No abstract

Yarrowia lipolytica yeast can be a valuable component of feed compounds due to its high content of protein and essential amino acids, as well as minerals. the objective of the study was to verify the research hypothesis that Yarrowia lipolytica (yl) yeast, having a more valuable chemical composition than Saccharomyces cerevisiae (sc), can improve growth performance in piglets. an attempt was made to determine what proportion of yl yeast in a compound feed for piglets would produce measurable effects in terms of production and health. the experiment was carried out on 46-dayold piglets receiving experimental mixtures for 39 days. the piglets in the experimental groups were fed the same mixture as the control, but with 3% or 6% fodder yeast of the strain Yarrowia lipolytica a-101 in place of soybean meal. The YL fodder yeast had significantly higher content of alanine (by about 50%), lysine, isoleucine and tryptophan (over 30%), leucine, valine, glycine and glutamic acid (over 20%), and tyrosine (by about 17%) in comparison with sc yeast. content of crude fat was three times higher than in SC yeast. YL yeast had significantly higher content of Na + , K + , ca +2 , mn +2 , s, mg +2 and Zn +2 than SC, as well as significantly higher content of vitamins B 2 and e. Yarrowia lipolytica fodder yeast introduced to compound feed in the amount of just 3% improved growth performance (an increase in daily weight gain and a decrease in feed conversion per kg weight gain). these results indicate that yl in the amount of 3% in compound feed can be successfully used in the diet of piglets in place of the commonly used sc.

The objective of the study was to compare the efficiency of dietary supplementation of two species of yeast, Yarrowia lipolytica (YL) and Saccharomyces cerevisiae (SC), with or without the addition of a probiotic, on growth performance, basic nutrients digestibility and blood profile in piglets. The experiment was conducted on 360 weaned piglets (180 barrows and 180 gilts). Each treatment comprised 60 piglets. The piglets (27-day-old) were assigned to the following dietary treatments: (a) basal control (C) diet, (b) C diet + probiotic (Bacillus licheniformis and Bacillus subtilis-2 × 10 CFU/kg of feed), (c) C diet + 3% Y. lipolytica (YL-2 × 10 CFU/g), (d) C diet + 3%YL + probiotic, (e) C diet + 3% S. cerevisiae (SC-3 × 10 CFU/g) and (f) C diet + 3% SC + probiotic. Blood for analysis was collected from a total of 36 piglets at the end of the experiment, that is, 56 days after weaning. During the entire experiment, significantly greater weight gain was observed in the piglets receiving YL. The addition of the probiotic supplement and SC yeast reduced the daily feed intake during day 16-56 and from day 0 to 56 of the experiment. A better feed conversion ratio (FCR) during day 0-56 of the experiment was noted after addition of the probiotic and yeast. The use of YL yeast in diets for piglets had a more beneficial effect on weight gain and FCR than SC. Moreover, the addition of YL modulates lipid metabolism in piglets, as indicated by the reduced levels of TCH, LDL and TG and increased level of HDL in the plasma. The combined use of either YL or SC with a probiotic is not recommended in piglet rearing, as it does not substantially improve growth performance and health in comparison with yeast alone.