In the first chapter of Animal Farm, Mr. Jones is portrayed in a very negative light. He is depicted as a drunk who is more interested in alcohol than tending to his farm. He is so drunk in the first paragraph that he forgets to shut the "pop-holes" when he is putting the hens away for the night.
In addition, Mr. Jones is also portrayed as a greedy, money-oriented man. In his speech, for example, Old Major talks about all of the animals who have gone to market to bring in money for Mr. Jones. Similarly, Old Major also refers to the "knackers," a place where animals like Boxer are sent when they are too old to work. Again, the purpose of the knackers is to create profit for Mr. Jones.
Finally, Jones is portrayed as cruel and ruthless. Old Major says that he drowns older dogs in the pond and, in the final paragraph of this chapter, Jones breaks up this important meeting by firing his gun in the darkness.
These portrayals are significant because they act as an inspiration for the impending rebellion.