Methodologies for Population/Quantitative Genetics
Animal Science 562
Exercise __
Genetic Prediction of Breeding Values By Using Animal Models
Objectives:
To learn how to fit a reduced animal model.
To estimate genetic and environmental trends.
To compare solutions for breeding values using a genotypic animal model and a reduced
animal model.
2
Data: Performance data for this assignment is 260-day weight of pigs. We will assume h = 0.3
for all calculations.
-1
Files: Both data and R for the RAM model are provided.
Data: /home/pjberger/anonymous/prob6.data
-1
R : /home/pjberger/anonymous/prob6.Ri
Assignment:
1. Set up and solve the reduced animal model equations for this data.
2. Summarize the contemporary group solutions.
Contemporary
Group
Mean
Mean
Solution
Difference
Breeding Value
81
82
83
84
3. What is the environmental trend?
4. Calculate the mean breeding value of all animals in each contemporary group.
Animal Science 562
5. What is the genetic trend?
2
Animal Science 562
Exercise 6. Summary of predictors.
Contemporary
Animal
y
group
^y
^
Xb
1
-
-
-
-
-
2
246
84
3
-
-
-
-
-
4
-
-
-
-
-
9
-
-
-
-
-
10
237
82
11
220
82
12
215
82
13
200
82
14
260
83
15
243
83
16
200
83
17
231
84
18
222
84
19
250
84
20
244
84
21
221
84
22
246
84
23
237
84
24
242
84
3
^u
^e