RT Journal Article
T1 The High Testosterone Concentrations of the Bucks Used in the “Male Effect” Is Not a Prerequisite for Obtaining High Ovarian Activity in Goats from Mediterranean Latitudes
A1 Zarazaga Garcés, Luis Ángel
A1 Gatica Jorquera, María Carolina
A1 Rosa Lucas, Ignacio de la
A1 Delgado Pertiñez, Manuel
A1 Guzmán Guerrero, José Luis
AB Two experiments were carried out. Firstly, 54 anestrous females were placed in contactwith photostimulated males (Photo; n = 27) or with no photostimulated males (Natural; n = 27).Moreover, a group of bucks treated with artificial photoperiod and a group of bucks subjected tonatural photoperiod without contact with females was used (Photo Isolated and Natural Isolated,respectively). In the Natural groups, the testosterone concentrations were similar except for threedays after the introduction of the bucks to the does (19.72 ± 4.11 vs. 2.05 ± 0.25 ng/mL for Naturaland Natural isolated bucks, respectively, p < 0.05). However, no differences were observed in thePhoto groups during the entire experiment. The percentage of females showing estrous was higher inthe group of females in contact with photostimulated bucks (96 vs. 74%, respectively, p < 0.05). In thesecond experiment, a GnRH agonist, deslorelin, was used to regulate the testosterone concentrationsof the bucks. Seventy anestrous females were divided into five groups depending on the treatmentreceived by the bucks to which they were exposed: photostimulated bucks (Photo group, n = 14);photostimulated bucks but treated with the agonist at the onset of the photoperiod treatment (PhotoAgo Long group, n = 13); photostimulated bucks but treated with the agonist at the end of thephotoperiod treatment (Photo-Ago Short group, n = 15); bucks receiving no photostimulation buttreated with the agonist at the end of the photoperiod treatment period (Natural-Ago Short group,n = 13) and bucks receiving no photostimulation nor agonist (Natural group, n = 15). The agonisttreatment increased testosterone concentrations after the injection, which remained high for theentire experiment (p < 0.05). Six days after the introduction of the bucks to the does, the testosteroneconcentrations increased only in the Natural group reaching similar concentrations to the othergroups (12.17 ± 6.55, 16.69 ± 4.53, 8.70 ± 0.61, 11.03 ± 1.45 and 14.42 ± 3.64 ng/mL for Photo, Photo-Ago Long, Photo-Ago Short, Natural-Ago Short and Natural bucks, respectively, p > 0.05). Nodifferences in reproductive parameters were observed (p > 0.05). These results demonstrate that, atMediterranean latitudes, anestrous females can stimulate the testosterone concentrations of bucksafter a period of isolation. The high testosterone concentrations are not a prerequisite for an adequateresponse to the male effect
PB MDPI
SN 2076-2615 (electrónico)
YR 2022
FD 2022
LK http://hdl.handle.net/10272/20894
UL http://hdl.handle.net/10272/20894
LA eng
NO Zarazaga, L. Á., Gatica, M.-C., De La Rosa, I., Delgado-Pertíñez, M., & Guzmán, J. L. (2022). The High Testosterone Concentrations of the Bucks Used in the “Male Effect” Is Not a Prerequisite for Obtaining High Ovarian Activity in Goats from Mediterranean Latitudes. In Animals (Vol. 12, Issue 8, p. 954). MDPI AG. https://doi.org/10.3390/ani12080954
NO This research was supported by Grant AGL2016-75848-R from MINECO-AEI-FEDER(Spain). The authors wish to thank the farm staff of Huelva University for their technicalsupport. Thanks are also owed to CEI CamBio for their support
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026