China 
[Pacesetter 5000] Top academic papers in Chinese fine science and technology journals | Experimental study on the effects of yeast culture on growth performance, slaughter performance and meat quality of fattening cattle was selected
Conclusion
When yeast culture was added to the basal diet (150 g/day/head), daily gain was increased by 10.9%, feed to gain was decreased by 9.7%, muscle marbling grade was increased by 11%, dripping loss and cooking loss were decreased by 5.7% and 16.2%, respectively, and there was no significant effect on fatty acid and amino acid composition of longissimus dorsalis muscle.
https://shipin.enhalor.com/lw/7FC.pdf
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