Saccharomyces cerevisiae, urea y melaza como aditivos zootécnicos en la ración alimenticia y calidad de leche de vacas holstein.

Abstract

The objective of this study was to evaluate the effect of Saccharomyces cerevisiae, urea, and molasses as zootechnical additives in the feed ration of cows; for this purpose, 21 Holstein cows and their crossbreeds, in lactation period between 2 to 6 months, with 3 to 5 calvings, were evaluated and assigned to three treatments: T0 (Control), T1(Saccharomyces cerevisiae 30gr/cow/day + urea 3Kg/ton of feed + molasses 30ml/cow/day) and T2 (Saccharomyces cerevisiae 50gr/cow/day + urea 5Kg/ton of feed + molasses 50ml/cow/day). A Flushing program was given to all experimental units to homogenize body condition, considering a 21-day adaptation period to the diet. The variables studied were milk production/cow/day, total solids content (fat, protein, lactose, and minerals), ruminal pH, VFA production (acetic, propionic, and butyric), and somatic cell count. The results showed that the T2 treatment was able to increase the amount of milk produced and the percentage of fat and protein in the milk, reaching a production of 13.95 Ltrs/cow/day; 3% of protein and 3.21% of the fat present in the milk; while ruminal pH, VFA production and somatic cell count did not register significant difference (p>0.05) between treatments. It is concluded that the addition of Saccharomyces cerevisiae 50 g/cow/day + urea 5 kg/ton of feed + molasses 50 ml/cow/day in the ratio of dairy cows has a positive impact on milk production and the amount of fat and protein present in the milk.

Keywords: saccharomyces cerevisiae, total solids, milk production, rumen kinetics