Seasonal Variation in Live Weight, Testes Size, Testosterone, LH Secretion, Melatonin and Thyroxine in Merino and Corriedale Rams in a Subtropical Climate;Säsongsmässig variation i levande vikt, testikelstorlek, testosteron, LH, melatonin och tyroxin hos Merino och Corriedalebaggar under subtropiska förhållanden

Acta Veterinaria Scandinavica

Volumn 39, Issue 1, 1998, Pages 35-47

  Perez R ^a,b   Forsberg, M ^b   Rodriguez Martinez, H ^b  

^a UNIVERSITY OF URUGUAY   (Uruguay)

^b SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES   (Sweden)

Author keywords

reproduction; seasonality

Indexed keywords

HORMONE; LUTEINIZING HORMONE; MELATONIN; TESTOSTERONE; THYROXINE;

ANIMAL; ARTICLE; BLOOD; BODY WEIGHT; CLIMATE; HISTOLOGY; MALE; ORGAN SIZE; PHYSIOLOGY; SEASON; SECRETION; SHEEP; SPECIES DIFFERENCE; TESTIS; URUGUAY;

ANIMALS; BODY WEIGHT; CLIMATE; HORMONES; LUTEINIZING HORMONE; MALE; MELATONIN; ORGAN SIZE; SEASONS; SHEEP; SPECIES SPECIFICITY; TESTIS; TESTOSTERONE; THYROXINE; URUGUAY;

EID: 0001687131     PISSN: 0044605X     EISSN: 17510147     Source Type: Journal    
DOI: 10.1186/BF03547805     Document Type: Article

References (33)

1. Arendt J, Symons AM, English J, Poulton L, Tobler I: How does melatonin control seasonal reproductive cycles? Reprod. Nutr. Develop. 1988, 28 (2B), 387–397.
2. Bietti A, Pedrana G, Gastel MT, Morana JA, Castril-lejo A, Piaggio J, Forsberg M, Rodriguez-Martinez H: La suplementación nutricional evita la caida invernal en la reproducción estacionai dei carnero Corriedale uruguayo? (Nutritional supplement can avoid the winter decreasing of the seasonal reproduction in Uruguyan Corriedale rams?) 2do Simp. Intern. Reprod. Anim., 31 de octubre - 2 de noviembre, Carlos Paz, Córdoba, Argentina. 1996, p. 247.
3. Castrillejo A, Morana JA, Bietti A, Gastel T, Molina JR, Forsberg M, Rodriguez-Martinez H: Onset of spermatogenesis in Corriedale ram lambs under extensive rearing conditions in Uruguay. Acta vet. scand. 1995, 36, 161–173.
4. Chandrasekhar MJ, D'Occhio MJ, Setchell BP: Reproductive hormone secretion and spermatogenic function in thyroidectomized rams receiving graded doses of exogenous thyroxine. J. Endocr. 1986, 111, 245–253. DOI: 10.1677/joe.0.1110245
5. D'Occhio MJ, Brooks DE: Seasonal changes in plasma testosterone concentration and mating activity in Border Leicester, Poll Dorset, Romney and Suffolk rams. Aust. J. Exp. Agric. Anim. Husb. 1983,23, 248–253. DOI: 10.1071/EA9830248
6. Forsberg M, Tagle R, Madej A, Molina JR, Carlsson M-A: Radioimmunoassay of bovine, ovine and porcine luteinizing hormone with a monoclonal antibody and a human tracer. Acta vet. scand. 1993, 34, 225–262.
7. Gastel T, Bielli A, Pérez R, Lopez A, Castrillejo A, Tagle R, Franco J, Laborde D, Forsberg M, Rodrigues-Martínez H: Seasonal variations in testicular morphology in Uruguyan Corriedale rams. Anim. Reprod. Sci. 1995, 40, 59–75.
8. Gibbons A, Vinent JG, Willems P, González R: Variación estacionai de la actividad reproductiva del carnero Merino Australiano en la Patogonia. (Seasonal changes in reproductive activity of Australian Merino in Patagonia). Rev. Arg. Prod. Anim. 1991,11, 449–455.
9. Glover TD, D 'Occhio MJ, Millar RP: Male life cycle and seasonality. In: Lamming G.E. (Editor), “Marshall's Physiology of Reproduction”, Vol. II: Reproduction in the male. 4th Ed., Churchill-Livingstone, London, 1990 pp. 213–378.
10. Hötzel MJ, Martin GB, Walkden-Brown SW, Fisher JS: Nutritional effects on testicular growth and LH and FSH secretion in Suffolk and Merino rams during the breeding and the non-breeding seasons. Twentysixth Annual Conference of The Australian Society for Reproductive Biology Inc. September 26-28, Brisbane, Australia 1994.
11. Islam ABMM, Land RB: Seasonal variation in testis diameter and sperm output of rams of breeds of different prolificacy. Anim. Prod. 1977, 25, 311–317.
12. Lincoln G A: Changes in pituitary responsiveness to luteinizing hormone releasing in rams exposed to artificial photoperiods. J. of Endocrinology 1977, 73, 519–527. DOI: 10.1677/joe.0.0730519
13. Lincoln GA, Lincoln CE, McNeilly AS: Seasonal cycles in the blood plasma concentration of FSH, inhibin and testosterone size in rams of wild, feral and domesticated breeds of sheep. J. Reprod. Fert. 1990, 88, 623–633. DOI: 10.1530/jrf.0.0880623
14. Lincoln GA, Short RV: Seasonal breeding: Nature's contraceptive. Recent. Prog. Horm. Res. 1980, 36, 1–52.
15. Martin GB, Ford JR, Purvis IW: Environmental and genetic factors affecting reproductive activity in the Merino ram. In: Reproductive Physiology of Merino Sheep-Concepts and Consequences. School of Agriculture (Animal Science). The University of Western Australia, Perth. 1990.
16. Martin GB, Sutherland SRD, Lindsay DR: Effects of nutritional supplements on testicular size and the secretion of LH and testosterone in Merino and Booroola rams. Anim. Reprod. Sci., 1987, 12, 267–281. DOI: 10.1016/0378-4320(87)90098-4
17. Martin GB, Tjondronegoro DW, Blackberry MA: Effects of nutrition on testicular size and the concentrations of gonadotrophins, testosterone and inhibin in plasma of mature sheep. J. Reprod. Fert. 1994a, 101, 121–128. DOI: 10.1530/jrf.0.1010121
18. Martin GB, Walkden-Brown SW, Boukhliq R, Tjondronegoro S, Miller DW, Fisher JS, Hötzel MJ, Restall BJ, Adams NR: Non-photoperiodic inputs into seasonal breeding in male ruminants. In Perspective in Comparative Endocrinology, National Research Council of Canada, Ottawa, 1994b, pp. 574–585.
19. Masters G, Fels HE: Seasonal changes in the testicular size og grazing rams. Anim. Prod, in Aust. 1984,75,444–447.
20. Mickelsen WD, Paisley LG, Dahmen JJ: The effects of season on the scrotal circumference and sperm motility and morphology in rams. Theriogenol-ogy, 1981,16, 45–51. DOI: 10.1016/0093-691X(81)90112-6
21. Parkinson TJ, Douthwaite JA, Follet BK: Responses of prepubertal and mature rams to thyroidectomy. J. Reprod. Fert. 1995,104, 51–56. DOI: 10.1530/jrf.0.1040051
22. Parkinson TJ, Follet BK: Effect of thyroidectomy upon seasonality in rams. J. Reprod. Fert. 1994, 101, 51–58. DOI: 10.1530/jrf.0.1010051
23. Parkinson TJ, Follet BK: Thyriodectomy abolishes seasonal testicular cycles in Soay rams. Proc. R. Soc. Lond. B. Biol. Sci. 1995, Jan 23,259 (1354), 1–6. DOI: 10.1098/rspb.1995.0001
24. Pelletier J, Almeida G: Short light cycles induce persistent reproductive activity in Ile-de-France rams. J. Reprod. Fert. Suppl. 1987, 34, 215–226.
25. Pelletier D, Gamier DH, de Riviers MM, Terqui M, Ortavant R: Seasonal variation in LH and testosterone release in rams of two breeds. J. Reprod. Fert. 1982, 64, 341–436.
26. Pérez Clariget R, López A, Castrillejo A, Bielli A, Laborde D, Gastel T, Tagle R, Queirolo D, Franco J, Forsberg M, Rodriguez-Martinez H: Reproductive seasonality of Corriedale rams under extensive rearing conditions. Acta vet. scand. 1997,38, 109–117
27. Pérez Clariget R, López A, Castrillejo A, Forsberg M: Effect of season and feeding level on live weight, testes size and testosterone concentration in Uruguyan Corriedale rams. Proc. 13th International Congress on Animal Reproduction, June 30-July 4, Sydney, Australia. 1996, P1–6.
28. Poulton AL, Robinson TJ: The response of rams and ewes of three breeds to artifical photoperiod. J. Reprod. Fert. 1987, 79, 609–626. DOI: 10.1530/jrf.0.0790609
29. Ritar AJ, Adams NR, Sanders MR: Effect of lupin feeding on LH, testosterone and testes. In: Reproduction in Sheep. D.R. Lindsay and D.T. Pearce (eds.), Cambridge University Press. 1984, pp. 76–78.
30. Rodriguez A: Crecimiento estacionai de la en ovinos Merino e Ideal en pastoreo (Wool seasonal growth in Merino and Polwarth sheep under forage conditions). Prod. Ovina, SUL, Paysandú, Uruguay. 1989, 1, 45–50.
31. Sanford LM, Palmer WM, Howland BE: Influence of sexual activity on serum levels of LH and testosterone in the ram. Canadian J. Anim. Sci. 1974, 54, 579–585. DOI: 10.4141/cjas74-070
32. Xu ZZ, McDonald MF, McCutcheon SN, Blair HT: Seasonal variation in testis size, gonadotrophin secretion and pituitary responsiveness to GnRH in rams of two breeds differing in time of onset the breeding season. Anim. Reprod. Sci. 1991, 26, 281–292. DOI: 10.1016/0378-4320(91)90053-3
33. Zarco, L, Stabenfeldt GH, Kindahl H, Quirke JF, Granström E: Persistence of luteal activity in the non-pregnant ewe. Anim. Reprod. Sci. 1984, 7, 1-3, 245–267.