Cows and beef ( Alien takeover)

History
cows went extinct in the early 21st century as a result of the factory farming industry  and the popularity of  beef. It was popular among Silurians who woke up from the cryogenic chambers early in 2003. When the earth was re-colonized by the Silurians  they were disappointed that this delicious source of meat no longer existed. They tried to find remaining samples of the DNA of cows to bring them back however the DNA samples were horribly mutated and nonviable due to radiation and unintended side effect of terraforming. They also included that the Earth's climate was no longer capable of supporting this source of livestock. Scientists are still working on reestablishing the source of meat and they may have more success after they may contact with the colonies in Alpha Centauri. If they successfully bring back cows  they were genetically modify them to be smaller and more sustainable. They hope to reestablish this species on Mercury. So hopefully one day people eat beef again on a new planet that is sustainable and free of the excesses of the 21st century and humanity.

The most popular Protein
insect protein because of the absence of beef is now the most popular source of meat on the planet secondary to the dwarf chicken  genetically modified species of chicken that was introduced by slurring scientists  in the 25th century. fish is also popular among the remaining humans. There's also a rumor that Silurians eat human flesh but this is racist propaganda perpetrated by the torchwood Republic and the sea devils Republic