This document summarizes several conventional methods for improving animal breeds, including inbreeding, outbreeding, outcrossing, crossbreeding, and interspecific hybridization. Inbreeding involves mating animals of the same breed to increase desirable genes and eliminate recessive genes, but can lead to inbreeding depression over time. Outbreeding mates unrelated animals of the same or different breeds to overcome inbreeding depression. Outcrossing specifically mates animals of the same breed with no common ancestors. Crossbreeding mates animals of different breeds to develop new superior breeds or improve local breeds. Interspecific hybridization mates different species to combine desirable traits, though the hybrid offspring are sterile.

1. Presentation
On
Conventional methods of animal improvement
BMB -402
• Submitted TO
•
• Rezuanul Haque
• Associate Professor
• Department of Biochemistry &
Molecular Biology,
• University of Chittagong.
• Submitted By
•
• Fatema Yasmin Nisha
• ID -16604002
• Department of Biochemistry
& Molecular Biology,
• University of Chittagong.

2. What is animal improvement?
A complex process that involves -
-controlled cultivation
-management
-production of domestic animals.
It includes the improvement of qualities considered
desirable by humans which is done by animal breeding
techniques and methods.

3. Production of improved breeds of domesticated animals by
improving their genotypes through selective mating.

5. Inbreeding
-Mating animals of the same
breed.
-Increases homozygous.
-Development of pure line.
-Eliminates harmful
recessive genes.
-Accumulation of superior
genes and elimination of less
desirable genes.
-But continued inbreeding
reduces fertility and
productivity.
It's called inbreeding
depression.

6. Outbreeding
Mating between unrelated
animals which may be
-between individuals of same
breed having no common
ancestors.
-between different breeds.
-between different species.

8. Outcrossing
-Mating of animals within same
breed but having no common
ancestors.
-Inbreeding depression can be
overcome.
-Best method for animal that are
below average in productivity.
-Infuses vigor qnd vitality in the
offsprings..
Due to this, outcrossing of pure
animals is preferred over impure
ones.

9. Crossbreeding
-Two animals of different breed but of
same species mated together.
-The offsprings produced will have
dominant characters of both animals.
-Done to develop new superior breads
and also to improve the quality of local
breeds.

10. Some examples of crossbreeding

11. Interspecific Hybridization
-Mating of male and female of two
different species.
-Offspring has desired characters of
both species.
-The hybrids are sterile.
Some example of interspecific hybridization

12. THANK YOU