The genetics

Inbreeding

The inbreeding is the mating of relatives dogs first  Degree-ie father / daughter, mother / son or the mating of full siblings.

An inbreeding may, in exceptional cases, take place only with permission.

There is a risk of duplication diseased genes.

 

2 Inbreeding

The inbreeding is a selective breeding of dogs related to each other are closer than the average of the breed. They have common ancestors.  The inbreeding always causes an increase in homozygosity.

For the calculation of inbreeding serves the inbreeding coefficient (IC) for possible objective comparison between different degrees of relationship.

From a dog genes are only 50% of the offspring delivered to. Of these, only 25% of the grandchildren and great-grandchildren, 12.5%.

The inbreeding effect of doubling the function of one or more ancestors in the pedigree of the father and mother.

When inbreeding is hoped that a desired genes or ancestors occur occur twice if necessary.

The higher the degree of inbreeding, the higher the proportion of genes that are doubled. But both the positive and negative effects are the more likely and more significant the more the inbreeding is operated.

The ancestral loss coefficient (AVK) is the second Possible to calculate the inbreeding. It is calculated by dividing the number of actual ancestors, and the total number of possible ancestors.

The more ancestors in a pedigree occur repeatedly, the more a dog is inbred.

 

Line breeding

Line breeding is a form of moderate and sensible inbreeding.

The two breeding partners are related, but not as tight as in the inbreeding.

A breeding should take place only in breeding animals, relatives and ancestors are no genetic defects that occurred at.

This is due to the doubling of disease-causing genes and the increase of homozygosity at the mating and more distantly related animals.

The aim of line breeding is to improve properties to enhance desired degree of homozygosity and the features described in the standard to consolidate certain.

This is achieved by doubling the positive genes and characteristics.

In line breeding can not only positive but also negative features double.

Therefore, the line-breeding to be carried out responsibly.

 

Characteristic breeding

In the characteristic breeding breeding partner plays the degree of relationship to each other is irrelevant.

There is a selection of breeding animals for specific traits, so a breeding with the same breeding partners in the phenotype (physical appearance).

 

 

Foreign breeding or out-crossing

 

In the third breeding mates are less related than the average population or race.

It is the opposite of inbreeding.

In the foreign breed heterozygosity will increase.  This is especially important in breeding lines that have a degree of inbreeding. Because the degree of heterozygosity increases and contributes to maintaining the health of strain and breed in the.


 Prepared by the Rhodesian Ridgeback breeders:
Mashambani

& Mhangura