Perfil sérico de las Hormonas Luteinizante, Folículo Estimulante y 17β-Estradiol en cerdas Landrace x Large White durante el pre-parto, lactancia y posdestete

one of the indexes of productivity of the sow is the number of suckling pigs along the year and depends on the length of gestation, lactation and weaning-pregnancy interval. the objective of this study was to determine the profile of lh, fsh and 17β-estradiol during the pre-farrowing, lactation and post-weaning periods, of 15 pregnant cross-bred sows (landrace x large white), belonging to a farm in yaracuy state. by punction of the jugular vein a blood sample was drawn on d 7 before the farrowing, on d 1, 7, 14 and 21 post-farrowing on d 1 and 3 post-weaning. hormone quantification was performed using an elisa test. the statistical analysis was made by the program spss version 10.0 for windows. a descriptive test followed by multiple comparison, was applied (p<0.05). lh increased during the lactation until a maximum value on d 3 post-weaning (7.40±0.97 mu/ml). fsh levels were lower (p>0.001) during the post-farrowing period in comparison to the pre-farrowing period (6.30±1.10 mu/ml), whereas at weaning the levels increased. the maximum concentration of the e2 was observed on the third day post-weaning (2139.67±125.2 μg/ml) and it was simultaneous with the proper estrous behavior. in the cross-bred sow the hormonal profile is a fine balance of endocrine regulation that allows the farrowing, the lactation and the recovery of the cyclic activity of the ovary, during the early post-weaning period.