Q29 of 465 Page 54

What would happen if poultry birds are larger in size and have no summer adaptation capacity ?In order to get small sized poultry having summer adaptability, what methods will employed?

Larger sized birds require more feed. Summer adaptation is connected with egg laying. Little summer adaptation reduces egg laying. In order to get small sized poultry birds having summer adaptability, it is desirable to (i) Either introduce the required exotic birds from outside; and (ii) Cross bred the local birds with exotic birds from outside. Small sized poultry birds are preferred for (a) Lower requirement of feed; (b) Higher egg laying capacity; (c) Lower requirement for space.


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The figure shows two crop fields (plots A and B) have been treated by manures and chemical fertilizers, respectively, keeping other environmental factors same. Observe the graph and answer the following questions:


(i) Why does plot B shows sudden increase and then gradual decrease in yield?


(ii) Why is the highest peak in plot A graph slightly delayed?


(iii) What is the reason for the different pattern of the two graphs.