Calculation of lifetime net income per year (LTNI/year) of Australian Holstein cows to validate the Australian profit ranking of their sires. 2. Validation of the Australian profit ranking of sires and test for genotype by environment interaction based on LTNI/year
M Haile-Mariam, PJ Bowman, ME Goddard
Animal Production Science | CSIRO PUBLISHING | Published : 2010
In Australia, the Australian Dairy Herd Improvement Scheme publishes the Australian profit ranking (APR), which is an economic index combining all economic traits. The APR is used to select sires that will breed the most profitable daughters. The objectives of this study were to test the predictive power of the APR by looking at the relationship between the APR of sires and lifetime net income per year (LTNI/year) of their future daughters and to test if this prediction was accurate in different types of herds. The importance of re-ranking was also tested by considering LTNI/year of cows in different herds as different traits and estimating the genetic correlation between LTNI/year in differ..View full abstract
This research is funded by Dairy Australia and the Victorian Department of Primary Industries. We thank ADHIS for providing the data. We also thank Dr Kon Konstantinov and Kevin Beard for their help with obtaining ABV of bulls.