DOI: 10.32900/2312-8402-2022-128-4-20
Keywords: growing rabbits, Saccharomyces cerevisiae, fattening performance, meta-analysis
Abstract
A study was conducted to determine the effect of Saccharomyces cerevisiae supplementation in the diet of growing rabbits on their mortality, fattening performance and feed conversion rates.
In a pooled analysis, supplementation of Saccharomyces cerevisiae to the diet of growing rabbits caused a significant increase in final weight by 132.24 g (non-standardized average difference). According to the obtained data, there is a systematic error associated with publication bias (Egger’s test, p =<0.001) and high heterogeneity between studies (I2 = 92.9 %, p<0.001). The results of the Q-test (χ2=282.733) and its p-level (<0.001) indicate the occurrence of statistically significant heterogeneity and the null hypothesis which states that all studies share a common effect size was rejected. The effect of Saccharomyces cerevisiae administration was not characterized by statistically significant variation in the genetic subgroups of rabbits (test for subgroup differences: p=0.759). In parallel there was a statistically significant variation in subgroups of SC dose (test for subgroup differences: p=0.04). When a higher concentration of Saccharomyces cerevisiae was used, the average final weight in the experimental group was 209.23 g higher than the final weight in the control group. When a lower concentration of SC was used, the average final weight in experiment was more than the control by 93.38 g.
In own researches Saccharomyces cerevisiae (MUGL 39885, 0.01% – 15 billion cell per gram) was added to the feed for the experimental group before granulation. After 37 days of fattening, the control group reached an average weight of 2230 g, whereas the weight for the experimental group was 2608 g, probably due to the better FCR in the experimental group. Both mentioned differences were significant. Whereas the daily feed intake did not differ in the studied groups. Comparison of the rabbit survival in each group showed no significant difference for the one-sided t-criterion (p=0.097).
Therefore, the usage of feed with Saccharomyces cerevisiae additive affects the results conceding rabbits fattening. Experimental group obtained the statistically significant best average final weight, daily gain and feed conversion ratio in the same raising conditions. It confirms the results obtained from the meta-analysis. At the same time, there is no statistically proven change in feed intake between groups, and that is a promising and important economic and ecological result.
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