The Endometrium of Delayed and Early Implantation

  • Allen C. Enders
  • Randall L. Given


The length of gestation in a given species is generally proportional to the size of the young at birth and the relative maturity of the neonates. However, there are several variations in reproductive patterns that can extend the length of time from copulation to parturition. Delayed fertilization is a rare phenomenon found in a few species of bats (Wimsattet al 1966). Characteristically, sperm from a fall mating remain viable at the tubouterine junction until ovulation in the spring (Racey and Potts, 1970), and there is no retardation in the development of the zygote once fertilization has occurred. Conversely, in retarded development, now reported in at least two genera of bats, implantation occurs shortly after the blastocyst appears in the uterus, but formation of the placenta is slow, expecially the establishment of appropriate vascularization, and the early developmental stages of the embryo are retarded (Fleming, 1971; Bleier, 1975; Burns and Wallace, 1975; Wimsatt, 1975).


Gland Cell Delay Period Glandular Epithelium Common Shrew Luminal Epithelium 


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  1. Aitken, R. J., 1974, Delayed implantation in roe deer (Capreolus capreolus), J. Reprod. Fertil. 39:225– 233.Google Scholar
  2. Aitken, R. J., 1974, Calcium and zinc in the endometrium and uterine flushing of the roe deer (Capreolus capreolus) during delayed implantation, Reprod. Fertil 40: 333–340.Google Scholar
  3. Aitken, R. J., 1975, Ultrastructure of the blastocyst and endometrium of the roe deer (Capreolus capreolus) during delayed implantation, J. Anat. 119: 369–384.PubMedGoogle Scholar
  4. Aitken, R. J., Burton, J., Hawkins, J., Kerr-Wilson, R., Short, R. V., and Stevens, D. H., 1973, Histological and ultrastructural changes in the blastocyst and reproductive tract of the roe deer (Capreolus capreolus), during delayed implantation, Reprod. Fertil 34: 481–493.Google Scholar
  5. Alden, R. H., 1947, Implantation of the rat egg. II. Alterations in epithelial lipids of the rat uterus under normal and experimental conditions, Anat. Rec 97: 1–19.PubMedGoogle Scholar
  6. Backhouse, K. M., and Hewer, H. E., 1964, Features of reproduction in the grey seal, Med. Biol. Illus 14: 144–150.PubMedGoogle Scholar
  7. Barabash-Nikiforov, I. I., 1935, The sea otter of the Commander Islands, Mammal. 16: 225–261.Google Scholar
  8. Beier, H. M., 1974, Oviducal and uterine fluids, Reprod. Fertil 37: 221–237.Google Scholar
  9. Bergstrom, S., 1972, Delay of blastocyst implantation in the mouse by ovariectomy or lactation: A scanning electron microscope study, Fertil. Steril 23: 548–561.PubMedGoogle Scholar
  10. Bergstrom, S., and Nilsson, O., 1972, Ultrastructural response of blastocysts and uterine epithelium to progresterone deprivation during delayed implantation in mice, Endocrinol. 55:217– 218.Google Scholar
  11. Bischoff, T. L. W., 1854Entwicklungsgeschichte des Rehes Giessen.Google Scholar
  12. Bleier, W. J., 1975, Early embryology and implantation in the California leaf-nosed bat, Macrotus californicus, Anat. Rec 182: 237–254.Google Scholar
  13. Boshier, D. P., and Holloway, H., 1973, Effects of ovarian steroid hormones on histochemically demonstrable lipids in the rat uterine epithelium, Endocrinol. 56: 59–67.Google Scholar
  14. Brambell, F. W. R., 1935, Reproduction in the common shrew (Sorex araneus L.). I. The oestrous cycle of the female, Philos. Trans. R. Soc. Ser. B 225: 1–50.Google Scholar
  15. Brambell, F. W. R., 1937, The influence of lactation of the mammalian embryo, Am. J. Obstet. Gynecol 33: 942–954.Google Scholar
  16. Brambell, F. W. R., and Hall, K., 1936, Reproduction in the lesser shrew (Sorex minutus Linnaeus), Proc. Zool. Soc. London, p. 957.Google Scholar
  17. Brambell, F. W. R., and Rowlands, I. W., 1936, Reproduction of the bank vole (Evotomys glareolus, Schreber). I. The oestrous cycle of the female, Philos. Trans. R. Soc. Ser. B 226: 71–97.Google Scholar
  18. Brokelmann, J., and Fawcett, D. W., 1969, The localization of endogenous peroxidase in the rat uterus and its induction by estradiol, Biol. Reprod 1: 59–71.PubMedGoogle Scholar
  19. Buchanan, G. D., 1967, The presence of two conceptuses in the uterus of a nine-banded armadillo, /. Reprod. Fertil. 13: 329–331.Google Scholar
  20. Buchanan, G. D., Enders, A. C., and Talmage, R. V., 1956, Implantation in armadillos ovariectom- ized during the period of delayed implantation, Endocrinol. 14: 121–129.Google Scholar
  21. Burns, J. M., and Wallace, W. E., 1975, Hormonal control of delayed development in Macrotus waterhousii. II. Radioimmunoassay of plasma estrone and estradiol 17–73 during pregnancy, Gen. Comp. Endocrinol 25: 529–533.PubMedGoogle Scholar
  22. Calarco, P. G., and Epstein, C. J., 1973, Cell surface changes during preimplantation development in the mouse, Dev. Biol 32: 208–213.PubMedGoogle Scholar
  23. Canivenc, R., and Laffargue, M., 1963, Inventory of problems raised by the delayed ova implantation in the european badger (Meles meles L.), in: Delayed Implantation ( A. C. Enders, ed.), pp. 115–125 University of Chicago Press, Chicago.Google Scholar
  24. Chatterton, R. T., Jr., Macdonald, G. J., and Ward, D. A., 1975, Effect of blastocysts on rat ovarian steroidogenesis in early pregnancy, Biol. Reprod 13: 77–82.PubMedGoogle Scholar
  25. Christie, G. A., 1967, Implantation of the rat embryo: Further histochemical observations on carbohydrate, RNA and lipid metabolic pathways, Reprod. Fertil 13: 281–296.Google Scholar
  26. Churg, A., and Anderson, W. A., 1974, Induction of endometrial peroxidase synthesis and secretion by estrogen and estrogen antagonist, Cell Biol. 62: 449–459.Google Scholar
  27. Clemetson, C. A. B., Kim, J. K., Mallikarjuneswara, V. R., and Wilds, J. H., 1972, The sodium and potassium concentrations in the uterine fluid of the rat at the time of implantation, Endocrinal. 54: 417–423.Google Scholar
  28. Craig, A. M., 1964, Histology of reproduction and the estrus cycle in the female fur seal, Callorhinus ursinus, Fish. Res. Board Can 21: 773–811.Google Scholar
  29. Craighead, J. J., Hornocker, M. G., and Craighead, F. C., 1969, Reproductive biology of young female grizzly bears, Reprod. Fertil. Suppl 6: 447–475.Google Scholar
  30. Daniel, J. C., 1971, Growth of the preimplantation embryo of the northern fur seal and its correlation with changes in uterine protein, Dev. Biol 26: 316–322.PubMedGoogle Scholar
  31. Daniel, J. C., and Krishnan, R. S., 1969, Studies on the relationship between uterine fluid components and the diapausing state of blastocysts from mammals having delayed implantation, Exp. Zool 172: 267–282.Google Scholar
  32. Dawson, A. B., and Kosters, B. A., 1944, Preimplantation changes in the uterine mucosa of the cat, Am. J. Anat. 74:1–35.Google Scholar
  33. Deanesly, R., 1935, The reproductive processes of certain mammals. IX. Growth and reproduction in the stoat (Mustela erminea), Philos. Trans. R. Soc. Ser. B 225: 459–492.Google Scholar
  34. Deanesly, R., 1943, Delayed implantation in the stoat (Mustela mustela), Nature. (London) 151:365– 366.Google Scholar
  35. Elftman, H., 1958, Estrogen control of the phospholipids of the uterus, Endocrinology 62: 410–415.PubMedGoogle Scholar
  36. Elftman, H., 1963, Estrogen induced changes in the golgi apparatus and lipid of the uterine epithelium of the rat in the normal cycle, Anat. Rec 146: 139–143.Google Scholar
  37. Enders, A. C., 1961, Comparative studies on the endometrium of delayed implantation, Anat. Rec 139: 483–497.Google Scholar
  38. Enders, A. C., 1966, The reproductive cycle of the nine-banded armadillo (Dasypus novemcinctus), in: Comparative Biology of Reproduction in Mammals ( I. W. Rolands, ed.), pp. 295–310, Academic Press, New York.Google Scholar
  39. Enders, A. C., 1967, The uterus in delayed implantation, in Cellular Biology of the Uterus ( R. M. Wynn, ed.), pp. 151–186, Appleton-Century-Crofts, New York.Google Scholar
  40. Enders, A. C., and Buchanan, G. D., 1989, The reproductive tract of the female nine-banded armadillo, Tex. Rep. Biol. Med 17: 323–340.Google Scholar
  41. Enders, A. C., and Buchanan, G. D., 1959, Some effects of ovariectomy and injection of ovarian hormones in the armadillo, Endocrinol. 19: 251–258.Google Scholar
  42. Enders, A. C., and Nelson, D. M., 1973, Pinocytotic activity of the uterus of the rat, Am. Anat 138: 277–300.Google Scholar
  43. Enders, A. C., and Schlafke, S., 1965, The fine structure of the blastocyst: Some comparative studies, in: Preimplantation Stages of Pregnancy, pp. 29–59, Ciba Foundation Symposium.Google Scholar
  44. Enders, A. C., and Schlafke, S., 1974, Surface coats of the mouse blastocyst and uterus during the preimplantation period, Anat. Rec 180: 31–46.PubMedGoogle Scholar
  45. Enders, A. C., Buchanan, G. D., and Talmage, R. V., 1958, Histological and histochemicalGoogle Scholar
  46. observations on the armadillo uterus during the delayed and post-implantation periods, Anat Google Scholar
  47. Rec 130:639–657.Google Scholar
  48. Enders, A. C., Enders, R. K., and Schlafke, S., 1963, An electron microscopic study of the gland cells of the mink endometrium, Cell Biol. 18: 405–418.Google Scholar
  49. Enders, R. K., 1952, Reproduction in the mink (Mustela vison), Proc. Am. Philos. Soc 96: 691–755.Google Scholar
  50. Enders, R. K., 1955, Delayed implantation in mammals, in: Transactions of the Second Conference on Gestation ( Josiah Macy, Jr. Foundation ), pp. 113–130.Google Scholar
  51. Enders, R. K., and Enders, A. C., 1963, Morphology of the female reproductive tract during delayed implantation in the mink, in: Delayed Implantation ( A. C. Enders, ed.), pp. 129–140, University of Chicago Press, Chicago.Google Scholar
  52. Fayenuwo, J. O., and Halstead, L. B., 1974, Breeding cycle of straw-colored fruit bat, Eidolon helvum, at Ile-Ife, Nigeria, Mammal. 55: 453–154.Google Scholar
  53. Finn, C. A., and Hinchliffe, J. R., 1965, Histological and histochemical analysis of the formation of implantation chambers in the mouse uterus, Reprod. Fértil 9: 301–309.Google Scholar
  54. Finn, C. A., and McLaren, A., 1967, A study of the early stages of implantation in mice. Reprod. Fértil 13: 259–267.Google Scholar
  55. Fisher, H. D., 1954, Delayed implantation in the harbour seal, Phoca vitulina L., Nature 173: 879–880.PubMedGoogle Scholar
  56. Fleming, T. H., 1971, Artibeus jamaicensis: Delayed embryonic development in a neotropical bat, Science 171: 402–404.Google Scholar
  57. Foresman, K. R., and Mead, R. A., 1973, Duration of postimplantation in a western subspecies of the spotted skunk f. Mammal. 54: 521–523.Google Scholar
  58. Foresman, K. R., and Mead, R. A., 1974, Patterns of luteinizing hormone secretion during delayed implantation in the spotted skunk (Spilogale putorius latifrons), Biol. Reprod 11: 475–480.PubMedGoogle Scholar
  59. Gulamhusein, A. P., and Thawley, A. R., 1974, Plasma progesterone levels in the stoat. Reprod. Fértil 36: 405–408.Google Scholar
  60. Gwatkin, R. B. L., 1969, Nutrition requirements for post-blastocyst development in the mouse, Int. J. Fértil 14: 101–105.PubMedGoogle Scholar
  61. Hall, K., 1973, Lactic dehydrogenase and other enzymes in the mouse uterus during the peri- implantation period of pregnancy, Reprod. Fértil 34: 79–91.Google Scholar
  62. Hall, K., 1975, Lipids in the mouse uterus during early pregnancy, Endocrinol. 65: 223–243.Google Scholar
  63. Hamilton, W. J., Jr., and Eadie, W. R., 1964, Reproduction in the otter Mammal. 45: 242–251.Google Scholar
  64. Hamlett, G. W. D., 1932a, The reproductive cycle in the armadillo, Wiss. Zool 141: 143–157.Google Scholar
  65. Hamlett, G. W. D., 1932b, Observations on the embryology of the badger, Anat. Rec 53: 283–303.Google Scholar
  66. Hamlett, G. W. D., 1935, Delayed implantation and discontinous development in the mammals, Q. Rev. Biol 10: 432–447.Google Scholar
  67. Hansson, A., 1947, The physiology of reproduction in mink (Mustela vison Schreb) with special reference to delayed implantation, Acta Zool. (Stockholm) 28: 1–136.Google Scholar
  68. Harrison, R. J., 1960, Reproduction and reproductive organs in common seals (Phoca vitulina), Mammalia 24: 372–385.Google Scholar
  69. Harrison, R. J., 1963, A comparison of factors involved in delayed implantation in badgers and seals in Great Britain, in: Delayed Implantation ( A. C. Enders, ed.), pp. 99 - 114, University of Chicago Press, Chicago.Google Scholar
  70. Harrison, R. J., and Hamilton, W. J., 1952, The reproductive tract and placenta and membranes of Père David’s deer (Elaphurus davidianus Milne Edwards), Anat. 86: 203–255.Google Scholar
  71. Harrison, R. J., and Hyett, A. R., 1954, The development and growth of the placentomes in the fallow deer (Dama dama L. ), Anat. 88: 338–355.Google Scholar
  72. Harrison, R. J., and Neal, E. G., 1959, Delayed implantation in the badger (Meles meles), Mem. Soc. Endocrinol. No. 6 (Implantation of Ova), pp. 23–25.Google Scholar
  73. Harrison, R. J., Matthews, L. H., and Roberts, J. M., 1952, Reproduction in some Pinnipedia, Trans. Zool. Soc. London) 27: 437–540.Google Scholar
  74. Hedlund, K, and Nilsson, O., 1971, Hormonal requirements for the uterine attachment reaction and blastocyst implantation in the mouse, hamster and guinea-pig Reprod. Fértil. 26:267– 269.Google Scholar
  75. Hewer, H. R., and Backhouse, K. M., 1968, Embryology and foetal growth of the grey seal, Halichoerus grypus, J. Zool. London 155: 507–533.Google Scholar
  76. Hughes, R. L., Thomson, J. A., and Owen, W. H., 1965, Reproduction in natural populations of the Australian ringtail possum. Pseudochirus peregrinus (Marsupialia: Phalangeridae), in Victoria, Aust.J. Zool. 13: 383–406.Google Scholar
  77. Jenkinson, J. W., 1913, Vertebrate Embryology, Clarendon Press, Oxford.Google Scholar
  78. Joshi, M. S., and Murray, I. M., 1974, Immunological studies of the rat uterine fluid peptidase, Reprod. Fertil 37: 361–365.Google Scholar
  79. Labhsetwar, A. P., and Enders, A. C., 1968, Progesterone in the corpus luteum and placenta of the armadillo, Dasypus novemcinctus, J. Reprod. Fertil 16: 381–387.Google Scholar
  80. Lataste, F., 1891, De la variation de duree la gestation chez les mammifères et des circonstances qui déterminent ces variations, Mem. Soc. Biol 43: 21–31.Google Scholar
  81. Laws, R. M., 1956, The elephant seal, Mirounga leonina. III. Physiology of reproduction, Falkland Isl. Depend. Surv. Sci. Rep., No 15.Google Scholar
  82. Levin, R. J., 1973 The critique on the relevance of membrane potentials to the mechanisms of nidation, J. Endocrinol, 58: 141–142.PubMedGoogle Scholar
  83. Lincoln, G. A., and Guinness, F. E., 1972, Effect of altered photoperiod on delayed implantation and moulting in roe deer, Reprod. Fertil 31: 455–457.Google Scholar
  84. Marston, J. H., and Chang, M. C., 1965, The breeding, mangement and reproductive physiology of the Mongolian gerbil (Meriones unguiculatus), Lab. Anim. Care. 15: 34–48.PubMedGoogle Scholar
  85. McLaren, A., 1968, A study of blastocysts during delay and subsequent implantation in lactating mice, Endocrinol 42: 453–463.Google Scholar
  86. McLaren, A., 1973, Blastocyst activation, in: The Regulation of Mammalian Reproduction (S. J. Segal, R. Crozier, P. A. Corfman, and P. G. Concliffe, eds.), pp. 321–334, Charles C Thomas, Springfield, 111.Google Scholar
  87. Mead, R. A., 1968a, Reproduction in eastern forms of the spotted skunk (genus Spilogale),]. Zool. London 156: 119–136.Google Scholar
  88. Mead, R. A., and Eik-Nes, K. B., 1969, Seasonal variation in plasma levels of progesterone in western forms of the spotted skunk, Reprod. Fertil. Suppl 6: 397–403.Google Scholar
  89. Mintz, B., 1970, Control of embryo implantation and survival, in: Advances in the Biosciences 6, ( G. Raspe, ed.), pp. 317–341, Pergamon Press-Vieweg, Oxford.Google Scholar
  90. Moller, O. M., 1973, The progesterone concentrations in the peripheral plasma of the mink (Mustela vison) during pregnancy, Endocrinol. 56: 121–132.Google Scholar
  91. Murphy, B. D., and James, D. A., 1974, Mucopolysaccharide histochemistry of the mink uterus during gestation, Can. J. Zool 52: 687–693.PubMedGoogle Scholar
  92. Mutere, F. A., 1967, The breeding biology of equatorial vertebrates: Reproduction in the fruit bat, Eidolon helvum, at latitude 020N., Zool. London 153: 153–161.Google Scholar
  93. Nilsson, O., 1974, The morphology of blastocyst implantation, Reprod. Fertil 39: 187–194.Google Scholar
  94. Norris, M. L., and Adams, C. E., 1971, Delayed implantation in the Mongolian gerbil, Meriones unguiculatus, J. Reprod. Fertil. 27: 487 (abst.).Google Scholar
  95. Orsini, M. W., and Meyer, R. K., 1962, Effect of varying doses of progesterone on implantation in the ovariectomized hamster, Proc. Soc. Exp. Biol. Med. V 110: 713–715.Google Scholar
  96. Padykula, H. A., and Taylor, J. M., 1971, Ultrastructural differentiation of the endometrium of the opossum (Didelphis marsupialis virginiana) during pregnancy, Anat. Rec 169: 394–395.Google Scholar
  97. Parr, M. B., and Parr, E. L., 1974, Uterine luminal epithelium: protrusions mediate endocytosis, not apocrine secretion, in the rat, Biol. Reprod 11: 220–223.PubMedGoogle Scholar
  98. Patterson, J. T., 1913, Polyembryonic development in Tatusia novemcincta,]. Morphol. 24: 559–684.Google Scholar
  99. Pearson, A. K., and Enders, R. K., 1951, Further observations on the reproduction of the Alaskan fur seal, Anat. Rec 111: 695–712.PubMedGoogle Scholar
  100. Peyre, A., and Herlant, M., 1967, Ova-implantation différée et déterminisme hormonal chez le Minioptère, Miniopterus schreibersi K. (Chiroptère), C. R. Séances Soc. Biol 161: 1779–1782.Google Scholar
  101. Pinsker, M. C., Sacco, A. G., and Mintz, B., 1974, Implantation-associated proteinase in mouse uterine fluid, Dev. Biol 38: 285–290.PubMedGoogle Scholar
  102. Potts, D. M., 1966, The attachment phase of ovoimplantation, Am.J. Obstet. Gynecol. 96: 1122–1128.PubMedGoogle Scholar
  103. Potts, D. M., 1968, The ultrastructure of implantation in the mouse, Anat. 103: 77–90.Google Scholar
  104. Potts, D. M., and Wilson, I. B., 1967, The preimplantation conceptus of the mouse at 90 hours post coitum, Anat. 102: 1–11.Google Scholar
  105. Psychoyos, A., 1973, Hormonal control of ovoimplantation, Vitam. Horm 31: 201–256.PubMedGoogle Scholar
  106. Psychoyos, A., and Mandon, P., 1971, Scanning electron microscopy of the surface of the rat uterine epithelium during delayed implantation, Reprod. Fertil 26: 137–138.Google Scholar
  107. Racey, P. A., and Potts, D. M., 1970, Relationship between stored spermatozoa and the uterine epithelium in the pipistrelle bat (Pipistrellus pipistrellus) J. Reprod. Fertil. 22: 57–63.PubMedGoogle Scholar
  108. Rand, R. W., 1954, Reproductin in the femle cape fur seal Arctocephalus pusillus, Proc. Zool. Soc. (London) 124: 717–740.Google Scholar
  109. Reinius, S., 1067, Ultrastructure of blastocyst attachment in the mouse, Z. Zellforsch. 77: 257–266.Google Scholar
  110. Renfree, M. B., 1973, Proteins in the uterine secretions of the marsupial Macropus eugenu, Dev. Biol. 32: 41–49.Google Scholar
  111. Renfree, M. B., 1975, Uterine proteins in the marsupial, Didelphis marsupialis virginiana, during gestation, Reprod. Fertil 42: 163–166.Google Scholar
  112. Sacco, A. G., and Mintz, B., 1975, Mouse uterine antigens in the implantation period of pregnancy, Biol. Reprod 12: 498–503.PubMedGoogle Scholar
  113. Schlafke, S. J., and Enders, A. C., 1963, Observations on the fine structure of the rat blastocyst, Anat. 97: 353–360.Google Scholar
  114. Setty, B. S., Singh, M. M., Chowdhury, S. R., and Kar, A. B., 1973, The role of electrolytes of the endometrium and uterine fluid during delayed implantation in rats, Endocrinol. 59: 461–464.Google Scholar
  115. Sharman, G. B., 1955, Studies on marsupial reproduction. II. The oestrous cycle of Setonix brachyurus, Aust.J. Zool. 3: 44–55.Google Scholar
  116. Shelden, R. M., 1972, The fate of short-tailed weasel, Mustela erminea, blastocysts following ovariectomy during diapause, Reprod. Fertil 31: 347–352.Google Scholar
  117. Short, R. V., and Hay, M. F., 1965, Delayed implantation in the roe deer, Capreolus capreolus, J. Reprod. Fertil 9: 372–373.Google Scholar
  118. Short, R. V., and Hay, M. F., 1966, Delayed implantation in the roe deer Capreolus capreolus, in: Comparative Biology of Reproduction in Mammals ( I. W. Rolands, ed.), pp. 173–194, Academic Press, London.Google Scholar
  119. Sinha, A. A., ConaWay, C. H., and Kenyon, K. W., 1966, Reproduction in the female sea otter, Wildl. Manage 30: 121–130.Google Scholar
  120. Smith, A. F., and Wilson, I. B., 1974, Cell interaction at the maternal-embryonic interface during implantation in the mouse, Cell Tiss. Res 152: 525–542.Google Scholar
  121. Smith, M. S. R., and Wison, I. B., 1971, Histochemical observations on early implantation in the mouse, Embryol. Exp. Morphol 25: 165–174.Google Scholar
  122. Stieve, H., 1950, Anatomische-biologische Untersuchungen über die Fortpflanzungstätigkeit des europäischen Rehes (Capreolus capreolus capreolus L.), Z. mikrosk. Anat. Forsch. (Leipz) 55: 427–530.Google Scholar
  123. Surani, M., 1975a, Zona pellucida denudation, blastocyst proliferation and attachment in the rat, Embryol. Exp. Morphol 33: 343–353.Google Scholar
  124. Surani, M., 19756, Hormonal regulation of proteins on the uterine secretion of ovariectomized rats and the implications for implantation and embryonic diapause, Reprod. Fertil 43: 411–417.Google Scholar
  125. Svihla, A., 1932, A comparative life history study of the mice of the genus Peromyscus, Univ. Mich. Mus. Zool. Misc. Publ, No. 24.Google Scholar
  126. Talmage, R. V., Buchanan, G. D., Kraintz, F. W., Lazo-Wasem, E. A., and Zarrow, M. X., 1954, The presence of a functional corpus luteum during delay implantation in the armadillo, Endocrinol. 11: 44–49.Google Scholar
  127. Tarkowski, A. K., 1957, Studies on reproduction and prenatal morality of the common shrew (Sorex araneus L). II. Reproduction under natural conditions, Ann. Univ. Mariae Curie- Sklodowska 10: 177–244.Google Scholar
  128. Tyndale-Biscoe, C. H., 1963, The role of the corpus luteum in the delayed implantation of marsupials, in: Delayed Implantation ( A. C. Enders, ed.), pp. 15 - 32, University of Chicago Press, Chicago.Google Scholar
  129. Tyndale-Biscoe, C. H., 1970, Resumption of development by quiescent blastocysts transfered to primed, ovariectomized recipients in the marsupial, Macropus eugenii, J. Reprod. Fertil 23: 25–32.Google Scholar
  130. Tyndale-Biscoe, C. H., Hearn, J. P., and Renfree, M. B., 1974, Control of reproduction in macropodid marsupials. Endocrinol. 63: 589–614.Google Scholar
  131. Warren, R. H., and Enders, A. C., 1964, An electron microscope study of the rrat endometrium during delayed implantation, Anat. Ree 148: 177–195.Google Scholar
  132. Weitlauf, H. M., 1974, Metabolic changes in the blastocysts of mice and rats during delayed implantation, Reprod. Fertil 39: 213–224.Google Scholar
  133. Wimsatt, W. A., 1963, Delayed implantation in the Ursidae, with particular reference to the black bear (Ursus americanus Pallus), in: Delayed Implantation ( A. C. Enders, ed.), pp. 49–76, University of Chicago Press, Chicago.Google Scholar
  134. Wimsatt, W. A., 1974, Morphogenesis of the fetal membranes and placenta of the black bear, Ursus americanus (Pallus), Am. J. Anat 140: 471–496.PubMedGoogle Scholar
  135. Wimsatt, W. A., 1975, Some comparative aspects of implantation, Biol. Reprod 12: 1–40.PubMedGoogle Scholar
  136. Wimsatt, W. A., Krutzsch, P. H., and Napolitano, L., 1966, Studies on sperm survival mechanism in the female reproductive tract of hibernating bats. I Cytology and ultrastructure of intrauterine spermatozoa in Myotis lucifugus, Am. J. Anat. 119: 25–60.Google Scholar
  137. Wong, Y. C., and Dickson, A. D., 1969, A histochemical study of ovoimplantation in the mouse, Anat. 105: 547–555.Google Scholar
  138. Wright, P. L., 1963, Variations in reproduction cycles in North American mustelids, in: Delayed Implantation ( A. C. Enders, ed.), pp. 77–95, University of Chicago, Press, Chicago.Google Scholar
  139. Wright, P. L. 1966, Observation on the reproductive cycle of the American badger (Taxidea taxus), in: Comparative Biology of Reproduction in Mammals ( I. W. Rowlands, ed.), pp. 27–45, Academic Press, New York.Google Scholar
  140. Wright, P. L., and Coulter, M. W., 1967, Reproduction and growth in Maine fishers, Wildl. Manage 31: 70–87.Google Scholar
  141. Yochim, J. M., 1975, Development of the progestational uterus: Metabolic aspect, Biol. Reprod 12: 106–133.PubMedGoogle Scholar
  142. Ziegler, L., 1843, Beobachtungen über die Brunst und den Embryo der Rehe Hannover.Google Scholar

Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • Allen C. Enders
    • 1
  • Randall L. Given
    • 1
  1. 1.Department of Anatomy and NeurobiologyWashington University School of MedicineSt. LouisUSA

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