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Lesson 13 Assignment

L. R. Schaeffer, March 1999

Below are data on weaning weights (in pounds) of calves of one breed of beef cattle. Assume a maternal effects animal model.

Calf | Sire | Dam | CG | Weight |

4 | 14 | 2 | 1 | 500 |

5 | 15 | 1 | 1 | 550 |

6 | 15 | 3 | 1 | 575 |

7 | 14 | 1 | 2 | 560 |

8 | 15 | 2 | 2 | 495 |

9 | 14 | 3 | 2 | 515 |

10 | 16 | 4 | 3 | 540 |

11 | 16 | 5 | 3 | 520 |

12 | 15 | 7 | 3 | 530 |

13 | 14 | 6 | 3 | 580 |

Assume that

and and . CG stands for contemporary group. All calves were female. All weights are expressed as 200-day weights.

- 1.
- Write the model for these data.
- 2.
- Construct HMME and solve.
- 3.
- Partition the direct genetic solution for animal 7 and also partition the maternal genetic solution for animal 7.
- 4.
- Partition the direct genetic solution for sire 14.
- 5.
- (Extra Points) Show one iteration of REML estimation of the parameters or one round of Gibbs sampling.

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