REPRODUCCION EN EQUINOS PDF

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Sergio M. Patricia R. Postal Col. En la oveja, Karsch et al. La capacidad de influenciar el ritmo reproductivo circanual depende de varios factores: 1. El desarrollo de la fotorefractariedad puede ser prolongado o ser prevenido cambiando el fotoperiodo en intervalos regulares. Malpaux et al. Esto permite que el sistema reproductivo mantenga una sensibilidad constante a la luz. En carneros, la actividad reproductiva permanente era si los fotoperiodos inhibitorios y.

La presencia o la ausencia de la luz a 9. Las fluctuaciones regulares de temperatura y disponibilidad en alimento se correlacionan estrechamente con los cambios del fotoperiodo en las regiones templadas, pero de manera menos pronunciada en las regiones tropicales. Los organismos que viven en tal medio ambiente se enfrentan al doble reto de aprovechar de un verano de abundancia, y sobrevivir a las dificultades de invierno.

McDaniel et al. Henneke et al. Un efecto estimulante, del forraje pastoreado, en el tiempo de la. Similarmente, yeguas en el inactividad ovulatoria estacional bajo fotoperiodo artificial Asimismo, nosotros. Irvine et al. Esto puede explicar en parte porque Sharp et al. La xylazina, un agonista alfa-adrenergico, aumenta la frecuencia de pulsos de FSH y LH en yeguas en inactividad ovulatoria estacional.

Hyperprolactinemia-induced precocious puberty in the female rat: ovarian site of action. Endocrinology , — Advis, J. Hyperprolactinemia-induced precocious puberty: studies on the mechanisms by which prolactin enhances ovarian progesterone responsiveness to gonadotropins in prepubertal rats. Allen, W. In: Proceedings of the Bain-Fallon Memorial.

Aurich, C. Opioidergic and dopaminergic effects on LH and prolactin release in pony mares at different times of the year. Effects of the opioid antagonist naloxone on release of luteinizing hormone in mares during the anovulatory season. Bennett-Wimbush, K. The effect of perphenazine and bromocryptine on follicular dynamics and endocrine profiles in anestrous pony mares.

Theriogenology 49, — Bertrand, F. Median Eminence dopaminergic activation is critical for the early long-day inhibition of luteinizing hormone secretion in the ewe. Besognet, B. Dopaminergic regulation of gonadotrophin secretion in seasonal anestrous mares J. Induction of reproductive function in anestrous mares using a dopamine antagonist.

Theriogenology 47, — Bevers, M. Chronic treatment with bromocryptine duirng the oestrous cycle of the cow: evidence that prolactin is not involved in preovulatory follicular growthAnim. Bour, B. Stimulation of ovarian activity in the pony mare during winter anoestrus. In: Ellendorff, F. Martinus Nijhoff Publisher, Dordrecht, pp. Boeta, M. Influence of the dopamine antagonist domperidone on the vernal transition in seasonally anoestrous mares. Seasonal and pulsatile dynamics of thyrotropin and leptin in mares maintained under a constant energy balance.

Domest Anim Endocrinol. Callahan, P. Inhibition of tuberoinfundibular dopaminergic neural activity during suckling: involvement of m and k opiate receptor subtypes. Carnevale, E. Age and pasture effects on vernal transition in mares. Serum leptin concentrations in Lipizzan fillies. Reprod Domest Anim. Cox, J. Cooper, W. Winter time breeding of mares using artificial light and insemination: six years' experience. Proc Am Assoc Equine Pract 21, Daels, P. Dopamine antagonist-induced reproductive function in anoestrous mares: gonadotropin secretion and effect of environmental cues.

Davis, S. Intra-follicular and peripheral steroid characteristics during vernal transition in the pony mare. Davison, L. Gonadotropin response to Naloxone in the mare: effect of time of year and reproductive status. Diekman, M. Braun, D. Peter, and D. Seasonal serum concentrations of melatonin in cycling and noncycling mares. J Anim Sci Donadeu, F. Thompson Jr. Administration of sulpiride to anovulatory mares in winter: effects on prolactin and gonadotropin concentrations, ovarian activity, ovulation and hair shedding.

Theriogenology Dutt, R. The effect of low environmental temperature on initiation of the breeding season and fertility in sheep. J Anim Sci 1,— Fitzgerald, B. Comparison of the effects of N-methyl-DL-aspartic acid on gonadotropin and prolactin secretion in anestrous mares and mares exhibiting estrous cycles during anestrus.

Thyroxine concentrations are elevated in mares which continue to exhibit estrous cycles during the nonbreeding season. Equine Vet. Effect of administration of an a2-adrenergic agonist, xylazine, on pulsatile gonadotrophin secretion in anoestrous horse mares. Absence of an association between melatonin and reproductive activity in mares during the nonbreeding season. Monogram 1, — Photoperiodic versus metabolic signals as determinants of seasonal anestrus in the mare.

Biol Reprod Gentry, L. Thompson Jr, G. Gentry Jr, K. Davis, R. Godke, and J. The relationship between body condition, leptin, and reproductive and hormonal characteristics of mares during the seasonal anovulatory period. Ginther, O. Occurrence of anestrous, estrus, diestrus, and ovulation over a twelve-month period in mares.

Folliculogenesis during the transitional period and early ovulatory season in mares. Reproductive biology of the mare: basic and applied aspects. Equiservices, Cross Plains, WI. Godley, W. Wilson, and V. Effect of controlled environment on the reproductive performance of ewes.

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