Naslov
Temporary and permanent oestrus suppresion of mares

Autori
Prvanović Babić, Nikica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts "The 5th international congress veterinary science and profession" / Horvatek Tomić, Danijela ; Severin, Krešimir ; Slavica, Alen - Zagreb, 2013, 24-25

Skup
The 5th international congress veterinary science and profession

Mjesto i datum
Zagreb, Hrvatska, 03.10.2013. - 04.10.2013

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
mare; estrous supresion; sport horses; feral population

Sažetak
Owners of mares used in different sport disciplines (jumping, racing, trotters etc.) often seek veterinary advice considering estrus supression for their mares. Namely, competition season is ussually followed by cyclicity. Mares in heat often are moody, have difficulties to concentrate and fail to gain best possible results. Furthermore, when travelling to competitions there is allways possibility for unwanted mating and consequently pregnancy. More or less, situation is controversial. Mares need to gain good results to ensure better prices for their potential offsprings later. In the same time, reproductive traits and cyclicity could directly have negative influence on their performance as sport or racing animals. Furthermore, some of contraceptive agents routinely used for oestrus suppresion could have longterm negative effect on fertility and reproductive performance. Keeping in mind the fact that the same animals should become broodmares later in their lifes, it is essential to perform detail and precise approach when dealing with such situation. Estrus supression of mares could be achieved using chemical, immunological, mechanical and surgical methods. Some mares that are not suitable for oestrus suppression could be candidates for oestrus translocation (induction of oestrus earlier to avoid sendinfg mares in heat to competitions) or just contraception (blockage of conception or pregnancy termination). Some animals could benefit from NSAID therapy (with or without other mentioned methods) since some mares experience pain and/or discomfort during oestrus (caused by softening of muscles and ovulation) and sometimes is good enough to relieve the pain and animal is much more cooperative and easier to handle. However, method of choice depends of current sport and future reproductive destiny of the mare. Future fertility depends not only on mare's age but also on age at first cover or A.I. It is very important to educate mare owners and start with regular veterinary examinations of mare reproductive tract to keep her healthy and fertile. It is also crucial to inform mare owners about risks of subfertility or/and infertility of mares that are introduced to breeding too late i.e. in teenager years since its reproductive effiviciency decreases rapidly after 15.-th year of life. There is allways an option to use some of methods of assisted reproduction like embryotransfer (used routinely in valuable polo mares whose foals are delivered by recipient mares since donors are used in sports) or taking a year break for pregnancy, parturition and nursing during competition career of mare who will physically and psyhologically benefit of it. Furthermore, although there is no scientific data about influence of stress caused by intensive trainig, competitions and transport it is clear that such influence simply couldn't be good and positive since it is in strong opposition to natural insticts and lifespan of breeding mare. Keeping in mind all numbered facts it is easy to see how important is to have empathic, good informed and sensitive approach when prescribing contraceptive agents to different categories of sport and working mares. Contraception tehniques used for oestrus suppression is not limited only for sport and leisure animals. Oestrus suppression and/or pregnancy termination is up to date tehnology for population control of semiferal horses. Although there are still more traditional ways in usage such as sending overpopulated and unwanted horses to slaughterhouse or shooting of excessive animals, there is increased need to introduce new, modern and more humane methods such as nonsurgical castration i.e. vaccination against different factors involved in fertility, application of intrauterine devices to prevent pregnancy development and ovariotomy. All numbered methods have adventages and disadventages and method of chioce strictly depends on value, accesssability and usage of particular mare.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

POVEZANOST RADA