$(a)$ What is lactation period? Name two breeds of cattle which are selected for their long lactation period. Why are they crossed with local breeds?
$(b)$ What are roughage and concentrates?
$(b)$ What are roughage and concentrates?
(N/A) The lactation period is the duration of milk production by a female mammal after the birth of a calf.
Two breeds of cattle selected for their long lactation period are $Jersey$ and $Brown$ $Swiss$.
They are crossed with local breeds because local breeds possess excellent resistance to diseases and environmental stress,while the foreign breeds provide high milk yield. Cross-breeding combines these desirable traits into the offspring.
$(b)$ Roughage: It is a type of animal feed that is largely fibrous and contains a high percentage of cellulose. It provides bulk to the diet.
Concentrates: These are animal feeds that are low in fiber but contain relatively high levels of proteins,carbohydrates,fats,and other essential nutrients to support high productivity.
Two breeds of cattle selected for their long lactation period are $Jersey$ and $Brown$ $Swiss$.
They are crossed with local breeds because local breeds possess excellent resistance to diseases and environmental stress,while the foreign breeds provide high milk yield. Cross-breeding combines these desirable traits into the offspring.
$(b)$ Roughage: It is a type of animal feed that is largely fibrous and contains a high percentage of cellulose. It provides bulk to the diet.
Concentrates: These are animal feeds that are low in fiber but contain relatively high levels of proteins,carbohydrates,fats,and other essential nutrients to support high productivity.
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