GENOMIC CORNER
Emma Jones takes a look at how some young genomic bulls are performing now that they have graduated as proven sires
and see how they compare from their genomic index to their daughter proof today. The bulls that are being compared have been selected at random by looking through the ‘Top 20 Young Genomic Sires’ list of April 2012. When looking at the comparisons, it is benefi cial to know that with the recent August Production Base Change, there have been some recalculations. The table shows the weightings and how they have been changed within the Holstein breed.
M
August Production Base Changes Milk kgs Fat kgs Prot kgs Fat % Prot % SCC Lifespan Fertility -167
-6.3 -4.5 0.00 0.01 4 -0.1 -0.1
Whether you want to use young genomic sires is completely up to you. As they say, the proof is in the pudding. So take a look at what these sires were predicted to transmit two years ago, and compare their fi gures to how their daughters are performing today throughout the world, bearing in mind the production base changes that have taken place since April 2012.
‘ 116 THE JOURNAL OCTOBER 2014
It is important to use a variety of genomic sires
Final thoughts
As can be seen on the opposite page, some of the chosen sires are performing similar to their genomic prediction of 2012 now that they have daughters in their 2014 proof. There will be some bulls you use that won’t perform quite as well as the group opposite, and equally there will be bulls that will perform better; that is why it is important to use a variety of genomic sires across your herd.
’
However, with some of these sires not having daughters milking in the UK, it will be interesting to see how some of these bulls progress over the next two years as daughters are added to their UK proof.
any may be sceptical about genomics; “I don’t trust it,” is a phrase that is heard a lot. With this in mind, I thought it may be interesting to have a look at a few sires
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