Effects of melatonin and photoperiod regimen on reproductive characteristics and hormonal status of Afshari rams out of breeding season

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Rajaei Moghadam A.; MASOUMI R.; SHAHMORADI M.

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Journal: JOURNAL OF RUMINANT RESEARCH Year:2019 | Volume:7 | Issue:1 Page(s): 47-58

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Title

Effects of melatonin and photoperiod regimen on reproductive characteristics and hormonal status of Afshari rams out of breeding season

Author(s)

Rajaei Moghadam A. | MASOUMI R. | SHAHMORADI M. | Issue Writer Certificate

Keywords

Afshari ramQ1

MelatoninQ2

Photoperiod regimenQ1

TestosteroneQ2

Sperm parametersQ2

Abstract

Background and objectives: It is well known that rams show a marked seasonal variation in many reproductive aspects, including testicular size, semen production, plasma Testosterone concentration and sexual behavior – characteristics that generally increase from spring to autumn. These changes are mainly regulated by photoperiod with long days being inhibitory and short days being stimulatory. The administration of Melatonin at the appropriate time of the year, or following a treatment of long days can mimic the stimulatory effect of natural short days in advancing the period of maximum reproductive activity in the ram. The objective of this study was, therefore, to determine whether treating rams with Melatonin and photoperiod in mid-spring increased testicular and semen concentration parameters. The aim of present study was to investigate the effects of Melatonin and changes in Photoperiod regimen on semen characteristics of Afshari rams out of the breeding season. Material and methods: Twelve rams were randomly allocated into three groups: rams in control group were exposed to natural day photoperiod. In Melatonin group rams were treated as the same as control group plus two Melatonin implants (18 mg) one in the area under the skin of the left ear and another in the area below the right ear. In Photoperiod regimen group rams were managed as the same as group 1 and 2 until 4 p. m. (8 hours light) and thereafter were kept in dark stall until 8 am. Plasma Melatonin and Testosterone concentrations were measured by commercial kits. Testicle dimensions were measured five times during experiment and semen samples were taken two days a week for eight weeks. The data were analyzed in a randomized complete block design. Results: The results showed that Photoperiod regimen increased semen wave motion motility in compare to control group (P= 0. 01). In addition, sperm concentration in Melatonin treatment group (5. 32×109 ± 0. 25/mL) significantly increased in compare to control group (4. 12×109 ± 0. 25/mL) and Photoperiod regimen group(4. 15×109 ± 0. 25/mL; P= 0. 002). Plasma membrane integrity in Melatonin treatment group (42. 90 ± 4. 79%) and in photoperiod group (56. 37 ± 4. 79%) on different sampling days were significantly different (P= 0. 05). Sperm viability in Melatonin treatment group (61. 99± 3. 18%) decreased in compare to control group (77. 40 ± 2. 75%) on different sampling days (P= 0. 01). Plasma Melatonin concentration in Melatonin group increased in compare to photoperiod group and also control group. Plasma Testosterone concentration was not affected significantly in experimental groups on different sampling days following Melatonin or photoperiod treatments (P=0. 05). Left scrotal circumferences in Photoperiod regimen group (39269 ± 0. 42 cm) and in Melatonin treatment group (35665. 3 ± 0. 42 cm) were not different on sampling days. Right scrotal circumference in Melatonin treatment group decreased in compare to control group and photoperiod group on different sampling days (P= 0. 08), also, left testis length and right testis length in Melatonin treatment group, control group and photoperiod group were not different on sampling days.

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APA: Copy

Rajaei Moghadam, A., MASOUMI, R., & SHAHMORADI, M.. (2019). Effects of melatonin and photoperiod regimen on reproductive characteristics and hormonal status of Afshari rams out of breeding season. JOURNAL OF RUMINANT RESEARCH, 7(1 ), 47-58. SID. https://sid.ir/paper/244067/en

Vancouver: Copy

Rajaei Moghadam A., MASOUMI R., SHAHMORADI M.. Effects of melatonin and photoperiod regimen on reproductive characteristics and hormonal status of Afshari rams out of breeding season. JOURNAL OF RUMINANT RESEARCH[Internet]. 2019;7(1 ):47-58. Available from: https://sid.ir/paper/244067/en

IEEE: Copy

A. Rajaei Moghadam, R. MASOUMI, and M. SHAHMORADI, “Effects of melatonin and photoperiod regimen on reproductive characteristics and hormonal status of Afshari rams out of breeding season,” JOURNAL OF RUMINANT RESEARCH, vol. 7, no. 1 , pp. 47–58, 2019, [Online]. Available: https://sid.ir/paper/244067/en

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