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Effects of radiocobalt irradiation of rabbit spermatozoa in vitro on fertilization and early development


Effects of radiocobalt irradiation of rabbit spermatozoa in vitro on fertilization and early development



Anatomical Record 129(2): 211-229



ISSN/ISBN: 0003-276X

PMID: 13509192

DOI: 10.1002/ar.1091290206

Rabbit semen was irradiated at 90 to 65,000 r from a radiocobalt source and artificially inseminated in females. Ova were examined at pronuclear, segmentation, and blastocyst stages and fetuses were examined before delivery. The motility of spermatozoa was damaged only at a very high dose of irradiation, 32,200 to 65,000 r. Though incapacity of sperm to reach the site of fertilization may occur, fertilizing capacity per se appears to be undamaged. Cleavage of fertilized ova was very much disturbed. The disturbance is in proportion to the dose level and the higher the dose level the earlier the failure of segmentation. With irradiation of sperm at 90 r, the proportion of morphologically normal fetuses is not significantly lower than in normal breeding; with irradiation at 800 r, the formation of normal blastocysts is disturbed; but once the blastocyst is formed, implantation and normal development is assured; with irradiation of sperm at 6,500 r, no normal blastocyst is formed. The delayed penetration of sperm, the high proportion of polyspermic ova, the haploidy and triploidy of ova, and the delayed syngamy following the irradiation of sperm at 32,200 to 65,000 r were not observed. Fragmentation of female and male pronuclei, irregularity of nuclear formation at segmentation stages and one possible gynogenetic ovum out of 32 ova were observed.

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Related references

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