Transcript Selective Breeding – In Chickens

Selective Breeding –
In Chickens
Merlyn Lobo
10 – ME
WHAT IS SELECTIVE
BREEDING?
 Breeding plants and animals to obtain desired
characteristics
 Selection of animals and plants for particular characteristics
over many generations.
 e.g. chickens for egg production
 Selective breeding breeds out unwanted alleles from the
population, deliberately restricting the variation
 Over generations of breeding out variation it leads to a
population where all animals have the originally desired
qualities but massively reduced genetic diversity.
Some Types of Selective Breeds –
Chickens…(1)
HYBRID CHICKENS
For lots of eggs every year then you
should look at the hybrids.
These have been created by
recent intensive selective
breeding by man.
For example…We use the black
rock (a breed of chicken) is bred
from specially selected pure
breed parent stock. The result of
this breeding is that they are
much more productive than the
present day utility pure breeds
and have superb disease
resistance in comparison to the
other hybrids.
Some Types of Selective Breeds –
Chickens…(2)
UTILITY PURE BREEDS
If you like the idea of pure
breeds you will get birds
with fascinating history, a
wider variety of sizes and
plumage and, if you choose
carefully, pure bred
chickens will provide you
with eggs that will easily
fulfill a family's needs.
Farmers to ensure that the
stock you get are from
known utility parent
flocks.
Different Types of Eggs
EGG LAYERS
Do you want white eggs? Leghorn
Do you want deepest brown - Welsumer
Or Marans are good
Mid brown - Rhode Island Red
Advantages of Selective Breeding in
Chickens
 Some benefits to selective breeding is that breeders get to choose which
animals fit their criteria, so more of the right kind of animal can be
produced, which makes more product.
 E.g A farmer wants chickens that produce bigger eggs and more eggs,
not chickens that don’t produce any. The farmers now have the ability
to choose what chickens they want to increase egg production and the
size of the eggs. Chickens may also be selectively bred for more meat
than the normal chickens
 In the long term, it actually provides an advantage if organisms have
dissimilar pairs of genes for any hereditary characteristic.
Disadvantages of Selective Breeding
of Chickens
Overuse of selective breeding can result in
genetic disorders, such as inbred depression.
 Selective breeding of particular genes runs
the risk of losing some of the other genes
from the gene pool altogether, which is
IRREVERSIBLE.
Be Organic !
Be Happy !!
Be Healthy !!!
THANK YOU !