The effect of melatonin on lambing and litter size in milking ewes after advancing the breeding season with progestagen and PMSG followed by artificial insemination

Laliotis, V.; Vosniakou, A.; Zafrakas, A; Lymberopoulos, A. G.; Alifakiotis, T.

doi:10.1016/s0921-4488(98)00108-4

Cited by 15 publications

(9 citation statements)

References 5 publications

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“…This may be the case when ewes are not induced to cycle during anoestrus. However, when hormonally treated, several studies reported successful induction of oestrus in lactating ewes (Alifakiotis et al, 1982;Laliotis et al, 1998;Abdullah et al, 2002) using progestagen and eCG.…”

Section: Discussionmentioning

confidence: 99%

The effect of breed type and lactation status on reproductive performance in

Kridli¹,

Abdullah²,

Husein³

2010

SA J. An. Sci.

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This study was conducted to evaluate the effect of breed types and lactation status on reproductive performance of hormonally-treated Awassi ewes. A total of 282 ewes were treated with intravaginal progestagen sponges and equine chorionic gonadotropin. Ewes were mated with fertile rams following sponge removal. Lambing rate was similar between brown-and black-faced ewes, while the percentage of multiple births, fecundity and prolificacy were greater in black-faced ewes. Lambing rate and the percentage of multiple births were similar between lactating and dry ewes. Fecundity tended to be greater in lactating ewes, while prolificacy was similar regardless of lactation status. Results of the present study indicate that black-faced Awassi ewes respond better to hormonal treatment than brown-faced ewes while the lactation status does not appear to influence the ewes' response to hormonal treatment. ________________________________________________________________________________

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Section: Discussionmentioning

confidence: 99%

The effect of breed type and lactation status on reproductive performance in

Kridli¹,

Abdullah²,

Husein³

2010

SA J. An. Sci.

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“…Melatonin treatments are reported to improve the reproductive performance of sheep and reduce the lambing period (Abecia et al 2012;Mura et al 2017). They have been widely used to induce oestrus by implanting in the ear for at least 35 days before a planned breeding season (Lalliotis et al 1998;Henderson and Robinson 2000;deNicolo et al 2008). The present experiment was performed to determine whether the short-term application of melatonin alone would improve the reproductive performance of Improved Wallachian ewes compared to commonly used progestogen + gonadotropin treatment.…”

Section: Discussionmentioning

confidence: 99%

Effects of Short-Term Melatonin or Progestogen with Gonadotropic Treatments on Reproductive Performance, Hormonal Levels and Ovarian Activity of Ewes

2022

Int J Vet Sci

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The study compares the effects of short-term application of melatonin alone with a commonly used progestogen + gonadotropin on the reproductive performance, serum hormone concentrations, and ovarian activity of Improved Wallachian sheep. To induce ovarian cyclicity, 382 ewes were allocated into two treatment groups. Ewes of treatment group 1 (n=26) received dietary melatonin (5mg/head/day) for 18 days. Ewes of treatment group 2 (n=356) received intravaginal sponges (FGA, flugestone acetate 20mg) for 12 days followed by injection of eCG (equine chorionic gonadotropin, 500IU i.m.) at the time of sponge withdrawal. Forty-eight hours after sponge or melatonin withdrawal, sheep were exposed to rams, and recorded reproductive performance. Six ewes from each group were selected for hormone assessment and their ovaries removed for histological analysis. Ewes receiving melatonin had lower fertility, fecundity, smaller follicles (0 – <1mm), and lower follicular atresia compared to group 2. In addition, the concentration of progesterone and IGF-I, ovulation rate, and the number of healthy follicles were increased compared to FGA+eCG-treated ewes. Our results indicate that short-term application of melatonin is effective in inducing ovarian cyclicity in ewes with an increased ovulation rate despite low fertility and fecundity.

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“…The possibility of improving the efficacy for oestrus stimulation in sheep using intravaginal gestagencontaining sponges was investigated by additional treatment with melatonin implants. Laliotis et al (1998) described the use of subcutaneous melatonin implants (Regulin, 18 mg) in sheep for 35 days prior to the sponge's insertion. The sheep were then inseminated 48 or 60 h after the sponge was withdrawn.…”

Section: Inducing Oestrus Behaviour During Non-breeding Seasonmentioning

confidence: 99%

Induction and synchronization of oestrus in sheep and goats

Skliarov¹,

Pérez²,

Petrusha³

et al. 2021

JCEA

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Different methods for oestrus induction and synchronization in domestic small ruminants have been developed.Seasonality and female's status are important factors for choosing the most appropriate treatment. In the case of females during breeding season, prostaglandins can be used since functional corpus luteum must be present in the ovaries, while during non-breeding season females should be treated with progesterone-based treatments, accompanied by equine chorionic gonadotrophin (eCG), releasing hormones and other compounds. Significant spread of oestrus synchronization during and after the breeding season has been achieved by the use of intravaginal sponges impregnated with synthetic analogues of progesterone. However, the effect of hormonal drugs on the female reproductive system may manifest differently depending on the initial functional state of reproductive organs and the hormonal status, and negative consequences can be observed when drugs are wrongly administered. In addition, insufficient knowledge about the patterns of change in the reactivity of the nervous sexual centers and the corresponding reactions of the body to the administration of hormones reduces their effectiveness, which limits the widespread use. In general, the induction and synchronization of oestrus in small ruminants is an currently important direction of scientific research and an urgent problem of sheep and goat breeding, but the proposed methods require further improvement by reducing the costand increasing biosecurity and predictability of the result.

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The effect of melatonin on lambing and litter size in milking ewes after advancing the breeding season with progestagen and PMSG followed by artificial insemination

Cited by 15 publications

References 5 publications

The effect of breed type and lactation status on reproductive performance in

The effect of breed type and lactation status on reproductive performance in

Effects of Short-Term Melatonin or Progestogen with Gonadotropic Treatments on Reproductive Performance, Hormonal Levels and Ovarian Activity of Ewes

Induction and synchronization of oestrus in sheep and goats

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