Breed diversity in FSH, LH and testosterone regulation of testicular function and in libido of young adult rams on the southeastern Canadian prairies

Small Ruminant Research

Volumn 56, Issue 1-3, 2005, Pages 189-203

  Dickson, K A ^a   Sanford, L M ^a,b  

^a UNIVERSITY OF MANITOBA   (Canada)

^b Que H9H 4B7 ^*  (Canada)

Author keywords

Adult ram; Breeds; Gonadotrophic hormones; Seasonality; Testicular function

Indexed keywords

OVIS;

EID: 9644288221     PISSN: 09214488     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.smallrumres.2004.06.002     Document Type: Article

References (51)

1. Chase D.J., Schanbacher B.D., Lunstra D.D. Effects of pulsatile and continuous luteinizing hormone (LH) infusions on testosterone responses to LH in rams actively immunized against gonadotropin-releasing hormone. Endocrinology. 123:1988;816-826
2. Cheng K.W., Simaraks S., Palmer W.M. Characterization of a radioimmunoassay for ovine-FSH utilizing an antibovine FSH serum. J. Reprod. Fert. 61:1981;115-121
3. Courot M., Hochereau-de-Reviers M.-T., Monet-Kuntz C., Locatelli A., Pisselet C., Blanc M.R., Dacheux J.L. Endocrinology of spermatogenesis in the hypophysectomized ram. J. Reprod. Fert. 26(Suppl.):1979;165-173
4. Dacheux J.L., Pisselet C., Blanc M.R., Hochereau-de-Reviers M.-T., Courot M. Seasonal variations in rete testis fluid secretion and sperm production in different breeds of ram. J. Reprod. Fert. 61:1981;363-371
5. D'Occhio M.J., Brooks D.E. Seasonal changes in plasma testosterone concentration and mating activity in Border Leicester, Poll Dorset, Romney and Suffolk rams. Aust. J. Exp. Agric. Husb. 23:1983;248-253
6. D'Occhio M.J., Schanbacher B.D., Kinder J.E. Profiles of luteinizing hormone, follicle-stimulating hormone, testosterone and prolactin in rams of diverse breeds: effects of contrasting short (8L:16D) and long (16L:8D) photoperiods. Biol. Reprod. 30:1984;1039-1054
7. El-Alamy M.A., Foote R.H., Hare E. Sperm output and hormone concentrations in Finn and Dorset rams exposed to long- and short-day lighting. Theriogenology. 56:2001;839-854
8. Foster R.A., Ladds P.W., Hoffmann D., Briggs G.D. The relationship of scrotal circumference to testicular weight in rams. Aust. Vet. J. 66:1989;20-22
9. Glover, T.D., D'Occhio, M.J., Millar, R.P., 1990. Male life cycle and seasonality. In: Lamming, G.E. (Ed.), Marshall's Physiology of Reproduction, Reproduction in the Male, Vol. 2, Churchill Livingstone, NY, pp. 213-378.
10. Hochereau-de Reviers M.-T., Perreau C., Lincoln G.A. Photoperiodic variations of somatic and germ cell populations in the Soay ram testis. J. Reprod. Fert. 74:1985;329-334
11. Hochereau-de Reviers M.-T., Perreau C., Pisselet C., Fontaine I., Monet-Kuntz C. Comparisons of endocrinological and testis parameters in 18-month-old Ile de France and Romanov rams. Dom. Anim. Endocrinol. 7:1990;63-73
12. Hochereau-de Reviers M.-T., Perreau C., Pisselet C., Pelletier J. Effect of a 2-month light cycle regimen on testicular parameters of adult Ile-de-France rams. Microsc. Res. Tech. 20:1992;268-273
13. Howland B.E. Effect of restricted feed intake on LH levels in female rats. J. Anim. Sci. 34:1972;445-447
14. Islam A.B.M.M., Land R.B. Seasonal variation in testis diameter and sperm output of rams of breeds of different prolificacy. Anim. Prod. 25:1977;311-317
15. Jeffcoate I.A., Rawlings N.C., Howell W.E. Duration of the breeding season and response to reproductive manipulation in five breeds of sheep under northern prairie conditions. Theriogenology. 22:1984;279-290
16. Kilgour R.J., Courot M., Pisselet C., Dubois M.P., Sairam M.R. Inhibition of FSH but not LH affects spermatogenesis in the mature ram. Anim. Reprod. Sci. 34:1994;253-264
17. Knight T.W. Methods for the indirect estimation of testes weight and sperm numbers in Merino and Romney rams. NZ J. Agric. Res. 20:1977;291-296
18. Land R.B. The mating behaviour and semen characteristics of Finnish Landrace and Scottish Blackface rams. Anim. Prod. 12:1970;551-560
19. Lincoln, G.A., 1989a. Seasonal aspects of testicular function. In: Burger, H., De Kretser, D. (Eds.), The Testis, 2nd ed. Raven, New York, pp. 329-385.
20. Lincoln G.A. Seasonal cycles in testicular activity in Mouflon, Soay sheep and domesticated breeds of sheep: breeding seasons modified by domestication. Zool. J. Linn. Soc. 95:1989;137-147
21. Lincoln G.A., Lincoln C.E., McNeilly A.S. Seasonal cycles in the blood plasma concentration of FSH, inhibin and testosterone, and testicular size in rams of wild, feral and domesticated breeds of sheep. J. Reprod. Fert. 88:1990;623-633
22. Lino B.F., Braden W.H. The output of spermatozoa in rams. 1. Relationship with testicular output of spermatozoa and effect of ejaculations. Aust. J. Biol. Sci. 25:1972;351-358
23. Mandiki S.N.M., Derycke G., Bister J.L., Paquay R. Influence of season and age on sexual maturation parameters of Texel, Suffolk and Ile-de-France rams. 1. Testicular size, semen quality and reproductive capacity. Small Ruminant Res. 28:1998;67-79
24. Mandiki S.N.M., Derycke G., Bister J.L., Paquay R. Influence of season and age on sexual maturation parameters of Texel, Suffolk and Ile-de-France rams. 2. Circulating concentrations of follicle stimulating hormone, luteinizing hormone, prolactine and testosterone. Small Ruminant Res. 28:1998;81-88
25. Mickelsen W.D., Paisley L.G., Dahmen J.J. Seasonal variations in scrotal circumference, sperm quality, and sexual ability in rams. J. Am. Vet. Med. Assoc. 181:1982;376-380
26. Monet-Kuntz C., Hochereau-de Reviers M.-T., Pisselet C., Perreau C., Fontaine I., Schanbacher B.D. Endocrine parameters, hormone receptors, and functions of the testicular interstitium and seminiferous epithelium in estradiol-immunized Ile-de-France rams. J. Androl. 9:1988;278-283
27. Muduuli D.S., Sanford L.M., Palmer W.M., Howland B.E. Secretory patterns and circadian and seasonal changes in luteinizing hormone, follicle stimulating hormone, prolactin and testosterone in the male pygmy goat. J. Anim. Sci. 49:1979;543-553
28. Niswender G.D., Reichert L.E. Jr., Midgely A.R. Jr., Nalbandov A.V. Radioimmunoassay for bovine and ovine LH. Endocrinology. 84:1969;1166-1173
29. Ortavant R., Bocquier F., Pelletier J., Ravault J.P., Thimonier J., Volland-Nail P. Seasonality of reproduction in sheep and its control by photoperiod. Aust. J. Biol. Sci. 41:1988;69-85
30. Parthasarathy V., Price E.O., Orihuela A., Dally M.R., Adams T.E. Passive immunization of rams (Ovis aries) against GnRH: effects on antibody titer, serum concentrations of testosterone, and sexual behavior. Anim. Reprod. Sci. 71:2002;203-215
31. Pisselet C., Perreau C., Hochereau-de Reviers M.-T. Relationship between rete testis fluid secretion and testicular structure in the ram. Reprod. Nutr. Dev. 24:1984;483-486
32. Poulton A.L., Robinson T.J. The response of rams and ewes of three breeds to artificial photoperiod. J. Reprod. Fert. 79:1987;609-626
33. Price C.A., Cooke G.M., Sanford L.M. Influence of season and low-level oestradiol immunoneutralization on episodic LH and testosterone secretion and testicular steroidogenic enzymes and steroidogenic acute regulatory protein in the adult ram. J. Reprod. Fert. 118:2000;251-262
34. Rhim T.-J., Kuehl D., Jackson G.L. Seasonal changes in the relationships between secretion of gonadotropin-releasing hormone, luteinizing hormone, and testosterone in the ram. Biol. Reprod. 48:1993;197-204
35. Sanford L.M., Baker S.J. Enhanced testosterone secretion in adult rams after establishment of a high-frequency, low-amplitude pattern of LH pulses in the nonbreeding season occurs without changes in the number or binding affinity of testicular LH receptors. Acta Endocrinologica (Copenh). 122:1990;55-61
36. Sanford L.M., Ponzilius K.-H. The pattern of LH release in the adult ram influences the testicular steroidogenic response to individual LH pulses and is regulated by testosterone negative feedback. J. Androl. 10:1989;1-8
37. Sanford L.M., Howland B.E., Palmer W.M. Seasonal changes in the endocrine responsiveness of the pituitary and testes of male sheep in relation to their patterns of gonadotropic hormone and testosterone secretion. Can. J. Physiol. Pharmacol. 62:1984;827-833
38. Sanford L.M., Leggee D.G., Melnyk P.M. Maintaining a high physiological rate of testosterone secretion in the adult ram by estradiol immunoneutralization partially prevents testicular regression. Can. J. Anim. Sci. 71:1991;1099-1109
39. Sanford L.M., Voglmayr J.K., Vale W.W., Robaire B. Photoperiod-mediated increases in serum concentrations of inhibin, follicle-stimulating hormone, and luteinizing hormone are accentuated in adult shortened-scrotum rams without corresponding decreases in testosterone and estradiol. Biol. Reprod. 49:1993;365-373
40. Sanford L.M., Price C.A., Leggee D.G., Baker S.J., Yarney T.A. Role of FSH, numbers of FSH receptors and testosterone in the regulation of inhibin secretion during the seasonal testicular cycle of adult rams. Reproduction. 123:2002;269-280
41. SAS, 1989. SAS/STAT User's Guide, Version 6, 4th ed. Statistical Analysis System Institute Inc., Cary, NC.
42. Schanbacher B.D., Lunstra D.D. Seasonal changes in sexual activity and serum levels of LH and testosterone in Finnish Landrace and Suffolk rams. J. Anim. Sci. 43:1976;644-650
43. Setchell B.P., Locatelli A., Perreau C., Pisselet C., Fontaine I., Kuntz C., Saumande J., Fontaine J., Hochereau-de Reviers M.-T. The form and function of the Leydig cells in hypophysectomized rams treated with pituitary extract when spermatogenesis is disrupted by heating the testes. J. Endocrinol. 131:1991;101-112
44. Setchell, B.P., Maddocks, S., Brooks, D.E., 1994. Anatomy, vasculature, innervation, and fluids of the male reproductive tract. In: Knobil, E., Neill, J.D. (Eds.), The Physiology of Reproduction, 2nd Edition, Raven, New York, pp. 1128-1136.
45. Signoret, J.-P., Balthazart, J., 1993. Sexual behavior. In: Thibault, C., Levasseur, M.C., Hunter, R.H.F. (Eds.), Reproduction in Mammals and Man, Ellipses, Paris, pp. 531-552.
46. Simaraks, S., 1978. Hormone levels in prepubertal ewe lambs and in mature ewes throughout the breeding season. Ph.D. Thesis, The University of Manitoba, Winnipeg.
47. Steel, R.G.D., Torrie, J.H., 1960. Principles and Procedures of Statistics. McGraw-Hill, New York, pp. 190-191.
48. Tilbrook A.J., de Kretser D.M., Clarke I.J. Studies on the testicular source of inhibin and its route of secretion in rams: failure of the Leydig cell to secrete inhibin in response to a human chorionic gonadotrophin/LH stimulus. J. Endocrinol. 130:1991;107-114
49. Webster G.M., Haresign W. Seasonal changes in LH and prolactin concentrations in ewes of two breeds. J. Reprod. Fert. 67:1983;465-471
50. Wheeler A.G., Land R.B. Seasonal variation in oestrus and ovarian activity of Finnish Landrace Tasmanian Merino and Scottish Blackface ewes. Anim. Prod. 24:1977;363-376
51. Yarney T.A., Sanford L.M. The reproductive-endocrine response of adult rams to sexual encounters with estrual ewes is season dependent. Horm. Behav. 17:1983;169-182