Plasma hormone levels and reproductive behaviour in anoestrous ewes after treatment with progesterone and PMSG

Cunningham, N. F.; Saba, N.; Boarer, C. D. H.; Hattersley, J. J. P.

doi:10.1530/jrf.0.0600177

Cited by 19 publications

(9 citation statements)

References 13 publications

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“…The effect of treatment on estrus expression was evident when eCG was incorporated into the synchronization protocol which occurred in 75% of ewes not receiving eCG and in 91.7% of ewes when eCG was incorporated. It has been shown that occurrence of estrus in ewes treated with synthetic progestagen in conjunction with eCG varied from 47 to 80% [21] . The absence of estrus in the remaining ewes maybe attributed to inadequate estradiol secretion, maybe reflected by silent estrus since ovulation occurred among all ewes based upon P 4 profiles.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Short or Long Term FGA Treatment with or without eCG on Reproductive Performance of Ewes Bred Out-of-season

Husein¹,

Ababneh²,

Abu-Ruman³

2007

American J. of Animal and Veterinary Sciences

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Abstract:The objective was to evaluate the effects of intravaginal FGA sponges inserted for 4 or 12 days with or without eCG on reproductive performance of ewes out-of-season. Forty-eight anestrous ewes were assigned in equal numbers to four treatments in a 2x2 factorial design. Ewes were administered with FGA sponges on May 17 for 12 days (12-day-FGA-eCG and 12-day-FGA groups, n= 12 each) and on May 25 for 4 days (4-day-FGA-eCG and 4-day-FGA groups, n= 12 each). All treatments were timed to end together on May 29 (day 0, 0 h) at which time sponges were withdrawn and eCG or saline was injected. Five fertile rams which had been isolated from ewes were joined at 0 h for breeding and estrus detection. Blood samples were collected to compare progesterone (P 4 ) concentrations and for pregnancy diagnosis. Overall estrus expression occurred in 40/48 ewes which differed only between 12-day-FGA-eCG and 4-day-FGA (p<0.05) groups. Intervals from 0 h to onset of estrus were shorter (p<0.05) in 12-day-FGA-eCG than those in 12-day-FGA and 4-day-FGA groups with no differences between 12-day-FGA-eCG and 4-day-FGA-eCG or between 12-day-FGA and 4-day-FGA groups. Progesterone levels were basal from day -12 through day 4 (p>0.1) and increased gradually thereafter until day 15. Progesterone remained elevated through day 19 in 11/12, 8/12, 9/12 and 6/12 ewes, respectively, which were diagnosed pregnant on day 30 by ultrasonography. Of the 34 ewes that became pregnant, 31 lambed 150 days following day 0. Pregnancy loss occurred only in 3 ewes from the two groups that did not have eCG treatment No differences in pregnancy and lambing rates and the number of lambs born were found between 12-day-FGA-eCG and 4-day-FGA eCG. The overall pregnancy and lambing rates obtained from mating at first service were 70.8 and 64.6%, respectively. In conclusion, the 4-day-FGA and eCG regimen could adequately replace the 12-day-FGA out-of-season. Application of such a 4-day-FGA protocol must be accompanied by eCG treatment upon sponge removal.

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Section: Resultsmentioning

confidence: 99%

The Effects of Short or Long Term FGA Treatment with or without eCG on Reproductive Performance of Ewes Bred Out-of-season

Husein¹,

Ababneh²,

Abu-Ruman³

2007

American J. of Animal and Veterinary Sciences

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“…Treatment with gestagens (gestagenization) is used as a preparatory procedure before the next stimulation of gonadotropins in many schemes for induction of ovulation and heat in sheep [1,6,8,14]. This approach has a positive effect and when applying the "male effect" [2,18].…”

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confidence: 99%

INFLUENCE of GESTAGENIZATION PROCEDURE on the EWE REPRODUCTIVE PERFORMANCE

Lobachova¹,

Ivanina²

2018

STPJ "Askania Nova"

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The effect of treatment of Ascanian Merino ewe with progesterone (2.5 or 5.0 mg per animal) before beginning of mating period on following display of heat and results of insemination campaign were investigated. Hormone injection improved the ewe ability to conceive at the time of the first showed heat, increased in quantity of animal that displayed heat, fertility and fecundity, but non-significantly reduced in prolificacy. Taking into account the current prices for hormone and the number of additionally received lambs the method is recommended for practical implementation.

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“…Several authors have suggested that there is a need for gonadotropin (eCG) application in order to induce a consistently high mating response (Gordon and Keane, 1967;Foote, 1968;Gordon, 1971). These early reports were supported by the findings of Cunningham et al (1980) and Hamra et al (1989) who observed a poor estrous response (2 of 19 and 1 of 25 in heat, respectively), in progesterone pre-treated ewes not treated with eCG. However, reports also exist that support the hypothesis that ram introduction coincident with progesterone withdrawal may be sufficient to induce fertile estrus in anestrous ewes.…”

Section: Estrous Response To Ecgmentioning

confidence: 55%

“…In support of this hypothesis, Hamra et al (1989), observed only 1 of 25 ewes in heat when rams were joined 2 days after progesterone (CIDR-S) removal, the same group, treated ewes at a comparable time in spring and observed an estrous response of 91% when rams were joined at insert removal. Similarly, analysis of the data presented by Cunningham et al (1980) in which rams were introduced 5 days prior to progesterone removal indicates that less than 10% of progesterone treated ewes showed a gonadotropin surge or exhibited estrus, while 95% of ewes also treated with eCG at progesterone removal showed an LH surge and estrous response. Boland et al (1981) showed that the estrous response and lambing percentage in ewes joined with rams was higher in eCG-treated than non-treated ewes when rams were introduced 48 h after progesterone removal.…”

Section: Estrous Response To Ecgmentioning

confidence: 98%

“…Ram introduction alone at progestogen withdrawal was as effective as gonadotropins in stimulating estrus (Boland et al, 1981;Welch et al, 1984;. Gonadotropins may be required when rams are joined before (Cunningham et al, 1980) or after (Boland et al, 1981;Hamra et al, 1989) progestogen withdrawal, or in artificial insemination protocols if rams are not joined with ewes (Langford et al, 1983;Husein et al, 1998). Ram introduction to raddle marks, h…”

Section: Hours After Insert Removalmentioning

confidence: 99%

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Induction of fertile estrus during seasonal anestrus in ewes and fall born ewe lambs

Knights¹

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Plasma hormone levels and reproductive behaviour in anoestrous ewes after treatment with progesterone and PMSG

Cited by 19 publications

References 13 publications

The Effects of Short or Long Term FGA Treatment with or without eCG on Reproductive Performance of Ewes Bred Out-of-season

The Effects of Short or Long Term FGA Treatment with or without eCG on Reproductive Performance of Ewes Bred Out-of-season

INFLUENCE of GESTAGENIZATION PROCEDURE on the EWE REPRODUCTIVE PERFORMANCE

Induction of fertile estrus during seasonal anestrus in ewes and fall born ewe lambs

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