for beef and mutton increasing of animals?
Enzymes like xylanase and cellulase
The results have been inconsistent at this time. Enzyme addition appears to be more efficacious in barley and forage based diets.
MicroCell & ProTerpative SFhttp://www.lallemandanimalnutrition.com/products/micro-cell-gold/
BIozime has several dead yeast and other products http://biozymeinc.com/
Alltech has Amaize and YeaSacc : http://www.alltech.com/
Diamond V has a yeast product as well called XP http://www.diamondv.com/
Biosaf made by Saf Agri http://saf-agri.com/