Lutton, B.V. & Callard, I.P. (2008)
Morphological relationships and leukocyte influence on steroid production in the epigonal organ-ovary complex of the skate, Leucoraja erinacea. Journal of Morphology, 269(5), 620–629
DOI: 10.1002/jmor.10614
Lutton, B.V. & Callard, I.P. (2008)
Influence of reproductive activity, sex steroids, and seasonality on epigonal organ cellular proliferation in the skate (Leucoraja erinacea). General and Comparative Endocrinology, 155(1), 116–125
DOI: 10.1016/j.ygcen.2007.03.011
Lutton, B.V. & Callard, I.P. (2007)
Effects of reproductive activity and sex hormones on apoptosis in the epigonal organ of the skate (Leucoraja erinacea). General and Comparative Endocrinology, 154(1–3), 75–84
DOI: 10.1016/j.ygcen.2007.06.014
Lutton, B.V. & St George, J. & Murrin, C.R. & Fileti, L.A. & Callard, I.P. (2005)
The elasmobranch ovary. In W.C. Hamlett (Ed.), Reproductive biology and phylogeny of chondrichthyes: sharks, rays and chimaeras, Vol. 3 (pp. 237–281). Science Publishers, Endfield, USA
Lutton, B.V. & Callard, I.P. (2005)
The elasmobranch epigonal-ovarian complex (EOC): Regulation of leukocyte turnover by sex hormones [Abstract]. American Elasmobranch Society 21th Annual Meeting, Tampa, Florida
Koob, T.J. & Callard, I.P. (1999)
Reproductive endocrinology of female elasmobranchs: lessons from the little skate (Raja erinacea) and spiny dogfish (Squalus acanthias). Journal of Experimental Zoology, 284(5), 557–574
DOI: 10.1002/(SICI)1097-010X(19991001)284:5<557::AID-JEZ12>3.0.CO;2-P
Steinetz, B.G. & Schwabe, C. & Callard, I.P. & Goldsmith, L.T. (1998)
Dogfish shark (Squalus acanthias) testes contain a relaxin. Journal of Andrology, 19(1), 110–115
Koob, T.J. & Callard, I.P. (1997)
Reproductive endocrinology of the little skate Raja erinacea and spiny dogfish Squalus acanthias [Abstract]. American Elasmobranch Society 13th Annual Meeting, 26 June–2 July 1997, Seattle, Washington
Sorbera, L.A. & Callard, I.P. (1995)
Myometrium of the spiny dogfish Squalus acanthias: peptide and steroid regulation. American Journal of Physiology. Regulatory, Integrative and Comparative Physiology, 269(2), R389–R397
Callard, I.P. & Fileti, L.A. & Koob, T.J. (1993)
Ovarian steroid synthesis and the hormonal control of the elasmobranch reproductive tract. Environmental Biology of Fishes, 38(1–3), 175–185
DOI: 10.1007/BF00842914
Callard, I.P. & Koob, T.J. (1993)
Endocrine Regulation of the Elasmobranch Reproductive Tract. Journal of Experimental Zoology, 266, 368–377
Perez, L.E. & Callard, I.P. (1993)
Regulation of Hepatic Vitellogenin Synthesis in the Little Skate (Raja erinacea): Use of a Homologous Enzyme-Linked Immunosorbent Assay. Journal of Experimental Zoology, 266, 31–39
Tsang, P.C.W. & Callard, I.P. (1992)
Regulation of Ovarian Steroidogenesis In Vitro in the Viviparous Shark, Squalus acanthias. Journal of Experimental Zoology, 261, 97–104
Perez, L.E. & Callard, I.P. (1992)
Identification of vitellogenin in the little skate (Raja erinacea). Comparative Biochemistry and Physiology – Part B, Comparative Biochemistry, 103(3), 699–705
DOI: 10.1016/0305-0491(92)90393-6
Reese, J.C. & Callard, I.P. (1991)
Characterization of a specific estrogen receptor in the oviduct of the little skate, Raja erinacea. General and Comparative Endocrinology, 84(1), 170–181
DOI: 10.1016/0016-6480(91)90077-J
Tsang, P.C.W. & Callard, I.P. (1988)
In vivo steroidogenic effects of homologous pituitary ventral lobe extract in the spiny dogfish, Squalus acanthias. General and Comparative Endocrinology, 70(1), 164–168
DOI: 10.1016/0016-6480(88)90106-2
Callard, I.P. & Klosterman, L. & Callard, G.V. (1988)
Reproductive Physiology. In Physiology of Elasmobranch Fishes(ed. Trevor J. Shuttleworth): 277–317
DOI: 10.1007/978-3-642-73336-9_10
Tsang, P.C.W. & Callard, I.P. (1987)
Morphological and endocrine correlates of the reproductive cycle of the aplacental viviparous dogfish, Squalus acanthias. General and Comparative Endocrinology, 66(2), 182–189
DOI: 10.1016/0016-6480(87)90266-8
Tsang, P. & Callard, I.P. (1987)
Luteal Progesterone Production and Regulation in the Viviparous Dogfish, Squalus acanthias. Journal of Experimental Zoology, 241, 377–382
DOI: 10.1002/jez.1402410313
Büllesbach, E.E. & Schwabe, C. & Callard, I.P. (1987)
Relaxin from an oviparous species, the skate (Raja erinacea). Biochemical and Biophysical Research Communications, 143(1), 273–280
DOI: 10.1016/0006-291X(87)90661-9
Koob, T.J. & Tsang, P. & Callard, I.P. (1986)
Plasma estradiol, testosterone and progesterone levels during the ovulatory cycle of the little skate, Raja erinacea. Biology of Reproduction, 35(2), 267–275
DOI: 10.1095/​biolreprod35.2.267
Büllesbach, E.E. & Gowan, L.K. & Schwabe, C. & Steinetz, B.G. & O'Byrne, E. & Callard, I.P. (1986)
Isolation, purification, and the sequence of relaxin from spiny dogfish (Squalus acanthias). European Journal of Biochemistry / FEBS, 161(2), 335–341
DOI: 10.1111/j.1432-1033.1986.tb10452.x
Koob, T.J. & Laffan, J.J. & Callard, I.P. (1984)
Effects of relaxin and insulin on reproductive tract size and early fetal loss in Squalus acanthias. Biology of Reproduction, 31(2), 231–238
DOI: 10.1095/​biolreprod31.2.231
Tsang, P.C.W. & Callard, I.P. (1982)
Steroid production by isolated skate ovarian follicular cells. Bulletin of the Mount Desert Island Biological Laboratory, 22, 96–97
Lance, V. & Callard, I.P. (1978)
Gonadotrophic activity in pituitary extracts from a elasmobranch (Squalus acanthias L.). Journal of Endocrinology, 78(1), 149–150
DOI: 10.1677/joe.0.0780149
Lance, V. & Callard, I.P. (1969)
A histochemical study of ovarian function in the ovoviviparous elasmobranch, Squalus acanthias. General and Comparative Endocrinology, 13(2), 255–267
DOI: 10.1016/0016-6480(69)90247-0