If evolution is to be seen as a species's ability to transmit genes and continue to propagate then among mammals Humans happens to be one of the most successful animals, or at least this is how the species perceives it since the time Darwin. The second best performers in this definition happens to be those who has some purpose to serve to the species of Homo sapiens sapiens. Therefore, cow, chicken, pigs are evolutionarily more successful than their wild varieties or the rest of the animals which lack purposive connection to humans.
Frankly, the whole idea of evolution under this definition is now worthless. Kaleidoscope knows he might receive a heavy blow from his friends from biological disciplines because come on evolution cannot be flawed! He knows the luxurious life that he leads is a fruit of evolution and he also knows even poorest of the poor of this world is leading a luxurious life if it is compared to the Homo erects - and credit goes to evolution. However, as it is said "idea of evolution is flawed" it also demands some explanation. Evolution in terms of passing on genes to the next generation to continue the species happens to be the primordial drive and also the source of most of the problems in the world! - well this is not the reason for which evolution is flawed! Evolution as a concept of passing genes is flawed because it lacks subjective dimensions - the dimension that has never looked upon seriously. The basic question that needs some reflection is something like this "Do I need this life to pass on genes?" Any reader might say - well its like Cartesian ideology. Some other might say "okay, that is only true for Homo sapiens sapiens and not for the rest of the animals, because they are yet to reach the cognitive revolution. Kaleidoscope will say its not so and will refer to an old post on Civilisation and Question of Love series "Brutality on animals".
Think about hens having complex world of behavioural needs and drives. They want to run around, find hierarchy, make nest lay eggs and groom. Think about intelligent and inquisitive pigs. Think about dairy cows. These animals spend almost their entire allotted life inside a confined space. Calves, piglets are kept away from their mothers. all of them are fed with perfect dose, given hormone injections and so on an so forth. Just to pass on their genes for the superior species Homo sapiens (Benson and Rollins 2004, Appleby Mench Hughs 2005). Yes, Kaleidoscope knows it might seem a laughable logic. Okay, fine, lets go back to the age of slavery. Or assume the role of any minority population in today's world. Even better think about your life in front of a computer screen for 12 - 15 hours a day for 12 months a year and then think about the significance of evolution on Homo sapiens sapiens. You can pass on your genes only to be exploited by others.
Pic courtesy: https://www.pinterest.com/explore/evolution-cartoon/