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Abstract

Data from 228 herds with low NR rates were analysed by computer. The percentage of herds in which low NR rate was attributed to the inseminator, the AI bull, the natural service bull and inaccuracy of oestrus detection was 91, 12, 25 and 6 resp. In 60% of herds, milk yield was considered to have...

Author(s)
O'Gorman, J.; Bourke, S.; Roche, J. F.
Publisher
University College Dublin, Dublin, Irish Republic
Citation
11th International Congress on Animal Reproduction and Artificial Insemination, University College Dublin, Ireland, June 26-30 1988. Volume 3. Brief communications., 1988, Paper No. 278, pp 3pp.
Abstract

Mature Hereford crossbred heifers were treated as follows: (a) progesterone implants for 21 days followed by AI at oestrus (12 females ); (b) progesterone implants for 21 days followed by injection of 400 mu g oestradiol benzoate 20 h after implant removal and insemination at 18 and at 24 h after...

Author(s)
Roche, J. F.
Citation
Journal of Reproduction and Fertility, 1974, 41, 1, pp 223-225
Abstract

Cows and heifers were given a 12-day treatment with an intravaginal coil containing progesterone, with an injection of 5 mg oestradiol benzoate plus 200 mg progesterone when the coil was inserted. The retention rate of coils with a diameter of 5.5 cm was 91% v 84 for 7.0-cm coils (P<0.05). Calving rate was similar in treated cows inseminated (a) at a detected oestrus (53%), (b) 56 + 74 h after coil removal (53%), (c) 56 h after coil removal with injection of 100 mu g GnRH 20 h before insemination...

Author(s)
Roche, J. F.; Prendiville, D. J.; Davis, W. D.
Citation
Veterinary Record, 1977, 101, 21, pp 417-419
Abstract

In a field trial, 1169 postpartum cows were given a 12-day oestrus synchronisation treatment with progesterone-impregnated vaginal coils plus an injection of 200 mg progesterone and 5 mg oestradiol benzoate at the time of coil insertion. The females were (1) inseminated at oestrus, (2) inseminated...

Author(s)
Roche, J. F.; Prendiville, D.; Davis, W. D.
Publisher
An Foras Taluntais., Dublin, Irish Republic
Citation
Irish Republic, Agricultural Institute, Dublin: Animal production. Report from Dunsinea, Moorepark and Western Research Centre. Research report 1976., 1978, pp 34-35
Abstract

Farm trials were conducted with control cows inseminated with frozen semen at oestrus and cows treated with progesterone for 12 days and bred at the ensuing oestrus. Intravaginal silastic coils impregnated with progesterone were used, and an injection of 5 mg oestradiol benzoate and 50 mg...

Author(s)
Roche, J. F.
Citation
Journal of Animal Science, 1976, 43, 1, pp 164-169
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

Blood samples were taken from 48 heifers three times a day during a week before and 20 days after AI. Blood progesterone and LH remained constant for up to 16 days after insemination, whether the heifer was pregnant or not, but between 17 and 20 days the progesterone decreased in non-pregnant...

Author(s)
Roche, J. F.; Ireland, J. J.; Boland, M. P.; McGeady, T. M.
Citation
Veterinary Record, 1985, 116, 6, pp 153-155
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

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

Heifers were given 2 injections of 500 mu g cloprostenol (Estrumate, ICI), 11 days apart, and their reproductive tracts were recovered at slaughter. The percentage of heifers that had ovulated 72, 78, 92 and 96 h after the 2nd injection was 0, 31, 61 and 95 resp. Injection of synthetic LHRH 48 h...

Author(s)
Roche, J. F.
Citation
Veterinary Record, 1977, 100, 22, pp 468-470

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