When it was apparent that urine pH, and not ash or magnesium was the problem, they began to add Ammonium Chloride to their cat foods to acidify the diet.

• 当越来越多的事实表明，这个问题的关键并非是灰分或镁，而是尿酸碱值，宠物食品制造商开始往生产的猫食中添加氯化铵以酸化食物。