Control of oestrous cycles of heifers with a synthetic prostaglandin analogue

Cooper, M. J.

doi:10.1136/vr.95.10.200

Cited by 123 publications

(30 citation statements)

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“…PG is an effective luteolysin (Cooper, 1974), and when administered to heifers at PRID insertion on Day 10, the resulting plasma progesterone levels were almost identical to those observed in heifers treated with PRID alone on Day 3 in Exp. 1 (see (Smith et al, 1984).…”

Section: Discussionmentioning

confidence: 84%

“…Oestrogens have been shown to possess both luteolytic and luteotrophic properties when given alone, or in association with progestagens (Wiltbank, 1966;Lemon, 1975) and oestradiol benzoate has been used with PRIDs to improve synchronization of oestrus (Roche, 1978). Prostaglandins have also been shown to be effective luteolysins (Cooper, 1974) and have been used to improve the synchronization of oestrus after short treatments with a PRID (Roche, 1976;Hansel & Beai, 1979 Neill, Johansson, Datta & Knobil (1967) and incorporating the modifications of Johansson (1969).…”

Section: Introductionmentioning

confidence: 99%

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Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer

Munro¹,

Moore²

1985

Reproduction

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Section: Discussionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer

Munro¹,

Moore²

1985

Reproduction

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“…An example of these materials are the preparations of the English firm ICI, originally termed ICI 79939 and ICI 80996. Cooper (1974) demonstrated that 0.5 mg of the material ICI 80996, applied i. m. to cattle, is sufficient to cause a luteolytic effect. Cooper andFurr (1974), Lamming et al (1975), Elving et al (1975), Moore (1975), Hafs (1976), Kudlal!…”

Section: Synchronization Of Estrus Prostaglandins Factors Influencimentioning

confidence: 99%

“…They recommend the use of PG and their synthetic analogues only in animals with an easily palpable corpus luteum, corresponding to the 6th -16th or 18th day of the cycle. In an attempt to bridge the period of the cycle, when the corpora lutea on the ovarium are not sensitive to the application of PG, and to avoid the necessity of controlling the state of the ovaries in cycling animals, Cooper (1974), Hafs et a1. (1975) have recommended treatment twice in succession within 10-12 days.…”

Section: Synchronization Of Estrus Prostaglandins Factors Influencimentioning

confidence: 99%

Some Factors Influencing the Results of Conception in Cows and Heifers in Estrus Synchronized by the Synthetic Analogue of PGF2α Cloprostenol

Vinkler¹,

Kudlác²,

Jiříček³

1982

Acta Vet. Brno

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A study of the contribution of the breeding bull, the work of the operator and the influence of the size of the synchronized group on the conception rate in breeding cows after a first insemination at estrus, synchronized by cloprostenol, in 21 groups of heifers, of 469 head, and 21 groups of cows (350 head), has shown that:1. Conception rate in breeding cows after a first insemination during synchronized estrus was significantly influenced by the use of a bull allotted according to a mating plan. After insemination of the breeders, carried out with frozen semen from various bulls, statistically highly significant differences in conception after the 1st insemination (P < 0.01) were ascertained.2. The conception rate in breeding cows after a 1st insemination were influenced by the work of the operators. Amongst the individual techniques, statistically highly significant differences (P < 0.01) were found in the attained conception.3. Conception rates in breeding cows were also strikingly influenced by the size of the synchronized group. A decrease in conception of 18 %'(at the limit of statistical significance) was ascertained after a 1st insemination when there were more than 30 heifers in the synchronized group, and a statistically highly significant decrease of 25 % (P < 0.01) was found when there were more than 40 heifers to a group in inseminations carried out by a sole operator. In cows a decrease of 8 % in a conception was found after a first insemination in groups with a number of breeders larger than 40 head.

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“…Because of the extensive nature of beef cattle management and the high labour input required for oestrous detection and insemination with beefcows nursing calves, there is a need for a practical and satisfactory system for the synchronisation of oestrus. Such systems for beef cattle include intravaginal administration of progesterone accompanied by an injection of pregnant mares serum gonadotrophin (pMSG) (Mauleon et al 1978;Mulvehill & Sreenan 1978), subcutaneous administration of a synthetic progestagen in an ear implant (Mauleon 1974;Wishart & Young 1974;Wiltbank & Gonzalez-Padilla 1975), and intramuscular injections of prostaglandin F 2a or its analogs (Welch et al 1975;Cooper 1974;Hafs et al 1978). Few reports have compared each of these different techniques under similar conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of techniques for synchronisation of oestrus and subsequent fertility in beef cattle

Smith¹,

Kaltenbach²

1990

New Zealand Journal of Agricultural Research

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One hundred and seventy-eight heifers and 275 suckling cows were allocated to either a control (untreated) group or to one of three groups treated to synchronise oestrus. The treatments were eitheraprogestagen ear implant (SMB),aprogesterone intravaginal device (pRIO + PMSG), or two injections ofaprostaglandin analogue (pG). Progestagen treatments effectively synchronised oestrus with similar numbers ofanimals exhibiting oestrus within 2 days of treatment, as were observed over 21 days in the control group. The prostaglandin treatment was much less effective (control 79%, 5MB 72%, PRID + PMSG 71%, andPG 45%). Conception to timed insemination in the 5MB-and PGsynchronised heifers was lower than that obtained in the other treatments (control 33%, 5MB 17%,PRID + PMSG 33%, and PG 25%). In the suckling cows the conception rates of the progestagen-treated groups (48 and 50%) were better than that following PG (20%) with the controls (37%) intermediate. Plasma progesterone levels indicated that anoestrus was not the majorreason for the poor performance of the PGtreated cows. An additional group of 36 cows treated with progestagen and PMSG before Day 30 postpartum indicated some advantage from this procedure in reducing the interval from calving to A90039 Received 26 March 1990; accepted 20 June 1990 conception. Techniques based on the administration ofprogestagens appear to offer a practical means of synchronisingoestrus for artificial insemination (AI) in suckling beef cows.

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Control of oestrous cycles of heifers with a synthetic prostaglandin analogue

Cited by 123 publications

References 0 publications

Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer

Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer

Some Factors Influencing the Results of Conception in Cows and Heifers in Estrus Synchronized by the Synthetic Analogue of PGF2α Cloprostenol

Comparison of techniques for synchronisation of oestrus and subsequent fertility in beef cattle

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