By E. C. Amoroso (auth.), Stanley R. Glasser, David W. Bullock (eds.)
Long used to be I hugg'd close-long and lengthy. massive were the arrangements for me, trustworthy and pleasant the hands that experience help'd me. Cycles ferried my cradle, rowing and rowing like pleasant boatmen. For room to me stars saved apart of their personal earrings, They despatched impacts to seem after what used to be to carry me. sooner than i used to be born out of my mom, generations guided me, My embryo hasn't ever been lethargic, not anything may perhaps overlay it. -Walt Whitman, "Song of Myself" The womb is the seat of all mammalian existence. In being pregnant, the uterus acquires this impor tance with the coming of the fertilized egg, which takes up place of dwelling for sessions starting from approximately 2 weeks within the opossum to approximately 2 years within the elephant. the coming of the embryo signs a very important time for the institution of being pregnant. For a number of days the blas tocyst continues to be loose within the uterine lumen, the place it depends upon uterine secretions for its sur vival and differentiation. in this time, crucial alterations within the endometrium happen in instruction for attachment of the blastocyst and implantation. Early embryonic loss is an monetary challenge of world proportions in animal husbandry, the place, in pigs and livestock for instance, a few 30% of all fertilizations fail to bring about a being pregnant. In people this determine might be even greater, and estimates of early spontaneous abortions diversity from forty to 60% of all conceptions.
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Additional info for Cellular and Molecular Aspects of Implantation
The purpose of artificial insemination is the utilization of the germ cells of genetically superior males. Likewise, the development of the technique of egg transfer was to allow the full utilization of the germ cells of genetically superior females. When I started my work in the United States, the first thing that came into my mind was to determine whether fertilized rabbit eggs can be stored in a refrigerator without loss of their development potential as is the case for mammalian sperm. As my technique of recovery, manipulation, and transfer of eggs improved, I was able to store the fertilized rabbit eggs in a refrigerator for several days and then transfer them to recipient rabbits.
1974, Ovariectomy during gestation in the American opossum, Didelphis marsupialia virginiana. J. Reprod. Fertil. 39:127-130. Renfree, M. , 1977, Feto-placental influences in marsupial gestation, in: Reproduction and Evolution (1. H. Calaby and C. H. ), pp. 325-332, Australian Academy of Science, Canberra. Richards, J. , Rao, M. , and Ireland, J. , 1978, Actions of pituitary gonadotrophins on the ovary, in: Control of Ovulation (D. B. Crighton, G. R. Foxcroft, N. B. Haynes, and G. E. ), pp. 197-216, Butterworths, London.
Anderson, D. , and Manton, S. , 1972, Studies on the Onychophora. VIII. The relationship between the embryos and the oviduct in the viviparous placental onychophorans Epiperipatus trinidadensis (Bouvier) and Macroperipatus torquatus (Kennel) from Trinidad, Philos. Trans. R. Soc. London B Ser. 264: 161-189. , Carlson, J. , and McCracken, J. , 1974, The effect of endogenous and exogenous estradiol-17f3 on the release of prostaglandin F2a from the ovine uterus, Endocrinology 95:1340-1349. 21 22 Chapter 1 Barrington, E.