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Tokom četiri proizvodne godine (2011-2014), analizirani su reproduktivni pokazatelji iz 123 laktacije 46 umatičenih grla i to 79 laktacija od 30 krava holštajnske rase i 44 laktacija od 16 krava simentalske rase, na dva porodična gazdinstva. Krave su hranjene uz dodatak različitih količina vitaminskih silaža COMBO-VIT-SIL®. Silaže su na bazi šargarepe, tri vrste bundeve i cele biljke kukuruza, svežeg repinog rezanca ili klipa kukuruza. Prva proizvodna godina, 2011. godina, uzeta je kao kontrolna, jer tada nije korišćena vitaminska silaža u ishrani krava. Najveći sadržaj β-karotina utvrđen je u silaži šargarepe i muskatne bundeve: 391,65 mg/kg suve materije. Upotrebom vitaminskih silaža u našem ogledu, postignut je porast prosečnog prinosa mleka, na farmi holštajnske rase, za 1,101 kg , a na farmi simentalske rase za 29 kg, (p>0,05). Prosečan indeks VO smanjen je kod krava holštajnske rase od oko 3,38 doza, na 2,42±1,80 doza, a kod krava simentalske rase od 1,60±1,35 na 1,40±1,26 doza. Servis period je na farmi krava holštajnske rase bio značajno kraći uz silaže sa vitaminskom bundevom (p<0,01), u odnosu na kontrolnu grupu, a na farmi krava simentalske rase, uz dodatak silaže sa muskatnom bundevom, u odnosu na dodatak silaže sa šargarepom (p<0,05). Uz pomenuto, značajno je skraćen i normalizovan međutelidbeni interval, kod krava holštajnske rase od 427±74 dana, na 372±17 dana, a kod krava simentalske rase od 480±124 dana, na 364±38 dana., During four consecutive productive years (2011-2014) reproductive parameters of 123 lactations from 46 cows on two family farms were monitored and analyzed (79 lactations in 30 Holstein and 44 lactations in 16 cows of Simmental breed). Cows were fed with the addition of different amount of vitamin silages COMBO-VIT-SIL®. Silages were produced from, carrot, three different types of pumpkins, whole corn, sugar beet pulp or corn cob with grain. The #irst production year (2011) was taken as a control; animals were fed corn silage during that year. The highest amount of β-carotene was determined in the silage of carrot and Muscat pumpkin (391.65 mg/kg of DM). By the use of vitamin silages in our study average milk yield was higher for 1.101 kg in Holstein and for 29 kg (p>0.05). Average days until #irst arti#icial insemination was shorter for vitamin silages (p<0.01), as well as for silages with Muscat pumpkin ad as well as for the carrot silage (p<0.05). Average insemination index in Holstein supplemented with vitamin silage was lower (2.42±1.80 doses compared to the control 3.38); similarly it was lower in Simmental cows fed vitamin silages 1.40±1.26 versus 1.6±1.35 doses in control. Beside mentioned, intercalving interval was shortened in both Holstein (from 427±74 on 372±17 days) and Simmental cows (from 480±124 on 364±38 days).