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Left testis and epididymis were processed for light and transmission electron microscopy Veeramachaneni et al. Perinatal exposure of rats to vinclozolin impairs reproductive development. Some attributed the problem to maternal exposure to environmental estrogenic or anti-androgenic agents Toppari et al. Body weights were recorded at 6, 12, and 24 weeks of age. Exposure to environmental anti-androgenic agents during critical periods in fetal development can alter the organization or differentiation of the neuroendocrine system, and subsequent sexual function and behavior reviewed by Gray et al. There is a paucity of information on human exposure to metabolites of vinclozolin. Daily sperm production was calculated using a time divisor of 5. In the report Pesticides in the Diets of Infants and Children, prepared by the National Research Council, serious concern was expressed that the young are at special risk with respect to pesticide exposures. It is presumed that their collective concentration was lower than the dosed amount.
Body weights were recorded at 6, 12, and 24 weeks of age. We considered the male as the experimental unit, because for the majority of does we studied only 1 pup of a given age from her litter. Evaluation of mating ability and semen characteristics Beginning at 20 weeks of age, rabbits were trained for semen collection using an artificial vagina and a female rabbit as a teaser. Both M1 and M2 are formed in rats and rabbits Kelce et al. Aberrations in differentiation and development of male reproductive system including cryptorchidism and hypospadias have become a major concern. Daily sperm production was calculated using a time divisor of 5. Karo Light Corn Syrup It is not known if prenatal exposure of rats or non-rodent animal models to relatively low doses of vinclozolin impairs sexual function and spermatogenesis when adult, as is suspected for humans. Tissue sampling and preparation Rabbits were euthanized by CO2 asphyxiation at 12 or 24 weeks of age. We selected a rabbit model primarily because rabbits have a long infantile period before initiation of changes culminating in puberty, mimicking human development, whereas in rodents these changes start at birth Amann , Veeramachaneni et al. Previous Section Next Section Results There was no adverse effect of vinclozolin treatment on maintenance of pregnancy to full term. Status of the anterior pituitary—testicular axis and its capability to respond to hypothalamic stimuli were assessed at 12 and 24 wk by performing gonadotropin-releasing hormone GnRH -challenge tests. It is presumed that their collective concentration was lower than the dosed amount. Tissue or serum concentrations of vinclozolin or its metabolites were not measured and, hence, the amount of vinclozolin-like molecules transferred to fetuses or nursing pups during in utero and lactational exposure is unknown. Both ends of the folded-over inner liner were secured to the Tygon tube with rubber bands. Testing with a male teaser as in third clip in the video; see below in Results section was initiated because in another study, investigating long-term sequelae of developmental exposure to common chemical pollutants in drinking water, we found that some treated males preferred male to female teasers Veeramachaneni et al. For light microscopy, randomly selected, essentially round major diameter less than 1. Upon completion of ejaculation, it is not unusual for the male to pull hair from the nape of the teaser as he dismounts. Male rabbits evince sexual interest by sniffing the hind quarters and external genitalia of the teaser and mounting. As the male intromits and ejaculates, he grasps the nape of the teaser with his teeth. The right testis and epididymis were processed to allow quantification of daily sperm production and epididymal sperm reserves. This window of exposure corresponds with the onset of gonadal differentiation Gondos et al. Failure to manifest such behavior was considered lack of sexual interest. Just prior to use, a collection vial was inserted into one end of an artificial vagina and a small amount of glycerol was smeared on the opening into the artificial vagina end that comes into contact with penis. The space between the Tygon tube and the inner liner was filled with tap water and then the other end of inner liner was folded over the Tygon tube.
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