Manasara 62.28

62.28

sārdhavahnyaṅgulaṃ jānuvistāraṃ parikīrtitam
khurāyāmaṃ dvimātraṃ syātpucchamūlaṃ dvimātrakam

Three and a half digits is declared to be the width of the knee; / the length of the hoof should be two digits; the root of the tail is two digits;