Pedigree chart 1 is an example and explanation and pedigree chart 2 is what the questions solely based on.  Pedigree Chart 1 Lot 69 (Bay Milly)                                  ...

Pedigree chart 1 is an example and explanation and pedigree chart 2 is what the questions solely based on. 

Pedigree Chart 1

Lot 69 (Bay Milly)

                                                                                                                               

 (sire)                             Dairy king (USA) ………..  Northen dancer ……… by Neartic

 Encosta de lago ............                                        Fairy bridge  ............. by Bold reason

                                      Shick creek …………….     Star war ………………   by Star appeal

                                                                             Rolls (USA) …………  by Mr prospector

(Dam)                             Flying spur …………….....  Danehill ………………  by Danziy

 Anything lo ..................                                        Rolls (USA) …………  by Mr prospector

                                      Professionelle ................. Canteen ..................  by Century

                                                                             Star of the day .......... by Tritan  

This way of giving a pedigree has the parents (sire and dam) of the horse on sale (Lot 69) on the left, with earlier generations continuing to the right. In the last generation given on the right (ie great-great-grand parents), only the sires are listed. In the pair-wise listing of parents, sires are on the top, dams are underneath, and the dotted lines indicate the matings. In addition these pedigrees have the names of sires and dams in the most recent generations that are present more than once indicated in bold, except if directly to the right (ie a parent of one already in bold), as clearly a horse given twice has the same parents. (You can see this above, “Mr. Prospector” is not bold).

Pedigree chart 2

Lot 23 (Balley)

(Sire)                           Octopus (NZ) .................... Zabel (NZ)  ................   by Sir tatum (Ire)    

Rohro        …..……….                                              Eight bay (GB) ............. by Pieces of one

                                    Shadea    .......................... Star strike (USA) ...........by Mr. prospector                                                    

                                                                                 Concia (NZ) ................. by First council (USA)

                                     

(Dam)                           Rhythm (USA) ................... Mr. prospector  ........... by Raise a native  

Purple rain ………….                                                  Dance number  ............. by Northern dancer

                                     Irisses         ……………….      Tate gallery (USA) ………. by Northern dancer

                                                                                   Gipsy land        …….……  by John land

1. Draw the pedigree for Lot 23 (Name a few of the key horses; no need to name all in the pedigree)

2. Is Lot 23 inbred? Explain your reasons.

3. Calculate the inbreeding coefficient for Lot 23.

4. Is the bolding of “Northern Dancer” in the pedigree of relevance to the inbreeding of Lot 23? Explain your answer.

5. Which horse in the pedigree is inbred from “Northern Dancer”, and why?

6. Is this horse more or less inbred than Lot 23?

                                                                       

Asked on by matthew23

1 Answer | Add Yours

sciftw's profile pic

sciftw | High School Teacher | (Level 1) Educator Emeritus

Posted on

Yes, lot 23 is inbred. The reason it is inbred is because Rohro and Purple rain are both descendants of Mr. Prospector.  Mr. Prospector appears in both pedigree lines, and his descendants are the two horses being auctioned off as lot 23.  

The bolding doesn't matter, because it's clear that Northern Dancer fathered two lines that were cross bred. Northern Dancer genetically passed traits to Tate and Dance Number. Tate passed traits to Irisses. Dance passed traits to Rhythm.  Both Rhythm and Irisses were then bred together. That would be like a father having two wives and then grandchildren from each side interbreed.  So Purple Rain is the inbred horse from Northern Dancer. Yes it is more inbred than lot 23 because lot 23 is further down the "family tree."  Lot 23 represents great grandchildren while Purple Rain is only a grandchild.  

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