublin: Animal production. Report from Dunsinea, Moorepark and Western Research Centres. Research report 1977., 1979, pp 39-40
Abstract

The calving rate to AI following administration of progesterone or prostaglandin was significantly influenced by ovarian activity at the start of the treatment. The calving rate of animals with ovaries classified at the start of treatment as inactive was 19% v 78 for those with active ovaries....

Author(s)
Roche, J. F.; Prendiville, D. J.
Citation
Veterinary Record, 1978, 102, 1, pp 12-14
Abstract

The reasons for a reduced oestrous response in heifers following a 9-day treatment with implants of progesterone were determined. Progesterone implants were inserted into Hereford cross heifers for 9 days at different stages of the oestrous cycle. Oestradiol benzoate (5 mg) was also given at the...

Author(s)
Roche, J. F.
Citation
Journal of Reproduction and Fertility, 1974, 40, No.2, pp 433-440
Abstract

33 Hereford crossbred heifers were allotted at random to treatments at each of 3 stages (days 7-11, 12-16 and 17-20) of the oestrous cycle: (1) untreated controls; (2) 30 mg and (3) 20 mg PGF2 alpha injected intramuscularly. Females were checked (with a vasectomised bull) for the occurrence of heat ...

Author(s)
Roche, J. F.
Citation
Journal of Reproduction and Fertility, 1974, 37, 1, pp 135-138

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