Friday, February 17, 2012

OBJ - 5.11 Breeding animals

 Understand that animals with desired characteristics can be developed by selective breeding.

1. Farmers breed animals for similar reasons to the breeding of crops. They have selected for animals that:
  • produce more meat, milk or eggs
  • produce more fur or better quality of fur 
  • produce more offspring
  • show increases resistance to disease and parasites 
2. Eg: Cows --> milk/meat

The farmer selects his breeding cows which are producing a high yield ---> they become the breeding population --> they are selected for the desired characteristic. 

As we progressively 'select' we change the 
desired characteristic by selective breeding. This is done under the control of genes. 

No comments:

Post a Comment