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i) Grading up
- The process of crossing until an animal having desirable characteristics is obtained.
- Example is mating Boran bull to Friesian cow to obtain increased production and disease resistance.
ii) Line breeding
- Is the mating of two individuals originating from one ancestor or same line of breeding.
iii) Cross breeding
Meaning:
- Mating two pure breeds belonging to different breeds/ mating a pure bred sire of one breed to a high quality grade female of another breed.
Reasons:
- To produce a hybrid with hybrid vigour
- Imparts desirable genes from either of the parents.
What is hybrid vigour?
- The increased ability and performance of the offspring above the average of the two unrelated parents.
iv) Outcrossing
- Mating two unrelated animals of the same breed
v) Inbreeding.
Meaning.
- Mating of closely related animals
Aim
- To retain/ preserve certain desirable qualities
Disadvantages
- Increases embryonic mortality/ abortion
- Reduces disease resistance ability
- Reduces the vigour of the animal / causes weakness/ abnormality
- Reduces yield.
Kavungya answered the question on March 28, 2019 at 08:20
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