کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2072772 1544720 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exogenous melatonin does not improve the freezability of Blanca Andaluza goat semen over exposure to two months of short days
ترجمه فارسی عنوان
ملاتونین خارجی باعث آزاد شدن انسولین اسپرم بلانکا آندالوزا در مواجهه با دو ماه روزه کوتاه
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی


• Bucks were submitted to short (SD), long days (LD) and exogenous melatonin (MEL).
• We investigate the beneficial effect of MEL on quality of frozen semen buck.
• Fresh semen quality was improved by MEL and SD compared to the LD treatment.
• Neither MEL nor SD improved the quality of cooled semen compared to LD treatment.
• The quality of frozen–thawed semen was similar between MEL, SD and LD treatments.

This paper compares the effects of exposure to exogenous melatonin (MEL), short days (SD, 8 h of light) and long days (LD, 16 h of light), on reproductive activity, sperm motility and other reproductive variables, in Blanca Andaluza bucks. Fourteen males were spilt into two groups of seven animals (G1 and G2). They were subjected to five alternations of 2 months of LD followed by 2 months of SD or MEL before the experimental period of three consecutive intervals of: (1) 2 months of SD (G1, N = 7) or MEL (G2, N = 7); (2) 2 months of LD (G1 + G2, N = 14); and (3) 2 months of SD (G2, N = 7) or MEL (G1, N = 7). Plasma testosterone concentration, live weight, testicular weight and fresh semen quality were determined weekly. Semen was also cooled and frozen–thawed every fortnight, and the same quality variables measured as for fresh sperm. When the bucks were under LD treatment, the testosterone concentration was lower than when under MEL or SD treatment (P < 0.01); values for the semen concentration and total number of sperm per ejaculate were also higher (P < 0.001). No differences were observed between the MEL and SD treatments in terms of fresh, cooled or frozen–thawed sperm quality. Only some quality variables on fresh semen were improved by MEL and SD treatment (P < 0.05). In conclusion the results of the present experiment showed that MEL improved the fresh semen motility variables, but this did not improve the motility of frozen–thawed sperm over that recorded for either SD or LD treatment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Reproduction Science - Volume 157, June 2015, Pages 24–32
نویسندگان
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