In principle, it should be noted that the use of one type of food alone cannot meet all the needs of the animal, because on the one hand, the volume of the animal's rumen and digestive system is limited, and on the other hand, the animal's body needs a set of food. This set of food items is called food ration, which should be prepared and adjusted according to the maintenance needs, the production needs of the animal and the type of food and considering its financial aspects.

It should be noted that some food items for a certain category From animals it can be a complete food, if it is not so for another group. For example, milk is a perfect food for an infant calf, but after a certain age, this food alone cannot meet all the needs of the animal, so the ewes need more food during pregnancy. Improper and insufficient food has adverse effects on ewes and lambs, because the nutritional needs of the fetus are provided by the mother's food, and the lack of food, especially at the end of the pregnancy period, causes the production of thin and weak lambs, and the right food causes the rapid growth of lambs or calves. to be Also, in fattening, animals need dense and nutritious foods so that their extra weight is economical.

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