Changes in circulating hormone concentrations, testes histology and testes ultrasonography during sexual maturation in beef bulls

Theriogenology

Volumn 46, Issue 2, 1996, Pages 345-357

  Evans, A C O ^a,c   Pierson, R A ^b   Garcia, A ^a   McDougall, L M ^a   Hrudka, F ^a   Rawlings, N C ^a  

^a UNIVERSITY OF SASKATCHEWAN   (Canada)

^b ROYAL UNIVERSITY HOSPITAL   (Canada)

^c Department of Obstetrics Gynecology   (United States)

Author keywords

Bulls; Hormones; Puberty; Testes; Ultrasonography

Indexed keywords

FOLLITROPIN; LUTEINIZING HORMONE; TESTOSTERONE;

ANIMAL EXPERIMENT; ARTICLE; CATTLE; ECHOGRAPHY; FOLLITROPIN BLOOD LEVEL; GONADOTROPIN RELEASE; LUTEINIZING HORMONE BLOOD LEVEL; NONHUMAN; SEMINIFEROUS TUBULE; SEXUAL MATURATION; SPERMATOGENESIS; SPERMATOZOON MATURATION; TESTIS DEVELOPMENT; TESTIS SIZE; TESTIS WEIGHT; TESTOSTERONE BLOOD LEVEL; TIME;

ANIMALIA; BOS TAURUS;

EID: 0030585794     PISSN: 0093691X     EISSN: None     Source Type: Journal    
DOI: 10.1016/0093-691X(96)00190-2     Document Type: Article

References (30)

1. 1. Abdel-Raouf M. The postnatal development of the reproductive organs in bulls with special reference to puberty. Acta Endocrinol 1960; 49(Suppl): 1-109.
2. 2. Cartee RE, Gray BW, Powe TA, Hudson RS, Whitesides J. Preliminary implications of B-mode ultrasonography of the testicles of beef bulls with normal breeding soundness examinations. Theriogenology 1989; 31:1149-1158.
3. 3. Cartee RE, Powe TA, Gray BW, Hudson RH, Kuhlers, DL. Ultrasonographic evaluation of normal boar testicles. Am J Vet Res 1986; 47:2543-2548.
4. 4. Chandolia RK, Rawlings NC, Evans, ACO. Inhibition of the early rise of LH secretion in bull calves suppresses testicular development. Biol Reprod 1994; 50:86 abstr.
5. 5. Cook SJ, Rawlings NC, Kennedy RI. Quantitation of six androgens by combined high performance liquid chromatography and radioimmunoassay. Steroids 1982; 40:369-379.
6. 6. Curtis SK, Amann RP. Testicular development and establishment of spermatogenesis in Holstein bulls. J Anim Sci 1981; 53:1645-1657.
7. 7. Eilts BE, Pechman RD. B-mode ultrasound observations of bull testes during breeding soundness examinations. Theriogenology 1988; 30:1169-1176.
8. 8. Eilts BE, Pechman RD, Taylor HW, Usenik EA. Ultrasonographic evaluation of induced testicular lesions in male goats. Am J Vet Res 1989; 50:1361-1364.
9. 9 Eilts BE, Williams DB, Moser EB. Ultrasonic measurement of canine testes. Theriogenology 1993; 40:819-828.
10. 10. England GCW. Relationship between ultrasonographic appearance testicular size spermatozoal output and testicular lesions in the dog. J Small Anim Pract 1991; 32:306-311.
11. 11. Evans ACO, Currie WD, Rawlings NC. Effects of naloxone on circulating gonadotrophin concentrations in prepubertal heifers. J Reprod Fertil 1992; 96:847-855.
12. 12. Evans ACO. Currie WD, Rawlings NC. Opioidergic regulation of gonadotrophin secretion in the early prepubertal bull calf J Reprod Fertil 1993, 99:45-51.
13. 13. Evans ACO, Davies FJ, Nasser LF, Bowman P, Rawlings NC. Difference in early patterns of gonadotrophin secretion between early and late maturing bulls, and changes in semen characteristics at puberty. Theriogenology 1995; 43:569-578.
14. 14. Ginther OJ. Ultrasonic imaging and reproductive events in the mare. Cross Plains, Wisconsin: Equiservices 1986, 1-65.
15. 15. Hamm B, Fobbe F, Loy V. Testicular cysts differentiation with US and clinical findings. Radiology 1988; 168:19-23.
16. 16. Lunstra DD, Ford RR, Echternkamp SE. Puberty in beef bulls: hormone concentrations, growth, testicular development, sperm production and sexual aggressiveness in bulls of different breeds. J Anim Sci 1978; 46:1054-1062.
17. 17. McCarthy MS, Hafs HD, Convey EM. Serum hormone patterns associated with growth and sexual development in bulls. J Anim Sci 1979; 49:1012-1020.
18. 18. Miskin M, Bain J. B-mode ultrasonic examination of the testes. J Clin Ultrasound 1974; 2:307-311.
19. 19. Pechman RD, Eilts BE. B-mode ultrasonography of the bull testicle. Theriogenology 1987; 27:431-441.
20. 20. Pierson RA, Adams GP, Rawlings NC. Computer assisted image analysis, diagnostic ultrasonography and ovulation induction: Strange bedfellows. Theriogenology 1995; 43:105-112.
21. 21. Pugh CR, Konde LJ, Park, RD. Testicular ultrasound in the normal dog. Vet Radiol 1990; 31:195-199.
22. 22. Rawlings NC, Chandolia RK, Evans ACO. The involvement of dopaminergic and opioidergic neuronal system in the control of the early rise in gonadotrophin secretion in bull calves. Biol Reprod 1994; 50:69 abstr.
23. 23. Rawlings NC, Evans ACO. Androgen negative feedback during the early rise in luteinizing hormone secretion in bull calves. J Endocrinol 1995; 145:243-249.
24. 24. Rawlings NC, Fletcher PW, Henricks DM, Hill JR. Plasma luteinizing hormone (LH) and testosterone levels during sexual maturation in beef bull calves. Biol Reprod 1978; 19:1108-1112.
25. 25 Rawlings NC, Hafs HD, Swanson LV. Testicular and blood plasma androgens in Holstein bulls from birth through puberty. J Anim Sci 1972; 34:435-440.
26. 26. Rawlings NC, Jeffcoate IA, Rieger DL. The influence of estradiol-17β and progesterone on peripheral serum concentrations of luteinizing hormone and follicle stimulating hormone in the ovariectomized ewe. Theriogenology 1984; 22:473-488.
27. 27. Rodriguez RE, Wise ME. Ontogeny of pulsatile secretion of gonadotropin-releasing hormone in the bull calf during infantile and pubertal development. Endocrinology 1989; 124:248-256.
28. 28. Schams D, Schallenberger E, Gome S, Karg H. Endocrine patterns associated with puberty in male and female cattle. J Reprod Fertil 1981; 30(Suppl):103-110.
29. 29. Wise ME, Rodriguez RE, Kelly CM. Gonadal regulation of LH secretion in prepubertal bull calves. Dom Anim Endocrinol 1987; 4:175-181.
30. 30. Wolf FR, Almquist JO, Hale EB. Pubertal behaviour and pubertal characteristics of beef bulls on a high nutrition allowance. J Anim Sci 1965; 224:761-765.