Speaking of the artwork. To the right of the chicken is what looks like a horse. Or is it a dog? Maybe it's meant to be a cow? No mention of horse meat in the article, although they do mention beef.
I think I answered my own question with a few google searches. Seems that Romans had a taboo about eating hoursemeat. https://www.academia.edu/12021679/1999_Eating_horse_meat_the...
So I guess that picture is suppose to be a cow?