Monthly variation of plasma concentrations of testosterone and thyroid hormones and reproductive characteristics in three breeds of Iranian fat-tailed rams throughout one year

Pakistan Journal of Biological Sciences

Volumn 10, Issue 19, 2007, Pages 3420-3424

  Tajangookeh, Hamid Deldar ^a   Shahneh, Ahmad Zare ^a   Shahrebabak, Mohammad Moradi ^a   Shakeri, Malek ^a  

^a UNIVERSITY OF TEHRAN   (Iran)

Author keywords

Fat tailed ram; Scrotal circumference; Semen; Testosterone; Thyroid hormones

Indexed keywords

EID: 35948999201     PISSN: 10288880     EISSN: 18125735     Source Type: Journal    
DOI: 10.3923/pjbs.2007.3420.3424     Document Type: Article

References (21)

1. Billings, H.J., C. Viguie, F.J. Karsch, R.L. Goodman, J.M. Connors and G.M. Anderson, 2002. Temporal requirement of thyroid hormone for seasonal change in LH secretion. Endocrinol., 143: 2618-2625.
2. Evans, G. and T.J. Robinson, 1980. Reproductive potential and endocrinological responses of sheep kept under controlled lighting. II. Pituitary and gonadal responses of ewes and rams to a six-monthly light cycle. Anim. Reprod. Sci., 3: 39-56.
3. Evans, G. and W.M.C. Maxwell, 1987. Salmon's Artificial Insemination of Sheep and Goats. Butterworth. Sydney, pp: 408.
4. Hafez, E.S.E., 1959. Reproductive capacity of farm animals in relation to climate and nutrition. J. Agric. Sci., 42: 606-614.
5. Ibrahim, S.A., 1997. Seasonal variation in semen quality of local and crossbred rams raised in the United Arab Emirates. Anim. Reprod. Sci., 49: 161-170.
6. Kafi, M., M. Safdarian and M. Hashemi, 2004. Seasonal variation in semen characteristics, scrotal circumference and libido of Persian Karakul ram: Technical note. Small Rum. Res., 53: 133-139.
7. Karagianidis, A., S. Varsakeli, C. Alexpoulos and I. Amarantidis, 2000. Seasonal variation in semen characteristics of Chois and Friesian rams in Greece. Small Rum. Res., 37: 127-130.
8. Lincoln, G.A., C.E. Lincoln and A.S. MC Neilly, 1990. Seasonal cycle in the blood plasma concentration of FSH, inhibin and testosterone and testicular size in ram of wild feral and domesticated breeder sheep. J. Reprod. Fertil., 88: 623-633.
9. Lincoln, G.A. and W. Daividson, 1997. The relationship between sexual and aggressive behavior, pituitary and testicular activity during the seasonal sexual cycle of photoperiod. J. Reprod. Fertil., 49: 267-276.
10. Mandiki, S.N.M., G. Derecke, J.L. Bister and R. Paquqay, 1998. Influence of season and age on sexual maturation parameters in Texel, Saffolk and Ile-de Frence rams 2. Circulation concentrations of follicle stimulating hormone, lutenizing hormone, prolactine and testosterone. Small Rum. Res., 28: 81-88.
11. NRC, 1985. Nutrient Requirement of Sheep. Nutritional Academy Press, USA.
12. Parkinson, T.J. and B.K. Follett, 1994. Effect of thyroidectomy upon seasonality in rams. J. Reprod. Fertil., 101:51-58.
13. Perez-Clariget, R., M. Forsbergand and H. Rodringuez-Martinez, 1998. Seasonal variation in live weight, testosterone, LH secretion, melatonin and thyroxine in Merino and Corridale rams in subtropic climate. Acta Vet. Scand., 39: 35-47.
14. SAS, 1996. SAS/STAT Software: Change and Enhancement Through Release 6.12. SAS Institute Inc. Cary, NC.
15. Souza, M.I.L., S.D. Bicudo, L.F. Urib-Velasquez and A.A. Ramos, 2002. Circadian and circannual rhythm of T3 and T4 secretion in Porwarth-Ideal rams. Small Rum. Res., 46: 1-5.
16. Taha, T.A., E.I. Abdle-Gawad and M.A. Ayoub, 2000. Monthly variation in some reproductive parameters of barki and Awassi rams throughout 1 years under subtropical conditions. 1. Semen characteristics and hormonal levels. Anim. Sci., 71: 317-324.
17. Thiery, J.C., P. Chemineau, X. Hernandez, M. Migaud and B. Malpaux, 2002. Neuroendocrine interaction and seasonality. Domes. Anim. Endocrinol., 23: 87-100.
18. Toe, F., J.E.O. Rege, E. Mukasa-Mugerwa, S. Tembely, D. Anindo, R.L. Baker and A. Lahlou-Kassi, 2000. Reproductive characteristics of Ethiopian highland sheep. I. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs. Small Rum. Res., 36: 227-240
19. Webster, J.R., S.M. Moenter, C.J. Woodfill and F.J. Karsch, 1991. Role of thyroid gland in seasonal reproduction. II. Thyroxine allows a season-specific suppression of gonadotropin secretion in sheep. Endocrinology, 129: 176-183.
20. Zamiri, M.J. and J. Izadifard, 1997. Seasonal and testicular measurements in Mehraban and Ghezal rams. Iran Agric. Res., 16: 51-58.
21. Zamiri, M.J. and H.R. Khodaei, 2005. Seasonal thyroidal activity and reproductive characteristics of Iranian fat-tailed rams. Anim. Reprod. Sci., 88: 245-255.