The physiology of follicular maturation in the pig

• Autorzy: Foxcroft G.R. , Hunter M.G. , Grant S.A.
• Języki publikacji: EN

Abstrakty

EN

Foxcroft, G. R„ Hunter, M. G. and Grant, S. A,: The physiology of follicular maturation in the pig. Acta physiol, pol., 1989, 40 (1): 53-63. Exogenous gonadotrophin (eg. PMSG) treatment results in follicular growth in most reproductive states, and suggests that lack of FSH and LH-like activity is a likely cause of arrested follicular development in the ipig. Endogenous changes in gonadotrophins between reproductive and non-reproductive states are consistent with this concept. However, changes in the pattern of LH secretion, rather than clearly defined changes in FSH release, appear to be the effective trigger for follicular recruitment. In other situations in vivo, follicular growth is initiated in the absehce of demonstrable changes in LH or FSH secretion, suggesting that other hormones interact to sensitize the ovary to gonadotrophins. Such effects have been reported for insulin, cortisol, thyroxine and 1GF-1 in vitro, and the steroid environment of follicles also affects gonadotrophin receptors and receptor-mediated mechanisms. Once initiated, the regulation of follicle maturation also involves interactions between gonadotrophins and steroids, as well as other intra-ovarian regulators. Co-operation exists between theca and granulosa in the synthesis of steroids and androgen precursor availability is an important regulator of the oestrogenic activity of follicles. Considerable heterogeneity exists in the morphological and biochemical maturity of preovulatory follicles and inter-follicular regulation via endocrine and paracrine mechanisms may be an essential component of the selection process.

• Wydawca: -
• Czasopismo: Acta Physiologica Polonica
• Rocznik: 1989
• Tom: 40
• Numer: 1
• Opis fizyczny: p.53-63,fig.,ref.

Twórcy

autor

Foxcroft G.R.

• AFRC Research Group on Hormones and Farm Animal Reproduction, Faculty of Agricultural Science, University of Nottingham, Sutton Bonington, Loubhborough, U.K

autor

Hunter M.G.

• AFRC Research Group on Hormones and Farm Animal Reproduction, Faculty of Agricultural Science, University of Nottingham, Sutton Bonington, Loubhborough, U.K

autor

Grant S.A.

• AFRC Research Group on Hormones and Farm Animal Reproduction, Faculty of Agricultural Science, University of Nottingham, Sutton Bonington, Loubhborough, U.K.

Bibliografia

• 1. Armstrong, J. D., Britt, J. H. (10в5) Nutritionally-induced anestrus in gilts: metabolic and endocrine changes associated with cessation and resumption of estrous cycles, J. Anim. Sci. 68, 508-523.
• 2. Britt, J. H., Armstrong, J. D., Cox, N. M., Eslbenshade, K. L. (1985) Control of follicular development during and after lactation in sows. J. Reprod. Fert. Suppl. 33. 37-54.
• 3. Christenson, R. K., Ford, J. J., Redmer, D. A. (1985) Maturation of ovarian follicles in the prepubertal gilt. J. Reprod. Fert. Suppl. 33. 21-36.
• 4. Clark, J. R., Edey, T. N., First, FI, L., Chapman, A. B., Casida, L. E. (1973) The effects of four genetic groups and two levels of feeding on ovulation rate and follicular development in pubertal gilts. J. Anim. Sci. 36. 1164-1169.
• 5. Dalin, A.-M. (1987) Puberty and oestrus in gilts. Ph. D. Thesis, Uppsala, Sweden.
• 6. Driancourt, M. A. (1967) Follicular dynamics and ovarian control of follicular development in the ewe. Proceedings ol CEC Seminar on "Follicular growth and ovulation rate in iarm animals". Eds. J. F. Roche and D. O. Callaghan, Martinus Nijhoff Publishers, Dordrecht, pp. 87-105.
• 7. Dusza, L. (1987) Prolaktyna, jej wydzielanie i rola w rozrodzie świni. Roczniki Nauk Rolniczych. Seria D, t. 211.
• 8. Ellendorff, F., Parvizi, N. (1967) Neuroendocrine control of follicular development and function in the sow. Proceedings ol CEC Seminar on "Follicular growth and ovulation rate in farm animals". Eds: J. F. Roche and D. O. Callaghan. Martinus Nijhoff Publishers, Dordrecht, pp. 179-189.
• 9. Erickson, G. F., Magoffin, D. A., Dyer, C. A., Hofeditz, C. (1985) The ovarian androgen producing cells: A review of structure/function relationships. Endocrin. Reviews 6. 371-399.
• 10. Foxcroft, G. R. (1987) Follicular dynamics and its control in the sow. Proceedings of CEC Seminar on "Follicular growth and ovulation rate in iarm animals". Eds: J. F. Roche and D. O'Callaghan. Martinus Nijhoff Publishers. Dordrecht, pp. 191-205.
• 11. Foxcroft, G. R., Hunter, M. G. (1985) Basic physiology of follicular maturation in the pig. J. Reprod. Fert. Suppl. 33. 1-19.
• 12. Foxcroft, G. R., Shaw, H. J., Hunter, M. G., Booth, P. J., Lancaster R. T. (1987) Relationships between luteinizing hormone, follicle-stimulating hormone and prolactin secretion and Ovarian follicular development in the weaned sow. Biol. Reprod. 36. 175-191.
• 13. Fry, R. C., Clarke, I. J., Cahill, L. P. (1987) Changes in gonadotrophin concentrations are not necessarily involved in ovarian compensation after unilateral ovariectomy in sheep. A Reprod. Fert. 79. 45-48.
• 14. Grant, S. A. (1989) Control of follicular development in the cyclic gilt and lactating sow. PL. D. Thesis, UNN. Nottingham.
• 15. Hsuch, A. J., Adashi, E. Y., Jones, P. В. C., Welsh, T. H. Jr. (1984) Hormonal regulation of the differentiation of cultured ovarian granulosa cells. Endocr. Reviews 5. 76-127.
• 16. Ireland, J. J. (1987) Control of follicular growth and development. J. Reprod. Fert. Suppl. 34. 39-54.
• 17. Kirkpatrick, R. L., Howland, В. E., First, N. L., Casida, L. E. (1967) Ovarian and pituitary gland changes in gilts on two nutrition energy levels. J. Anim. Sci. 26. 358-364.
• 18. Krzymowski, T., Kotwica, J., Stefańczyk, S., Dębek, J., Czarnocki, J. (1981) Venousarterial counter current exchange of testosterone, estradiol and progesterone in sow’s ovarian vascular pedicle. Adv. Physiol. Sci. 20. 153- 157.
• 19. Krzymowski, T., Kotwica, J., Stefańczyk, S., Dębek, J., Czarnocki, J. (1932a) Steroid transfer from the ovarian vein to the ovarian artery in the sow. J. Reprod. Fert. 65. 451-466.
• 20. Krzymowski, T., Kotwica, J., Stefańczyk, S., Czarnocki, J., Dębek, J. (1982b) A subovarian exchange mechanism for the counter Current transfer of ovarian steroid hormones in the pig. J. Reprod. Fert. 65. 457-465.
• 21. McNatty, K. P. (1982) Ovarian follicular development from the onset of luteal regression in human and isheep. In: Follicular maturation and ovulation, pp. 1-13. Eds. R. Rolland, E. V. van Hall, S. G. Hillier, K. P. McNatty and J. Schoemaker, Excerpta Medica, Amsterdam.
• 22. Meinecke, B., Gips, H., Meinedke-Tillmann, S. (1937) Steroid hormones content of the developing preovulatory porcine follicle. Proceedings ot CEC Seminar on "Follicular growth and ovulation rate in farm animals". Eds: J. F. Roche and D. O'CaMaghan, Martinus NijKoff Publishers, Dordrecht, pp. 207-213.
• 23. Redmer, D. A., Christenson, R. K., Ford, J. J., Day, B. N. (1984) Effect of unilateral ovariectomy on compensatory ovarian hypertrophy, peripheral concentrations of follicle-stimulating hormone and luteinizing hormone, and ovarian venous concentrations of estradiol-17ß in prepubertal gilts; Biol. Reprod. 31. 59-66.24.
• 24. Redmar, D. A., Christenson, R. K., Ford, J. J., Day, B. N. (1985) Effect of follicular fluid treatment on follicle-stimulating hormone, luteinizing hormone and compensatory ovarian hypertrophy in prepubertal gilts. Biol. Reprod. 32. 111-119.
• 25. Richards, J. S. (1979) Hormone regulation of hormone receptors in ovarian follicular development. In: Ovarian Follicular Development and Function, pp. 225-242: Eds: A. R. Midgley and W. A. Sadler. Raven Press, New York.
• 26. Shaw, H. J. (1984) Control of ovarian function In lactating and weaned sows. Ph. D. Thesis, University of Nottingham.
• 27. Shaw, H. J., Foxcroft, G. R. (1985) Relationships between LH, FSH and prolactin secretion and reproductive activity in the weaned sow. J. Reprod. Fert. 75. 17-28.