Sütçü ineklerde sıcaklık stresinin döl verimi üzerine etkisi
Bu derlemede; yaz aylarında sütçü ineklerde artış gösteren infertilitede etkili olan sıcaklık stresinin döl verimi üzerine olan olumsuz etkileri, etki etme şekilleri ve bu olumsuz etkileri azaltmanın yollan tartışılmaktadır.
The effect of heat stres on reproduction inthe dairy cows
In this review article, negative and pathways of effect of heat stres on reproductive performance of dairy cows with increased infertilty in summer season, and the aproaches how to decrease these negative effects have been discussed.
___
- 1.Alnmier, M. De Rosa, G., Grasso, F., Napolitana, F., Bordi, A.: Effect of climate on the response of three oestrus synchronisation techniques in lactating dairy cows. Anim Reprod Sci, 2002; 71: 157-68.
- 2.De Rensis, F. Scaramuzzi, R.J.: Heat stress and seasonal effects on reproduction in the dairy cow-a review. Theriogenology, 2003; 60: 1139-51.
- 3.De Rensis, F. Marconi, P., Capelli, T., Gatti, F., Facciolongo, F., Franzini S., et al.:Fertility in postpartum dairy cows in winter or summer following estrous synchronization and fixed time A.I. after the induction of an LH surge with GnRH or hCG. Theriogenology, 2002; 58: 1675-87.
- 4.Drew, B.: Practical nutrition and managment of heifers and high yielding dairy cows for optimal fertility. Cattle Practice, 1999; 7: 243-48.
- 5.Gauthier, D.: The influence of season and shade on estrous behaviour, timing of preovulatory LH surge and the pattern of progesterone secretion in FFPN and Creole heifers in atropical climate. Reprod Nutr Dev, 1986; 26: 767-75.
- 6.Gilad, E., Meidan, R., Berman, A., Graber, Y., Wolfenson, D.: Effect of heat stress on tonic and GnRH-induced gonadotrophin secretion in relation to concentration of estradiol in plasma of cyclic cows. J Reprod Fertil, 1993; 99: 315-21.
- 7.Güzeloğlu, A. Ambrose, J.D., Kassa, T., Diaz, T., Thatcher, M.J., Thatcher, W.W. Long term follicular dynamics and biochemical characteristics of dominant follicles in dairy cows subjected to acute heat stress. Anim Reprod Sci, 2001; 66: 15-34.
- 8.Gwazdauskas, F.C. Thatcher, W.W., Kiddy, C.A., Pape, M.J., Wilcox, C.J.: Hormonal pattern during heat stress following PGF2a-tham salt induced luteal regression in heifers. Theriogenology, 1981; 16: 271-85.
- 9.Hansen, P.J.: Strategies for enchancing reproduction of lactating dairy cows exposed to heat stress. In: Proceedings of the 16th Annual Convention American Embryo Transfer Association. Madison; 1997. p. 62-72.
- 10.Howell, J.L. Fuquay, J.W. Smith, A.E.: Corpus luteum growth and function in lactating Holstein cows during spring and summer. J Dairy Sci, 1994;77:735-39.
- 11.Jolly, P.D. McDougall, S., Fitzpatrick, L.A., Macmillan, K.L., Entwhitsle, K.: Physiological effect of under nutrition on postpartum anoestrous in cows. J Reprod Fertil Suppl, 1995; 49: 477-92.
- 12.Lamming, G.E. Royal, M.D.: Ovarian hormone patterns and subfertility in dairy cows. In: Diskin MG, Editor. Fertility in the high-producing dairy cow, vol. 26. BSAS Endiburgh: Occasional Publication: 2001 p. 105-118.
- 13.Roth, Z. Meidan, R. Braw-Tal, R. Wolfenson, D. Immediate and delayed effect of heat stress on follicular development and its association with plasma FSH and inhibin concetration in cows. J Reprod Fertil, 2000; 120: 83-90.
- 14. Roth, Z. Meweidan, R. Shaham-Albalancy, A. Braw-Tal, R. Wolfenson, D.: Delayed effect of heat stress on steroid production in medium-size and preovulatory bovine follicles. Reproduction, 2001; 121: 745-51.
- 15.Wilson, S.J. Marion, R.S. Spain, J.N., Spiers, D.E., Reisler, D.H, Lucy, M.C.. Effect of controlled heat stress on ovarian function in dairy cattle: I.Lactating cows. J dairy Sci, 1998; 1:2124-31.
- 16.Wise, M.E. Armstrong, D.V., Huber, J.T., Hunter, R., Wiersma, F.: Hormonal alterations in the lactating dairy cow in response to thermal stress. J Dairy Sci, 1988; 71: 2480-85.
- 17.Wolfenson, D. Lew, B.J. Thatcher, W.W., Graber, Y., Meidan, R.: Seasonal and acute heat stress effects on steroid production by dominant follicles in cow. Anim Reprod Sci, 1997; 47: 9-19.
- 18.Younas, M. Fuquay, J.W., Smith, A.E., Moore, A.B.: Estrus and endocrine responses of lactating Holsteins to forced ventilation during summer. J Dairy Sci, 1993; 76: 430-34.