Here is the table for cows:
Animal Level / %Rank Up / %Color Change / %Failure / Exp Incr if Fail / Levels with Same Outcome
333 / 24 / 7 / 69 / 1
433 / 29 / 7 / 64 / 1 / 444
533 / 34 / 7 / 59 / 2 / 544,553
555 / 41 / 7 / 52 / 2 / 554
633 / 39 / 7 / 54 / 3 / 644,653,654
655 / 46 / 7 / 47 / 3 / 663,666
733 / 44 / 7 / 49 / 3 / 743,754
755 / 51 / 7 / 42 / 4 / 774,776
777 / 58 / 7 / 35 / 4
833 / 49 / 7 / 44 / 4 / 843,853
855 / 56 / 7 / 37 / 5 / 866,875,883,885
877 / 63 / 7 / 30 / 5 / 876,886,887
933 / 54 / 7 / 39 / 5 / 953
955 / 61 / 7 / 32 / 6 / 966,973,983,984,993
977 / 68 / 7 / 25 / 6 / 976,988,995,998
999 / 75 / 7 / 18 / 6
X33 / 59 / 7 / 34 / 0 / X44
X55 / 66 / 7 / 27 / 0 / X83
X77 / 73 / 7 / 20 / 0 / X88,X95,X97,XX3,XX7
X99 / 80 / 7 / 13 / 0 / XX8,XX9
XXX / 87 / 7 / 6 / 0
Adding items increases alt color chances by 11%, so if you use one level 10 cow and two level 9s w/item bonus, you would only have a 2% chance of total failure.
It is hard to argue efficiency with these when going for rank 3 animals, because if you fail a lot at getting the rank 2 animals, you won't want to attempt a rank 3 with low-level animals!
From
here.