Tywasin, is also known as Super Tylosin,Acetylisovaleryltylosin Tartrate or Tylvalosin Tartrate, is a new generation of macrolide antibiotics to protect and cure animals respiratory and digestive disease, it is favorite by food-producing animal producer due to its unique advantages of excellent mycoplasma antibiotics against ability and three days withdrawal period. Hubei Yasen Biotechnology Co.,Ltd, as a high & new technical enterprise of China, focuses on the R&D and producing of microecologics and antibiotic fermentation, is one of the largest manufacture of tylvalosin tartrate in the worldwide, in addition, is the first company owns Tywasin patent (Patent No. ZL 201010565652.1)in China.