Effect of melatonin treatment on semen parameters and endocrine function in Black Racka rams out of the breeding season

Egerszegi, I.; Sarlós, P.; Rátky, J.; Solti, L.; Faigl, V.; Kulcsár, Margit; Cseh, Sándor

doi:10.1016/j.smallrumres.2013.11.001

Cited by 28 publications

(35 citation statements)

References 36 publications

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“…Although TD increased significantly in both Kivircik and Charollais rams, their size did not significantly differ between both breeds. In this study, the changes of SC and TD dimensions in Kivircik rams were similar to that reported by Egerszegi et al (2014); Endale et al (2009) and Rosa et al (2012). Whereas SL and TD dimensions in the melatonin-treated Charollais rams were higher than that by Kridli et al (2007); Kridli et al (2006) and Egerszegi et al (2014).…”

Section: Discussionsupporting

confidence: 89%

“…Pre-copulatory behaviour in rams reflects their underlying sexual motivation. This means that the higher the frequency of precopulatory behaviour, the greater the frequency of other sexual activities (mounting and mating) (Egerszegi et al, 2014;Kridli et al, 2006;Sarlos et al, 2013). According to the study results, most sexual performance parameters were better in Charollais compared with the Kivircik males.…”

Section: Discussionmentioning

confidence: 82%

“…Sperm production is correlated to testicular measurements. Scrotal circumference will vary with season and body weight, but should be at its maximum peak during the fall breeding season (Egerszegi et al, 2014;Faigl et al, 2009;Palacin et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Treatment with melatonin during non-breeding season can revert the 'long-day effect' over the ram (Faigl et al, 2009;Rosa et al, 2012;Zuniga et al, 2002). In mature rams, the insertion of melatonin implants facilitated testicular growth with an elevated testicular size, sexual behaviour and improved semen characteristics in different breeds (Casao et al, 2010;Chemineau et al, 1996;Egerszegi et al, 2014). The treatment of rams with melatonin between the middle and the end of spring accelerated the seasonal increase in LH and testicle size and increased the proportion of ewes that ovulated in response to the introduction of a ram (Palacin et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of sexual performance and testicular characteristics of melatonin treated Kivircik and Charollais rams during the non-breeding season

Çevik

Yilmazer

Koçyiğit

2017

Arq. Bras. Med. Vet. Zootec.

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This study was conducted to investigate the effects of melatonin implantation on basic testicular characteristics and reproductive performance of Kivircik and Charollais rams and ewes during the nonbreeding season. In this study, 8 Kivircik and 6 Charollais rams were used. Rams were implanted with 54 mg melatonin according to the manufacturer's instructions. At melatonin implantation and at ram introduction the reproductive performance and testicular characteristics were evaluated. Throughout the experimental period, rams were permanently kept outdoors under conditions of natural day length and at ambient temperature. The effects of exogenous melatonin treatments on the reproductive performances of rams and ewes, estrus response, pregnancy rate, litter size and twinning rate of ewes were evaluated in all groups. Libido values were significantly higher in Charollais rams compared to Kivircik rams (P<0.001). Testicular volume (TV) was increased in both ram breeds. Scrotal length (SL) was also increased in both Kivircik and Charollais rams (P<0.01). In conclusion, we showed that the treatment of rams with slow release melatonin implants increased scrotal diameters and testicular volumes in both Kivircik and Charollais rams. Furthermore, melatonin implantation improved the reproductive performances of ewes naturally mated with these melatonin implanted rams during non-breeding season.Keywords: ram, melatonin, fertility, non-breeding season RESUMO Esse estudo foi conduzido para investigar os efeitos de implantação de melatonina em características testiculares básicas e desempenho reprodutivo de carneiros Kivircik e Charollais durante a estação não reprodutiva. Nesse estudo, oito carneiros Kivircik e 6 Charollais foram utilizados. Foi implantado 54 mg de melatonina nos cordeiros de acordo com as instruções do produtor. Ao implantar a melatonina e à introdução

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of sexual performance and testicular characteristics of melatonin treated Kivircik and Charollais rams during the non-breeding season

Çevik

Yilmazer

Koçyiğit

2017

Arq. Bras. Med. Vet. Zootec.

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“…In our study, our 1-yearold rams had not reached their full reproductive potential and therefore they did not exhibit an adequate sexual behaviour (frequency of mounts and ejaculation). Age of the ram should be taken into account, since studies evaluating 2 and 3-year-old hair and wool rams demonstrated that they have a better sexual behaviour and can induce the oestrous in a greater percentage of acyclic wool ewes, than 1-year-old rams (Emsen, 2005;Simitzis et al, 2006;Kridli et al, 2008;Ungerfeld et al, 2008;Egerszegi et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

Changes in Sexual Behaviour and Semen Quality Associated with Age and Type of Enclosure of Saint Croix Rams in Different Seasons of the Year

Santos

Sánchez-Dávila

Vázquez-Armijo

et al. 2015

Italian Journal of Animal Science

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The objective of this study was to evaluate sexual behaviour and semen quality of St. Croix ram lambs bred in a semi-desert region. In Experiment 1, 24 yearling rams were assigned to two groups: T1 with 12 males confined for 11 months; T2 with 12 males confined individually for the same period of time. In Experiment 2, 20 four-month-old ram lambs were assigned to two groups of 10 animals each. In each experiment, sexual behaviour and semen quality were evaluated every 2 weeks over 11 months. In Experiment 1, rams that were individually confined showed better sexual activity than lambs confined together (P<0.05), whereas in Experiment 2 ram lambs confined individually only showed shorter time to first mount with ejaculation (P<0.05). In experiment 1, sperm with better progressive motility (P<0.05) was recorded per yearling ram confined individually (63.4±0.2%) in comparison with rams confined together (51.60.1%). In Experiment 2, ram lambs confined together showed better semen quality (P˂0.05). In both trials, an effect of the season was observed on both sexual behaviour and semen quality (P<0.05). In conclusion, this study of St. Croix males showed different sexual behaviours according to age and type of enclosure.

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Reproductive performance of hair ewes and rams implanted with melatonin previous to the anestrus season in northwest Mexico

Leyva-Corona

Angulo-Valenzuela

Laborin-Escalante

et al. 2023

Trop Anim Health Prod

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Ovine reproductive behavior depends on annual photoperiodic cycle and its impact on endogenous melatonin secretion. In this regard, exogenous melatonin administration previous to the physiological anestrus period could modify the reproductive performance of sheep. Two independent studies were performed to evaluate such hypothesis in hair sheep implanted with melatonin prior to the anestrus season in northwest Mexico. Study 1 involved 15 rams assigned to one of three treatments receiving 0mg (n=5), 18mg (n=5) or 36mg (n=5) of melatonin subcutaneously. Study variables were measured monthly since implantation (d0) and included testosterone concentration, scrotal circumference, mass motility, individual motility, and sperm concentration. Study 2 included 50 ewes assigned to one of two treatments receiving 0mg (n=25) or 18mg (n=25) of melatonin subcutaneously. In ewes, progesterone concentration and the frequency of females in anestrus were measured during the implantation (-30d), as well as at the beginning (0d) and at the end (45d) of the mating period, while pregnancy rate was determined by ultrasonography 45d after. Continuous variables were analyzed using a mixed effects model considering treatment, time, and the treatment by time interaction as xed effects. Animal nested within treatment was the random effect. Binary variables were analyzed using the chi-square test. In males, melatonin improved testosterone and sperm concentrations (P<0.05), while in females, a 28% higher pregnancy rate was observed in implanted ewes (P<0.05). Although melatonin enhanced reproductive parameters in both sexes, its exogenous administration previous to the anestrus season in northwest Mexico could be more bene cial and cost effective in rams.

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Effect of melatonin treatment on semen parameters and endocrine function in Black Racka rams out of the breeding season

Cited by 28 publications

References 36 publications

Comparison of sexual performance and testicular characteristics of melatonin treated Kivircik and Charollais rams during the non-breeding season

Comparison of sexual performance and testicular characteristics of melatonin treated Kivircik and Charollais rams during the non-breeding season

Changes in Sexual Behaviour and Semen Quality Associated with Age and Type of Enclosure of Saint Croix Rams in Different Seasons of the Year

Reproductive performance of hair ewes and rams implanted with melatonin previous to the anestrus season in northwest Mexico

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