vikinggenetics-bulls-embryo-4.html
VikingNews UK 01 2015
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should i use
genomic
or daughter
proven sires
? h ave a look at table 1 ? this is the vikingholstein top 10 ntm ranking for daughter proven and genomic bulls. it?s easy to see that the ntm level is signifi- cantly higher in the genomic sires. there are four years of age difference between the two groups and with a yearly progress of three ntm-units the difference will be about 12 units. the benefit of using genomic sires is that in average you will have a higher genetic progress in your herd meaning higher profit- ability. the down side with the genomic sires is that the indexes are less reliable compared to the daughter proven. the aver- age reliability of the traits is from 50-70% depending on trait. daughter proven indexes when the daughters have finished second lactation obtain reliability from 80-99%. so the bene- fit of using daughter proven sires is that you are more certain of what you get. so the choice is yours! luckily vikinggenetics offers out- standing sires in both categories. always use genomic sires as a group when you use the genomic sires, it is crucial not to focus on a few sires . you should always use a group of sires that fits your goals. if you only use a few sires, your breeding program becomes very risky. because of the lower reliability some sires turn out not to be as good as expected when they get daughter proofs. but if you use a group of sires they will keep the expected level in average ? some will be better and some lower. can we then trust the genomic sires? yes, nordic cattle genetic evaluation (nav) is making routine checks if the genomic sires turn out as expected. the conclusion is clear: the genomic information is trustworthy. another interesting observation is that the 10 best daugh- ter proven sires shown in table 1 have 41 sons in the viking- genetics program today. eight of the 10 were used intensive- ly as genomic sires and also as sire of sons. the only two ones not being used are vh bentzen and vh sully that have turned out to be better than expected. transition from genomic to daughter information in most world wide breeding value estimation centers the transition from genomic information to daughter information is done in a way where the genomic information automatical- ly gets less weight when more and more daughter informa- tion becomes available. this is called a blending procedure. nav does not use a blending process and thereby also not the vikinggenetics sires. this is very important to have in mind when you look at the early daughter proven sires. nav is working on making this blending procedure, but does not have it ready yet. the most dairy farmers have been asking themselves if they should use genomic or daughter proven sires. the answer is: it depends on what you prefer as there are benefits and down sides using both categories of sires. with ntm +30 vh osmus is the best current, proven vikingholstein sire. this daughter is from rasmus kildal, denmark. table 1. top 10 daughter proven and genomic sires. indexes from feb. 2015 top 10 daughter proven sires ntm top10 genomic sires ntm vh osmus +30 vh lemek +44 vh grafit +28 vh griffin +42 vh mandel +28 vh bernell +41 vh peder +27 vh lomee +41 vh bentzen +26 vh blush +40 vh fanta +26 vh lot +39 vh oyvind +25 vh ohare +38 vh sully +25 vh gomorra +38 vh op +24 vh grace +38 vh clark +24 vh proud +38 5 february 2015 | vikingnews
information-daughter-genomic-6.html