source: They are castrated so that the animal may be more docile or may put on weight more quickly.
target: The animals are castrated so they become more calm and put on weight.
references: The animals are castrated so they become more calm and put on weight. The animal is made less wild and gain weight by castrating him. The animals are castrated so they can be more tame gain weight faster. The animals are castrated to be more docile or put on weight quicker. They are castrated to make the animal more obedient or gain weight quickly. Animals are castrated to become more docile and so they can gain weight easier. They are castrated.  In this way, the animal becames tamer or may gain weight faster. Animals genitallia are removed to increase weight faster or to increase learning. They are castrated so that the animal may be more docile.  They also may put on weight more quickly. They are castrated so that the animal may be lazier or may gain weight.