Physiological Levels of Oestradiol and Progesterone during Breeding Farm Animals

Fiziološke razine spolnih hormona estradiola i progesterona variraju s obzirom na vrstu farmskih životinja, njihov pasminski sastav, spol, dob te hranidbu i nacin držanja, regulirajuci pritom njihovu spolnu zrelost i reproduktivnu funkciju. Uzimajuci u obzir sve navedene cimbenike, teško je sa sigurnošcu odrediti standardne fiziološke vrijednosti ovih 39 spolnih hormona kod razlicitih vrsta farmskih životinja. S obzirom da se spolni hormoni mogu koristiti u terapeutske svrhe u cilju lijecenja bolesti reproduktivnog sustava, ali i biti zlouporabljeni kao pospješivaci rasta u cilju ostvarivanja povecanih prinosa u stocarskoj industriji, nužno je potrebno poznavanje referentnih vrijednosti odnosno njihovih fizioloških razina. Cilj ovog rada je, uzimajuci u obzir navedene cimbenike utjecaja, istražiti fiziološke razine prirodnih hormona estradiola i progesterona u krvi razlicitih vrsta farmskih životinja koje se uzgajaju u svrhu proizvodnje hrane životinjskog podrijetla.Physiological levels of sex hormones oestradiol and progesterone vary according to the type of farm animals, their racial composition, sex, age, and feeding and the gait, thereby regulating the their sexual maturity and reproductive function. Considering all these factors, it 40 is difficult to determine with certainty the standard physiological values of these sex hormones in different species of farm animals. With regard to sex hormones may be used for therapeutic purposes in order to cure diseases of the reproductive system, or they can be the object of fraudulent use of growth promoters in order to achieve increased yields in the livestock industry, the knowledge of their reference values or physiological level is necessary. The aim of this paper is, taking into account these factors of influence, to investigate the physiological levels of natural hormones oestradiol and progesterone in the blood of different species of farm animals bred for the production of food of animal origin