Page 264 - Primary Six Notes

Cross breeding: This is the mating of unrelated breeds of ani-

mals like an exotic bull mating a local cow.

Line breeding: This is the mating of animals such as cousins.

Upgrading: This is the improving the existing breed by mating

with a superior quality of breed several times. (at different

generations)

Reasons why farmers cross breed

 To improve the quality of local breed

 To increase on the milk or meat production

 To improve on resistance to diseases

 To improve on the rate of growth

 To adopt to difficult conditions

Reproduction

This is the process by which living organisms produce other

living organisms which resembles them.

Service / insemination

This is the act of depositing semen into the female reproduc-

tive organs

Types of service/insemination

Natural insemination.

This is where a bull deposit semen into the vagina of a cow

Advantages of natural insemination

 It is cheap

 It is easy for a bull to identify a cow on heat