You cannot compare raising crops with raising animals. They are two separate things, but the way animals are raised today is most likely cheaper than raising animals the way small farmers raise them. On a small farm, animals have fields they can graze, are not usually given any hormones, and the use of antibiotics is rare, but in what is called "factory farms" animals are raised in buildings under very crowded conditions. Many of these animals are given hormones or are genetically modified to grow faster, and are given antibiotics to ward of disease. It is likely that using the factory farm method is cheaper than allowing them room to graze and not using hormones to cause them to produce more or to grow faster.
Nitrogen is an essential nutrients that facilitate plant growth thus using the genetically modified bacteria can help much in plant production which in turn can support the ecological balance
raising animals
Depends on what animals you are raising, how many animals need to be fed, and what crops you are raising.
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yes
Rearing of animals, means raising animals. If you take in an abandoned baby squirrel, you will be rearing or raising the baby.
Farming and raising animals
Agriculture.
Domestication.
demestication
The business of growing crops and raising animals is farming. Farmers can choose to concentrate on either crops, or animals, or they have the option of doing both.
Farm,plants, and ranching,animals, are to agricultural occupations.