Inducing earlier cycling of mares using artificial light program
A review
Keywords:
artificial light program, breeding season, estrus, mareAbstract
Mares are seasonally polyestrus, that is, they have multiple heat cycles during certain seasons of the year. Most mares do not cycle during the shorter days of fall, winter and early spring. Mares enter their ovulatory cycle in the spring in response to increased daylength. Although the natural breeding season for mares is in spring, Thoroughbred breeders try to gain early foal, in early summer. Horse breeders (especially Thoroughbred and trotter breeders) are looking for ways to shorten winter anestrus, therefore they have found this can be done by the use of artificial light to extend sunlight. Research suggests that extending the day length (from 16 to 18 hours) by adding light starting in the late afternoon is better than turning the lights on earlier in the morning and shortening the night length. Using the artificial light program, mares can be in oestrus and fertilize earlier in the breeding season, therefore breeders can breed larger, stronger two-years-old foals with a greater chance to win a competition in the horse racing industry. The authors summarize the physiological background of the applied artificial light program.
References
Allen, W. R. (1985). Practical control of anestrus in thoroughbred broodmares. In: Ellendorf, F. – Elsaesser, F. (eds.): Endocrine causes of seasonal and lactational anestrus in farm animals. Martinus Nijhoff Publishing, Boston Hardbound, 248. https://doi.org/10.1007/978-94-009-5026-9_12
Becze, J. (1981). A nőivarú állatok szaporodásbiológiája. Mezőgazdasági Kiadó, Budapest, 394.
Bodó I., Hecker W. (1992). Lótenyésztők kézikönyve. Mezőgazda Kiadó, Budapest, 429.
Bour, B., Palmer, E., Driancourt, M. E. (1985). Stimulation of ovarian activity in the pony mare during winter anoestrus. In: Ellendorf, F. – Elsaesser, F. (eds.): Endocrine causes of seasonal and lactational anestrus in farm animals. Martinus Nijhoff Publishing, Boston Hardbound, 248. https://doi.org/10.1007/978-94-009-5026-9_11
Burkhardt, J. (1947). Transition from anestrus in the mare and the effects of artificial lighting. J. Agric. Sci., 37, 64–68. https://doi.org/10.1017/S0021859600013083
Cseh S. (1973). Állatorvosi szaporodásbiológia és szülészet. Mezőgazdasági Kiadó. Budapest, 957.
Fitzgerald, B. P., Affleck, K. I., Barrows, S. P., Murdoch, W. L., Barker, K. B., Loy, R. G. (1987). J. Reprod. Fert., 79(2), 485. https://doi.org/10.1530/jrf.0.0790485
Giffen, J. M. D., Gore, T. D. V. M. (1989). Horse Owner’s veterinary handbook. Howell Book House, New York Company, New York. 480.
Ginther O. J. (1992). Reproductive Biology of the Mare: Basic and Applied Aspects. 2nd Edition. Equiservices, Cross Plains, Wisconsin, 189–190.
Ginther, O. J. (1979). Reproductive biology of the mare: basic and applied aspects. McNaughton Gunn Inc. Ed., Antlerbor, Michigan. Chapter 5, Sections 5a and 5e.
Grubauch, W. R., Sharp, D. C., Berglund, L. A., McDowell, K. J., Kilmer, D. M., Peck, L. S., Seamans, K. W. (1982). Effects of pinealectomy in pony mares. J. Reprod. Fertil., Suppl. 32. 293–295.
Guillaume, D., Duchamp, G., Nagy P., Palmer, E. (1998). Approach of the minimum lighting conditions to photostimulate mares in winter inactivity. 7th International Symposium on Equine Reproduction, University of Pretoria, South Africa. Abst., 51–52.
Guillaume, D., Palmer, E. (1991). Effect of oral melatonin on the date of tehe first ovulation after ovarian inactivity in mares under artificial photoperiod. J. Reprod: Fertil., Suppl. 44. 249–257.
Husvéth F. (2000). A gazdasági állatok élettana az anatómia alapjaival. Mezőgazda Kiadó, Budapest, 653.
Huszenicza Gy. (1993). A kanca nemi működése és szaporodási zavarai. In: Haraszti – Zöldág (szerk.): A háziállatok szülészete és szaporodásbiológiája. Mezőgazda Kiadó, Budapest, 454–480., 821.
Huszenicza Gy. és mtsai. (1989). Mesterséges fénykiegészítéssel és gesztagén kezeléssel végzett ciklusindukció anoestrusos kancákon a téli – tavasz eleji időszakban. Magyar Állatorvosok Lapja, 4. 211–216.
Jobbik Á. (1992). Aktuális szaporodásbiológiai kérdések a lótenyésztésben. Diplomadolgozat. PATE, Georgikon Mezőgazdaságtudományi Kar, Keszthely, 10–12.
Kooistra, L. H., Ginther, O. J. (1975). Effect of photoperiod on reproductive activity and hair in mares. Am. J. Vet: Res., 36. 1413–1419. https://doi.org/10.2460/ajvr.1975.36.10.1413
Malpaux, B., Robinson, J. E., Scanes, C. G. (1988). Importance of changing photoperiod and melatonin secretory pattern in determining the length of breeding season in the Suffolk ewe. J. Reprod. Fertil., 83(1), 461–470. https://doi.org/10.1530/jrf.0.0830461
Palmer, E., Driancourt, M. A. (1983). Some interactions of season of foaling, photoperiod and ovarian activity in the equine. Livestock Production Science, 10(2), 197–210. https://doi.org/10.1016/0301-6226(83)90035-0
Palmer, E. (1979). Reproductive management of mares without detection of oestrus. J. Reprod. Fert. Suppl., 27. 263.
Pelletier, J. Almeida, G. (1987). Short light cycles induce persistent reproductive activity in Ile-de-France rams. J. Reprod Fert., (Suppl.), 34. 215–226.
Scraba, S. T., Ginther, O. J. (1985). Effects of lighting programs on onset of the ovulatory season in mares. Theriogenology, 24(6), 667–679. https://doi.org/10.1016/0093-691X(85)90165-7
Sharp, D. C., Vernon, M. W., Zavy, M. T. (1980). Alterations of seasonal reproductive patterns in mares following superior cervical ganglionectomy. J. Anim. Sci., 51(Suppl. 1), 534.
Silvia, P. J., Squires, E. L., Nett, T. M. (1987). Pituitary responsiveness of mares challenged with GnRH at various stages of the transition into the breeding season. Journal of Animal Science, 64(3), 790–796. https://doi.org/10.2527/jas1987.643790x
Szenci, O. (1984). A háziállatok szaporodása és mesterséges termékenyítése. Mezőgazdasági Kiadó, Budapest, 288.
Thompson, P. L., Godke, R. A., Nett, T. M. (1983). Effects of melatonin and thyrotropin releasing hormone on mares during the nonbreeding season. J. Anim. Sci., 56(3), 668–677. https://doi.org/10.2527/jas1983.563668x
Török L. (1987). A ló. In: Becze József (szerk.): Kérdések és válaszok a szaporodásbiológia gyakorlatából. Mezőgazdasági Kiadó, Budapest, 85–112., 302.
Wright, B. (1998). Artificial lighting for mares, OMAF, Fergus
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