Abstract: The present invention aims to provide a poultry diet that can soften the flesh quality of poultry meat and improve the texture, a method of producing a large amount of meat with improved texture by using the diet, and a breeding method of poultry having flesh quality with good texture, and a flesh quality softening agent for poultry to be used by addition to feed. Astaxanthin is contained in a diet to give a poultry diet for improving texture. The present invention can improve texture by decreasing the shear force of poultry meat by breeding the poultry on the diet.

Abstract: A method for increasing free glutamic acid content in meat of poultry or livestock, thereby improving the taste of the meat, and the feed used therefor are disclosed. In the method of the present invention, a feed having a low leucine content is given to the poultry or livestock.