RT Journal Article
T1 Exogenous melatonin does not improve the freezability of Blanca Andaluza goat semen over exposure to two months of short days
A1 Gallego Calvo, María Lourdes
A1 Gatica Jorquera, María Carolina
A1 Santiago Moreno, Julian
A1 Guzmán Guerrero, José Luis
A1 Zarazaga Garcés, Luis Ángel
AB 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.
PB Elsevier Masson
SN 0378-4320
SN 1873-2232 (electrónico)
YR 2015
FD 2015
LK http://hdl.handle.net/10272/12148
UL http://hdl.handle.net/10272/12148
LA eng
NO Gallego Calvo, M.L., Gatica Jorquera, M.C.,  Santiago Moreno, J.L., Zarazaga Garcés, L.A.: “Exogenous melatonin does not improve the freezability of Blanca Andaluza goat semen over exposure to two months of short days”. Animal Reproduction Science. Vol.  157, págs. 24-32, (2015). DOI: 10.1016/j.anireprosci.2015.03.010
DS Repositorio Institucional de la Universidad de Huelva
RD 15 jun 2026