(a) (i) Definition of culling as used in cattle production;
Culling is the removal of animals from the flock for specific reasons

(ii) Reasons for culling;

For immediate financial gain
To avoid the spread of diseases
To prevent animals with undesirable trait from reproducing
To remove unproductive animals
To reduce competition for feed
To reduce competition for space
To reduce competition for water



(b) Major function of ptyalin, renin and pepsin during digestion of feed in rabbit

Ptyalin: It is an amylase/enzyme which converts/digests starch to maltose/dextrin in the mouth

Renin: It is an enzyme which helps in the coagulation/curdle of milk protein in the stomach
OR
Digestion of casein to casinogen in the stomach

Pepsin: It is an enzyme which converts proteins to peptones and or polypeptides in the stomach