[Investigation on the state of fertility of cows in different farms].
D000818:Animals; D002417:Cattle / Q000502:physiology*; D002418:Cattle Diseases / Q000209:etiology; D005260:Female; D005298:Fertility; D007247:Infertility, Female / Q000209:etiology / Q000662:veterinary; D011044:Poland; D011247:Pregnancy
Badania nad stanem płodności krów w gospodarstwach indywidualnych