Effect of Salmonella typhimurium endotoxin on PGF-2 alpha release and fetal death in the mare

The infusion of Salmonella typhimurium endotoxin into pregnant mares resulted in a biphasic release pattern of PGF-2 alpha as determined by 15-keto-13,14-dihydro-PGF-2 alpha concentrations. The initial phase of 1 h duration was followed by accentuated release by 2 h after infusion; concentrations reached basal levels by 6 h. In 7 mares at 23, 26, 29, 33, 36, 53 and 55 days of gestation, fetal death occurred between 36 and 120 h after infusion; 12 mares at 46, 51, 56, 59, 65, 71, 73, 85, 103, 138, 283 and 318 days of gestation did not abort after endotoxin infusion. Luteal activity was compromised in all mares by 9 h after infusion. Progesterone concentrations were consistently lower in mares that aborted (1-2 ng/ml) than in those that did not abort. Mares therefore appear to be vulnerable to fetal loss by a clinical syndrome induced by Salmonella typhimurium endotoxin until about 50-60 days of gestation

Endocrine profiles of ovidectomized native and crossbred goats in semiarid zones of Venezuela

CONTENIDO Editorial González Stagnaro, Carlos Morfología del tracto genital de los pequeños rumiantes Morphology of the genital system of small ruminants Nuñez M., Quiterio Cambios ováricos durante el ciclo estrual en cabras criollas Changes of the ovary during the estrous cycle of native goats González Stagnaro, Carlos y Madrid Bury, Ninoska Ciclo estrual y momento de ovulación en cabras criollas Estrous cycle and ovulation time in native goats González Stagnaro, Carlos y Madrid Bury, Ninoska Neuroendocrinología de la reproducción en el caprino Reproductive reuroendocrinology in goats Chemineau, P. y Delgadillo, J. A. Aspectos característicos de la fisiología de la oveja Some aspects of the reproductive physiology of the ewes López Sebastián, A.; Santiago Moreno, J.; De Bulnes, A.G. y García López, M. Comportamiento reproductivo en ovinos tropicales Reproductive performance in tropical sheep De Cambellas, Josefina B. Comportamiento reproductivo de la cabra en los trópicos Reproductive performance of the goats in the tropics García B., O. y García B., E. Endocrinología de cabras criollas ovidectomizadas y mestizas en zonas semiáridas de Venezuela Endocrine profiles of ovidectomized native and crossbred goats in semiarid zones of Venezuela Leyva Ocariz, H.; Stabenfeldt, G. H.; Munro, C.; Arteaga, M.; Orduz, B.; Díaz, M. y Hernández, I. Mensajes Institucionales157 - 164Nivel analíticobimestra