american hairless terrier pedigree database
The database is a work in progress but should be available soon. In the meantime we are accepting new dogs. Please use the form below to submit your dog. New submissions are not automatically added. They will be reviewed and then uploaded. Updates may take a few weeks to complete. The database is the work of multiple individuals sharing information. Please report incorrect information to poiseaussies@me.com. Picture have been collected from a variety of source. If you wish picture to be removed, please notify poiseaussies@me.com and they will be removed immediately.
The Pedigree w/ Links page will take a while to load since it includes pictures as well. Please be patient.
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Understanding Terminology
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COI- Coefficient Of Inbreeding: Essentially, it measures the common ancestors of dam and sire, and indicates the probability of how genetically similar they are. The original purpose of the coefficient of inbreeding was to give breeders a number that would indicate both the amount of benefit to be gained from inbreeding as well as the magnitude of the deleterious effects they could expect. The trick for the breeder then is to weight the benefits and risks of a particular breeding and judge what is an acceptable balance. A low COI will have low risk, but it will also only have a modest benefit. A high COI would produce more consistency and prepotency in the offspring, but there will also be a significant loss of vigor and health. The deleterious effects of inbreeding begin to become evident at a COI of about 5%. At a COI of 10%, there is significant loss of vitality in the offspring as well as an increase in the expression of deleterious recessive mutations.
Parent/offspring: 25%
Full sibling: 25%
Grandparent/grandchild: 12.5%
Half sibling: 12.5%
Great grandparents/great grandchild: 6.25%
First cousin: 6.25%
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ALC or AVK-Ancestor Loss Coefficient: For a particular number of generations, just count all the different ancestors and divide by the number of possible ancestors. For example, in a three-generation pedigree (parent, grandparents, and great-grandparents) there are 14 (2+4+8) possible ancestors. If all the ancestors are all different, the ALC will be 1; if any ancestors are repeated, the ALC will be less than 1. The more repeated ancestors there are, the smaller the ALC. Just like COIs, ALCs are dependent on the number of generations of the pedigree used in the calculation. So when talking about a particular ALC, one must also mention how many generations were used in the calculation of the ALC.
So what is a good ALC? The Finnish Kennel Club has put out a document "General Breeding Strategy" ([1]) where they make recommendations about breeding. They discuss genetics diversity, and on page 12 make the following recommendation - a dog should
1. have a three-generation ALC of 1 (this means that all the ancestors in the first three generations are unique), and
2. a four-generation ALC greater than 0.9 (this means that in a four-generation pedigree 90 percent of the ancestors should be different).
Example: A 6-generation pedigree contains 126 dogs. If this pedigree really consists of 126 unique dogs, then we have NO Ancestor loss (0%). A pedigree with some inbreeding might have only 114 unique dogs in these 6 generations, this equals to an Ancestor Loss of 10%.
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COR- Coefficient of Relationship- It is only calculated for tow animals being considered for a potential breeding, and it gives an indication of "how related" those two animals are. A lower number is preferable. Sometimes in the literature, you may see COR abbreviated as RC.
The Pedigree w/ Links page will take a while to load since it includes pictures as well. Please be patient.
**************************************************************************************************************************************
Understanding Terminology
**************************************************************************************************************************************
COI- Coefficient Of Inbreeding: Essentially, it measures the common ancestors of dam and sire, and indicates the probability of how genetically similar they are. The original purpose of the coefficient of inbreeding was to give breeders a number that would indicate both the amount of benefit to be gained from inbreeding as well as the magnitude of the deleterious effects they could expect. The trick for the breeder then is to weight the benefits and risks of a particular breeding and judge what is an acceptable balance. A low COI will have low risk, but it will also only have a modest benefit. A high COI would produce more consistency and prepotency in the offspring, but there will also be a significant loss of vigor and health. The deleterious effects of inbreeding begin to become evident at a COI of about 5%. At a COI of 10%, there is significant loss of vitality in the offspring as well as an increase in the expression of deleterious recessive mutations.
Parent/offspring: 25%
Full sibling: 25%
Grandparent/grandchild: 12.5%
Half sibling: 12.5%
Great grandparents/great grandchild: 6.25%
First cousin: 6.25%
**************************************************************************************************************************************
ALC or AVK-Ancestor Loss Coefficient: For a particular number of generations, just count all the different ancestors and divide by the number of possible ancestors. For example, in a three-generation pedigree (parent, grandparents, and great-grandparents) there are 14 (2+4+8) possible ancestors. If all the ancestors are all different, the ALC will be 1; if any ancestors are repeated, the ALC will be less than 1. The more repeated ancestors there are, the smaller the ALC. Just like COIs, ALCs are dependent on the number of generations of the pedigree used in the calculation. So when talking about a particular ALC, one must also mention how many generations were used in the calculation of the ALC.
So what is a good ALC? The Finnish Kennel Club has put out a document "General Breeding Strategy" ([1]) where they make recommendations about breeding. They discuss genetics diversity, and on page 12 make the following recommendation - a dog should
1. have a three-generation ALC of 1 (this means that all the ancestors in the first three generations are unique), and
2. a four-generation ALC greater than 0.9 (this means that in a four-generation pedigree 90 percent of the ancestors should be different).
Example: A 6-generation pedigree contains 126 dogs. If this pedigree really consists of 126 unique dogs, then we have NO Ancestor loss (0%). A pedigree with some inbreeding might have only 114 unique dogs in these 6 generations, this equals to an Ancestor Loss of 10%.
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COR- Coefficient of Relationship- It is only calculated for tow animals being considered for a potential breeding, and it gives an indication of "how related" those two animals are. A lower number is preferable. Sometimes in the literature, you may see COR abbreviated as RC.
We are extremely grateful to Gina Li for helping with the coding on the Pedigree Database.