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- W2045366965 abstract "The potential impact of an agent altering male reproductive function is greater for humans than for animals. Consequently, it is essential that sensitive criteria be used to look for effects on a multiplicity of target sites when an agent is evaluated using an animal model. No animal model has reproductive characteristics similar to those of humans, but this does not negate the validity of using animal models. Classic methodologies for reproductive toxicology are limited by the approaches used for subjective evaluation of testicular histology and use of natural mating for fertility tests. After dosing for an interval at least equal to six times the duration of one cycle of the seminiferous epithelium, sperm from ejaculated semen or the cauda epididymidis can be evaluated for normalcy of morphology or function and should be used for artificial insemination of females to critically evaluate fertility. Normal males of animal models ejaculate a great excess of sperm. A 50 or 90% reduction in the number of fertile sperm deposited during mating probably will not markedly reduce fertility. Artificial insemination of a critical number of sperm, selected to result in slightly less than maximal fertility for control animals, will maximize the probability of detecting a decrease in fertility if the same critical number of sperm is inseminated for treated animals as for control animals. Testicular function should be evaluated by objective, rather than subjective, criteria. For each male, a piece of testicular tissue should be appropriately fixed and an aliquot of parenchyma should be homogenized to allow enumeration of homogenization-resistant spermatids. Among the more sensitive criteria of testicular function are the minor diameter of essentially round seminiferous tubules, the ratio of leptotene spermatocytes to Sertoli cells, the corrected numbers of germ cells per seminiferous tubule cross section, and the number of homogenization-resistant spermatids per testis." @default.
- W2045366965 created "2016-06-24" @default.
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- W2045366965 date "1986-12-01" @default.
- W2045366965 modified "2023-09-26" @default.
- W2045366965 title "Detection of alterations in testicular and epididymal function in laboratory animals." @default.
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- W2045366965 doi "https://doi.org/10.1289/ehp.8670149" @default.
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