milk-ntm-yield-6.html
VikingNews UK 02 2016
7 / 24
genomic
breeding predicts milk production better than pedigree index
a total of 10,000 heifers were included in the studies and they were divided into four groups. the first group with the 25% lowest index for protein yield
and fourth groups with the 25% highest index for protein yield. (figure 1 shows the average in protein yield for the four groups). the red bars show average for heifers based on pedigree index one year before calving and the blue bars show average for heifers based on genomic indexes before calving. for heifers sorted on pedigree information, the difference in protein yield between highest and low- est group was 21 kg. corresponding fig- ure for heifers sorted on genomic values was slightly bigger, 24 kg. figure 1 clearly shows that the high- er the index in the group before calv- ing, the higher protein production they got during first lactation. the genomic breeding value was also better in pre- dicting the future protein yield than pedigree index. the result was the same also for milk yield, where the dif- ference between highest and lowest 25% was 583 kg. corresponding figure for fat yield was 34 kg. basically, the study was based on genomic tests made before 2014. after august 2014, the reliability of the genomic breeding values has increased significantly due to females in the refer- ence population, and the difference be- tween groups is even higher today. data from the ld-project* the data in this article is from all dna-tested vikingred heifers included in the ld-project. in the study are about 10,000 dna-tested females of which 2,600 also have results from milk pro- duction in first lactation. the genomic breeding value before calving has been compared to production during first lac- tation. the genomic values have also been compared with the heifer?s pedi- gree index one year before calving. *ld-project= subsidies from vikinggenetics to do genomic test of all females in a herd. in his master thesis, agronomist christian bengtsson shows that genomic breeding values for vikingred in sweden predict their future milk production better than a pedigree index. by christian bengtsson, master thesis at vikinggenetics figure 1. correlation between milk yeld index and protein yield average for protein yield for 2488 vikingred cows divided into quarters based on pedigree index one year before calving or genomic breeding values just before calving. -15 -10 -5 0 5 10 15 20 proteine (kg) bottom 25% bottom 25-50% top 25-50% top 25% -7 -8 -1 8 0 7 14 16 ranked by parental average ranked by genomic prediction 7 june 2016 | vikingnews
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