Показатели содержимого рубца и здоровья дойных коров при скармливании им силоса, приготовленного с добавкой молочнокислых и пропионовокислых бактерий

The experiment was carried out at the Institute Animal Science to determine the influence of different silages on rumen fermentation parameters of dairy cows. The silages were made from a first cut wilted legume-grass (64% - red clover, 12% - timothy, 16% - fescue and 8% - others) sward. The use of biological additive L. rhamnosus and Propionibacterium freudenreichii ssp. Shermanii in ensiling prewilted material, rich in red clover, improved fermantation and silage quality, what resulted in rumen fermentation changes in dairy cows. Ten dairy cows assigned in two groups on the basis of milk yield and month of lactation were offered silages without inoculant (C) and with inoculand (I) ad libitum during a period of 100 days. There were no significant effects of the type of silage on pH in the rumen (6.44 vs 6.57 for C silage and I silage), on the total volatile fatty acid concentration (10.74 vs 10.50 mmol 100 ml-¹) and on these proportions (57.87 vs 57.89 for acetic acid, 22.30 vs 22.45 for propionic acid, 14.28 vs 14.54 for butyric acid). The infuzoria count in the rumen of dairy cows fed inoculated silage was by 44.29 (P<0.05) thous. ml-¹ higher compared with that of cows fed silage without inoculant. Feeding silage with inoculant was beneficial to rumen protein synthesis, i.e. the content of protein nitrogen and that of total nitrogen were, respectively, by 3.3 and 5.73 mg 100 ml-¹ higher and the content of ammonia nitrogen was by 1.77 mg 100 ml-¹ (P