The production of new varieties of animals which are superior to their parents through selective breeding or mating is called animal breeding. 

There are two control breeding methods 

1. Artificial insemination 

2. Multiple ovulation embryo transfer technology (MOET) 

Artificial insemination 

Semen of superior male is collected and-injected unto the reproductive tract of selected female. 

Significance: 

1. It helps to overcome several problems of normal mating. 

2. Semen of a desirable bull can be inseminated into cows. 

3. Semen can be stored by cryopreservation to use at later stages and can be easily transported to distant places. 

4. Semen of single ejaculation can be used to inseminate large number of cows.

Multiple Ovulatuion Embryo transfer technology (MOET) Technique for herd improvement by successful production of hybrids 

1. Hormones (FSH) are administered to the cow for inducing follicular maturation and super ovulation. 

2. Cow produces 6-8 eggs instead of one egg and is either mated with, superior bull or artificially inseminated. 

3. Fertilized egg at 8-32 cell stage are recovered non-surgically & transferred to surrogate mother. 

Significance: 

1. It is practiced in cattle, sheep, rabbits, buffaloes, etc. 

2. Genetically superior animals can be produced. 

3. It solves the problems of infertility. 

4. A single female can donate many ovules. 

5. Preservation and transport of embryos is convenient.