“The Taurine Requirement of the Adult Cat”, I. H. Burger, K. C. Barnett1982-09 (; backlinks)⁠:

From the results of two earlier investigations [of cat taurine requirements] it appeared that the minimum daily taurine requirement was 35–56 mg for an adult cat.

The taurine requirement of adult cats was investigated using a purified amino-acid diet containing various levels of added taurine.

The results of the present study show that a taurine intake of about 10 mg/kg bodyweight/day is sufficient to maintain adult cats in adequate taurine status.

This value is in agreement with the previous estimate and approximates to a taurine concentration of 500 mg/kg of dry matter in a commercial cat food.

[This only measures the necessary taurine to avoid gross eye retinal pathology over a short period, not any kind of overall life-long optimum taurine consumption rate.]