New trends in the control of reproduction in the bovine

Mauléon, P.

doi:10.1016/0301-6226(74)90052-9

Cited by 31 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The earliest form of implant was the silicone rubber progestagen-impregnated device (Dziuk and Cook, 1966). The recent use of a miniature implant of hydron polymer, impregnated with an extremely potent progestagen (6 to 12 mg SC-21009; G. D. Searle) has given encouraging results in oestrous control in cattle (Mauleon, 1974;Wishart and Young, 1974). However, in using these implants over the period of a year at UCD, it was not possible to match the speed and simplicity of the intravaginal approach.…”

Section: Methods Of Hormone Control Availablementioning

confidence: 99%

Hormonal control of reproduction in sheep

Gordon

1975

Proc. Br. Soc. Anim. Prod (1972)

View full text Add to dashboard Cite

In summer 1973, the sheep farmer in most parts of the Irish Republic could telephone his local cattle Artificial Insemination (AI) station and ask for a technician to treat his ewes for ‘early-lamb’ (December/January) production with intravaginal sponges and pregnant mare's serum gonadotrophin (PMSG). The 60 p per ewe service, which first became available at that time, covered two visits by the technician: the first to insert sponges; the second, 14 days later, to withdraw them and administer the gonadotrophin. On the basis of considerable experimental evidence, the farmer could expect about 60 to 70% of ewes treated to conceive to first services and lamb within a short period of each other, and some 80% to produce offspring to the combined first and second services. The scheme, based on natural service, was used by several hundred farmers in that first year of operation, and was made available on a similar basis again in 1974. The introduction of this cheap, effective and simple technique for the hormonal control of reproduction in sheep was the result of considerable activity over the years by Dr Sean Crowley and his staff in An Foras Taluntais and various workers in University College, Dublin (UCD). Due credit must be given, however, to the Irish Department of Agriculture, which sponsored extensive field testing of controlled breeding techniques in 197/172, and subsequently arranged with cattle AI stations to provide countrywide coverage on a fee per ewe basis from 1973.

show abstract

Section: Methods Of Hormone Control Availablementioning

confidence: 99%

Hormonal control of reproduction in sheep

Gordon

1975

Proc. Br. Soc. Anim. Prod (1972)

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Successful alleviation of post-partum anoestrus in French breeds with progestagen implants and PMSG has been reported by Mauleon (1974).…”

Section: Introductionmentioning

confidence: 99%

Effect of progestagen intravaginal sponges and PMSG on synchronisation of oestrus in maiden heifers and on interval from calving to oestrus in beef cows

Moore¹,

Smith

1980

New Zealand Journal of Experimental Agriculture

View full text Add to dashboard Cite

The effectiveness of progestagen sponges plus PMSG in inducing and synchronising oestrus and pregnancy in nulliparous heifers was assessed. Eighty-one percent of the treated heifers were synchronised, but none of the controls. The hormone treatment advanced the mean calving date by 19 days, but there was no difference between treated and control in the percentage of heifers that finally calved. The interval between calving and first oestrus for hill-country beef cows 2-10 years old in an untreated control group was 94 days, in a group treated with progestagen-impregnated sponges for 21 days was 98 days, and in a group treated with these sponges plus 1000 i. u. of PMSG at the time of withdrawal was 85 days. The last treatment reduced post-par tum anoestrus by 11 days in comparison with the mean of the other two treatments (P < 0.01). There was no difference between age groups in the percentage of cows showing oestrus, conceiving to first service, and calving for the control treatment. However, in the two hormone treatments none of the 2-year-old cows conceived to first oestrus and 13% calved, but 46% of cows in the older age groups cor1Ceived to first oestrus and 79% calved.

show abstract

New trends in the control of reproduction in the bovine

Cited by 31 publications

References 12 publications

Hormonal control of reproduction in sheep

Hormonal control of reproduction in sheep

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

Effect of progestagen intravaginal sponges and PMSG on synchronisation of oestrus in maiden heifers and on interval from calving to oestrus in beef cows

Contact Info

Product

Resources

About