Los machos cabríos criollos en reposo sexual no adelantan el inicio de la actividad sexual natural ante la exposición constante de hembras inducidas artificialmente al estro
DOI:
https://doi.org/10.59741/agraria.v8i1.450Keywords:
Biostimulation, male effect, female effect, reproductive seasonalityAbstract
The objective of this study was to determine whether the presence of ewes in artificially induced estrus condition, is enough to stimulate or advance the onset of sexual activity in local Creole male goats at natural sexual resting (January-April). Ten Creole goat males at sexual rest and 3 females with induced oestrus were used. All the animals remained lairaged during the experiment. A male witness group remained isolated, without contact with females. The second group, from March and until the end of the study, was put in close contact with the three estrogenizadas females. Each group remained separate from each other, without any visual or olfactory contact between them. Certain variables were, body condition, testicular diameter and the intensity of odor (which is dependent on testosterone), every 2 weeks. Body condition, testicular diameter, and the intensity of odor were subjected to an analysis of variance (ANOVA) with repeated measures and considering two factors (Group and time of the study). The intensity of odor was determined by means of or the Mann-Whitney test. The ANOVA revealed in body condition testicular diameter an effect of the time (P < 0.001), interaction between grupo-tiempo (P < 0.05), however, no statistical difference between groups (P > 0.05) in these two variables. The intensity of odor varied through the study (P < 0.001), Mann-Whitney test indicated a statistical difference between the isolated males, and males with estrogenizadas females only 15 may (P < 0.05). The obtained results allow to conclude that the constant presence of females estrogenizadas during the period of sexual rest, does not encourage or anticipates the onset of sexual activity of the local Creole goats males.
Downloads
References
Álvarez, R.L., W.A. Ducoing, Q.L. Zarco, A.G. Trujillo, 1999. Conducta estral, concentraciones de LH y función lútea en cabras en anestro estacional inducidas a ciclar mediante el contacto con cabras en estro. Vet. Méx. 30(1): 25-31.
Bronson, F.H. 1985. Mammalian Reproduction: An Eco logical Perspective. Biol. Reprod. (32): 1-26. Chemineau, P. 1987. Possibilities for using bucks to stimu late ovarian and oestrous cycles in anovulatory goats. A review. Livest. Prod. Sci. 17: 135-147. DOI: https://doi.org/10.1016/0301-6226(87)90059-5
Delgadillo, J.A., J.A. Flores, F.G. Véliz, G. Duarte, J. Vielma, P. Poindron, B. Malpaux. 2003. Control de la reproducción de los caprinos del subtrópico mexicano utilizando tratamientos fotoperiódicos y el efecto ma cho. Vet. Méx. 34(1): 69-79.
Delgadillo, J.A. 2004. Evidence that the photoperiod con trols the annual changes in testosterone secretion, tes ticular and body weight in subtropical male goats. Reprod. Nutr. Dev. 44(3): 183-93. DOI: https://doi.org/10.1051/rnd:2004024
Flores, J.A., F.G. Véliz, J.A. Pérez-Villanueva, G. Martínez de la Escalera, P. Chemineau, P. Poindron, B. Malpaux, J.A. Delgadillo. 2000. Male reproduc tive condition is the limiting factor of efficiency in the male effect during seasonal anestrus in female goats. Biol. Reprod. 02: 1409-1414. DOI: https://doi.org/10.1095/biolreprod62.5.1409
González, R., P. Orgeur, J.P. Signoret. 1988a. Luteiniz ing hormone, testosterone and cortisol responses in rams upon presentation of estrous females in the nonbreeding season. Theriogenol. 30: 1075-1086. DOI: https://doi.org/10.1016/0093-691X(88)90282-8
González, R., P. Poindron, J.P. Signoret. 1988b. Tempo ral variation in LH and testosterone responses of rams after the introduction of oestrous females during the breeding season J. Reprod. Fertil. 83: 201-208. DOI: https://doi.org/10.1530/jrf.0.0830201
Howland, B.E., L.M. Sanford, W.M. Palmer. 1985. Changes in serum levels of LH, FSH, Prolactin, Tes tosterone, and Cortisol associated with season and mating in male pygmy goats. J. Androl. 6: 89-96. DOI: https://doi.org/10.1002/j.1939-4640.1985.tb00822.x
Illius, A.W., N.B. Haynes, G.E. Lamming. 1976. Effects of ewe proximity on peripheral plasma testosterone levels and behaviour in the ram. J. Reprod. Fertil. 48: 25-32. DOI: https://doi.org/10.1530/jrf.0.0480025
Iwata, E., Y. Wakbayashi, Y. Kakuma, T. Kikusui, Y. Takeuchi, Y. Mori. 2000. Testosterone-dependent primer pheromone production in the sebaceous gland of male goat. Biol. Reprod. (62): 806-810. DOI: https://doi.org/10.1095/biolreprod62.3.806
Lindsey, D.R. 1965. The importance of olfactory stimuli in the mating behavior of the ram. Anim. Behav. 13: 75-78. DOI: https://doi.org/10.1016/0003-3472(65)90074-6
Rekwot, P., D. Ogwu, E. Oyedipe, V. Sekoni. 2001. The role of pheromones and biostimulation in animal repro duction. Anim. Reprod. Sci. 65: 157-170. DOI: https://doi.org/10.1016/S0378-4320(00)00223-2
Sanford, M.L., W.M. Palmer, B.E. Howland. 1974. Influ ence of sexual activity on serum levels of LH and Tes tosterone in the ram. Can. J. Anim. Sci. 54: 579-585. DOI: https://doi.org/10.4141/cjas74-070
Schanbacher, B.D., P. Orgeur, J. Pelletier, J.P. Signoret. 1987. Behavioural and hormonal responses of sexu ally-experienced Ile-de-France rams to oestrous fe males. Anim. Reprod. Sci. 14: 293-300. DOI: https://doi.org/10.1016/0378-4320(87)90019-4
Signoret, J.P. 1991. Sexual pheromones in the domestic sheep: Importance and limits in the regulation of repro ductive physiology. J. Steroid Biochem. Molec. Biol. 39(4): 639-645. DOI: https://doi.org/10.1016/0960-0760(91)90263-5
SYSTAT 10. 2000. Evenston, ILL. USA.
Ungerfeld, R., L. Silva. 2004. Ewe effect: Endocrine and testicular changes in experienced adult and inexperi enced young Corridale rams used for the ram effect. Anim. Reprod. Sci. 80: 251-259. DOI: https://doi.org/10.1016/j.anireprosci.2003.07.002
Walkden-Brown, S.W., B.W. Norton, B.J. Restall. 1994a. Seasonal variation in voluntary feed intake and growth in Australian cashmere bucks fed ad libitum diets of low and high quality. J. Agric. Sci. 45: 355-366. DOI: https://doi.org/10.1071/AR9940355
Walkden-Brown, S.W., B.J. Restall, B.W. Norton, R.J. Scaramuzzi. 1994b. The “female effect” in Australian cashmere goats: effect of season and quality of diet on the LH and testosterone response of bucks to oestrous does. J. Reprod. Fertil. 100(2): 521-31. DOI: https://doi.org/10.1530/jrf.0.1000521
Walkden-Brown, S.W., B.J. Restall, R.J. Scaramuzzi, G.B. Martin, M.A. Blackberry. 1997. Seasonality in male Australian cashmere goats: Long term effects of cas tration and testosterone or oestradiol treatment on changes in LH, FSH and Prolactin concentrations, and body growth. Small Rumin. Res. 26: 239-252. DOI: https://doi.org/10.1016/S0921-4488(97)00017-5
Zarco, L., E.F. Rodríguez, M.R.B. Angulo, J. Valencia. 1995. Female to female stimulation of ovarian activity in the ewe. Anim. Reprod. Sci. 39: 251-258. DOI: https://doi.org/10.1016/0378-4320(95)01384-C
Downloads
Published
Issue
Section
License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
How to Cite
PLUMX Metrics
