Question

Why is animal rearing restricted to the western part of the prairies

Answer 1

prairies are grass parks in southern america.
Animals are reared in the prairies in huge farms. These farms are completely mechanized. Animals like cattle, pigs and poultry are reared for milk or meat. The entire process of obtaining milk from cows or slaughtering the animals for milk is carried out machines with minimal human participation. The number of animals reared in a particular firm is also very big.

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Answer 2

The animals rearing are restricted to the western part of the prairies because that area is essentially grassland where animals can feed themselves by eating the grass.

It is not used for farming as that land is too dry and any plantation done on it would not thrive due to the lack of moisture in the soil.