Na jednoj farmi muznih krava HF pasmine obavljeno je istraživanje učinaka jedne aplikacije analoga PGF₂alfa. Pokus je uključio grupu od 66 krava te skupinu od 39 junica kod kojih je neposredno nakon utvrđivanja žutog tijela na jajnicima obavljena intramuskularna aplikacija analoga PGF₂alfa. Pritom su primijenjena dva preparata "Gonid" (Pliva) i "Cloprosin-G" (Krka). Obje skupine životinja tretirane su s oba preparata u približno jednakim omjerima. Upotrebljene su doze koje su prema uputi proizvođača dostatne za izazivanje luteolize i estrusa. Doza za Gonid bila je 2 ml odnosno 500 mikro g kloprostenola u obliku natrijeve soli, a za Cloprosin-G, 2ml ili 800 mikro g sintetskog analoga PGF₂alfa. Rezultati ovog istraživanja pokazuju da se estrus očitovao kod 59 krava (89,39%)i 36 junica (92,30%). Umjetno su osjemenjene 53 krave i 34 junice, dok kod šest krava i dviju junica osjemenjivanje nije obavljeno zbog nedostatka nekog od znakova estrusa. Nakon jednog osjemenjivanja koncipirala je 21 krava, a to je39,62% od ukupno osjemenjenih krava, te 20 junica što čini 58,82% od ukupno osjemenjenih junica. Prosječno vrijeme koje je proteklo od aplikacije analoga PGF₂alfa do očitavanja estrusa bilo je kod krava 2,4 dana, a kod junica 2,5 dana.The effect of one treatment with Prostaglandin F₂alfa analog (Gonid-PLIVA, and Cloprosin-G, KRKA) was investigated on a farm of dairy cows. In the experiment 66 cows and 39 heifers mine the presence of a corpus luteum, and than all cows and heifers with C. L. were treated with one of the sinthetic analogs of PGF₂alfa intramuscularly. Both groups of animals were treated with the same amount of the same analog of PGF₂alfa (Gonid of Cloprosin). The dose of Gonid was 500 microg of cloprostenol, and that of Cloprosin was 800 micro g of sintetic analog of PGF₂alfa. The volume of the dosse was 2 ml. The results of estrus induction were very good because the sings of heat were registered in 59 (89,39%) cows and 36 (92,30%) heifers. The time from the aplication of PGF₂alfa analog to the start of the sings of heat was on average in cows 2,4 days, and in heifers 2,5 days. Insemination was performed in 53 cows and 34 heifers. Only six cows and 2 heifers were not inseminated because there were no signs of estrus. After the first insemination 21 cows were pregnant (39,62%) and 20 heffers (58,82%
