Effectiveness of exposure to longday followed by melatonin treatment on semen characteristics of Damascus male goats during breeding and non-breeding seasons

Ramadan, Tamer; Taha, Taha A.; Samak, M. A.; Hassan, A.

doi:10.1016/j.theriogenology.2008.07.029

Cited by 36 publications

(37 citation statements)

References 34 publications

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“…Basal testosterone level was significantly higher in the MT group on days 49 and 71, which reflects the expected effect of long-term melatonin treatment, in accordance with previous studies (Pelletier and Ortavant, 1975a, b;Kennaway and Gilmore, 1985;Lincoln and Ebling, 1985;Kaya et al, 2001;Tsantarliotou et al, 2008;Ramadan et al, 2009). The novelty value of our experiment, apart from the breed and the weather, is the testosterone challenge.…”

Section: Acta Veterinaria Hungarica 57 2009supporting

confidence: 91%

“…In short-day breeders, longer dark period and elevated plasma mela- tonin level indicate the beginning of the breeding season. Melatonin triggers GnRH secretion in the mediobasal hypothalamus and thus leads to increased FSH and LH secretion, which results in an elevated testosterone response (Pelletier and Ortavant, 1975a,b;Chemineau et al, 1992;Kokolis et al, 2000;Tsantarliotou et al, 2008;Ramadan et al, 2009). These observations led to the development of long-acting (slow-release) melatonin devices which are able to stimulate reproductive activity before the natural breeding season.…”

Section: Discussionmentioning

confidence: 99%

“…These observations led to the development of long-acting (slow-release) melatonin devices which are able to stimulate reproductive activity before the natural breeding season. Numerous studies have demonstrated the beneficial effect of melatonin treatment in rams and bucks on sexual behaviour, libido, ram effect, size of testicles, sperm characteristics and production, sperm quality indicated by cryosurvival, acrosin activity, activity of plasminogen activator and inhibitor of spermatozoa and plasmin inhibition, which might indicate changes in the fertilising ability of spermatozoa (Lindsay et al, 1984;Lincoln, 1994;Rosa et al, 2000;Kaya et al, 2001;Casao et al, 2008;Ramadan et al, 2009). However, most of these works were performed under Mediterranean latitudes with less seasonal photoperiodic circumstances.…”

Section: Discussionmentioning

confidence: 99%

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Testicular function and semen characteristics of Awassi rams treated with melatonin out of the breeding season

Faigl

Keresztes

Kulcsár

et al. 2009

Acta Veterinaria Hungarica

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The objective of this study was to evaluate the effect of long-term melatonin treatment applied during the non-breeding season on semen characteristics, endocrine function of testicles and baseline level of insulin-like growth factor-I (IGF-I) in Awassi rams kept in the temperate continental zone of Europe and used as semen donors in an artificial insemination (AI) programme. On 23 February (day 0), slow-release melatonin implants were inserted subcutaneously into rams (n = 8). Control animals (n = 8) received no treatment. In both groups, basic semen parameters (concentration, total motility, fast and slow forward motility, morphology), GnRH-induced testosterone response and basal IGF-I concentration were evaluated on days 0, 47 and 71. No differences were found in concentration of spermatozoa, total motility, and numbers of spermatozoa with fast and slow progressive motility and normal/abnormal morphology between the melatonintreated and the control group. However, in melatonin-treated animals, basal and GnRH-induced testosterone levels were slightly elevated on day 47 and became significantly higher on day 71 (P < 0.05) as compared to controls. There was no difference in plasma IGF-I levels between the groups. In conclusion, slow-release melatonin applied during the non-breeding season improves testicular testosterone production but does not influence the semen characteristics and the IGF-I level of semen donor Awassi rams used in an AI programme and kept in the temperate continental zone of Europe.

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Section: Acta Veterinaria Hungarica 57 2009supporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Testicular function and semen characteristics of Awassi rams treated with melatonin out of the breeding season

Faigl

Keresztes

Kulcsár

et al. 2009

Acta Veterinaria Hungarica

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“…It is suggested that the effect of melatonin on the reduction of unsaturated fatty acids is similar to that of vitamin E in rearranging the structure of sperm membrane fatty acids and may result in a greater stability of fatty acids to lipid peroxidation (Surai 1999). In addition, melatonin can also induce its antioxidant effects through the strengthening of antioxidant enzymes activities by increasing the gene expression of SOD and GSH-Px in the sperm membrane (Ramadan et al 2009). So increasing the activity of antioxidant enzymes in rooster spermatozoa might be the second suggestion for decreasing lipid peroxidation during the storage.…”

Section: Discussionmentioning

confidence: 99%

Preservation effects of melatonin on the quality and fertility of native Fars rooster semen during liquid storage

Meamar¹,

Shahneh²,

Zamiri³

et al. 2016

CZECH J ANIM SCI

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Liquid or frozen storage of poultry semen negatively affects the sperm motility and has crucial role in reducing fertility. Phospholipids in chicken sperm membrane are composed of high proportions of polyunsaturated fatty acids which are susceptible to lipid peroxidation. One of possible ways to improve semen quality is supplementing the ration with antioxidant compounds such as melatonin. In this study, seventy-two roosters were randomly divided into three equal groups. The first group (control; Group C) was exposed to 14 h light and 10 h darkness. The second group (Group M) was exposed to the same lighting period, but in combination with melatonion supplementation (3 mg/kg body weight daily). The third group (Group L) was exposed to 24 h constant light. Semen was collected using abdominal massage and stored for 6 and 12 h at 5°C. Motility, viability, malondialdehyde (MDA) concentration, fertility, and hatchability were evaluated before and after storage. The results showed that the percentage of viable and motile sperms was significantly (P < 0.05) decreased in the control samples after 6 h storage but in Group M these parameters were significantly (P < 0.05) decreased after 12 h. The MDA concentration was significantly (P < 0.05) decreased in Group M compared with Group C after 6 and 12 h storage. The sperm membrane lipid analysis showed that the percentage of unsaturated fatty acids in Group M was significantly (P < 0.05) lower than in Group C. Fertility and hatchability did not change significantly (P < 0.05) both in M and L Groups compared with C Group. Melatonin administration improved semen quality and decreased lipid peroxidation during liquid storage. It also reduced the percentage of polyunsaturated fatty acids in the sperm membrane lipid composition but it did not affect fertility and hatchability.

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“…For example, Angora bucks show marked seasonal variations in their libido and testicular size with a peak in autumn (Ritar, 1991). By contrast, Australian cashmere, Damascus and Rayini male goats display a moderate reproductive seasonality (Walkden-Brown et al, 1994;Zamiri and Heidari, 2006;Ramadan et al, 2009). In cashmere goats, the breeding season, characterized by high levels of LH and testosterone, as well as the emission of a strong odor, begins in late spring and ends in late autumn (Walkden-Brown et al, 1994).…”

Section: Subtropical Climatic Conditions and Description Of The Goat mentioning

confidence: 99%

Environmental and social cues can be used in combination to develop sustainable breeding techniques for goat reproduction in the subtropics

2011

Animal

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Goat breeds from subtropical latitudes show different annual reproductive cycles. Some of them display large seasonal variations in their annual breeding season, while others display a moderate seasonality or sexual activity all year round. This reproductive seasonality causes seasonality of milk, cheese and meat productions and, as a consequence, induces wide variation in producer incomes. To solve this problem and provide methods allowing producers to breed animals during the anestrous period and stabilize production all year round, it is necessary to have a deep knowledge of their annual sexual activity and to identify the environmental factors controlling the timing of the annual reproductive cycle. Then, it is possible to build on these knowledge sustainable breeding techniques adapted to the environmental, economic and social characteristics of the local breeding system. In this review, I will illustrate this strategy through the example of our experiments in subtropical goats. First, we determined the characteristics of the annual breeding season in both male and female goats. Second, we identified the photoperiod as the major environmental factor controlling the timing of this annual breeding season. Third, we used the photoperiod to stimulate indirectly the sexual behavior of does. Indeed, we used photoperiodic treatments to stimulate the sexual activity of bucks during the non-breeding season. These sexually active male goats were then used to induce and synchronize the estrous behavior and ovulatory activity of anestrous females in confined or grazing conditions by using the 'male effect'. Under subtropical conditions, these results constitute an original manner to control the reproductive activity of local goats using the photoperiod combined with the 'male effect.'

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Effectiveness of exposure to longday followed by melatonin treatment on semen characteristics of Damascus male goats during breeding and non-breeding seasons

Cited by 36 publications

References 34 publications

Testicular function and semen characteristics of Awassi rams treated with melatonin out of the breeding season

Testicular function and semen characteristics of Awassi rams treated with melatonin out of the breeding season

Preservation effects of melatonin on the quality and fertility of native Fars rooster semen during liquid storage

Environmental and social cues can be used in combination to develop sustainable breeding techniques for goat reproduction in the subtropics

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