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Category Archives: Dairy News

Jersey generation counts and breed purity

Breed purity is a hot topic for Jerseys.

Many elite Jersey sires have Holstein heritage somewhere in their pedigree. The Jersey Genetic Recovery and Jersey Expansion programs have allowed those bulls to upgrade to registered status.

These programs allow breeders to enroll animals that appear as Jerseys, or are sired by a Jersey bull, into the herd registry. While the programs are beneficial in growing the registered Jersey population, many producers are now confused as to just what qualifies an AI bull as a Jersey.

The American Jersey Cattle Association (AJCA) board of directors developed some visual cues within an animal’s registered name to eliminate confusion on Jersey breed purity.

Generation Count and a JX prefix have been added to full names to signify a hole in the pedigree or unknown dairy ancestry. Breed Base Representation (BBR) is now displayed on all animals recorded with the ACJA to represent the amount of Jersey blood within the pedigree.

Generation Count (GC)

Generation Count shows breed purity by telling how many generations an animal is removed from other breed ancestry. An animal’s name will include a suffix enclosed in brackets {  }. The number within the brackets tells us the number of AJCA-recoded ancestry, from 1-6.

A GC of 1 means the animal is one generation removed from an unknown or non-Jersey in the pedigree. A GC of 6 means the animal is six generations removed from an unknown or non-Jersey animal. The brackets telling the generation count are dropped when seven or more generations of ancestors are recorded by the AJCA.

Offspring of a mating will be one generation count higher than the lowest parent.

JX Prefix

In addition to the number within the brackets, a JX prefix is also found on the majority of the pedigrees that contain a generation count. The JX prefix indicates that there is unknown dairy (most commonly Holstein) parentage in the pedigree. The GC then tells us how far back in the pedigree the unknown dairy breed can be found.

If you see a bull with a GC but no JX prefix, that means that the missing part in the pedigree is an unidentified Jersey.

Breed Base Representation (BBR)

BBR is a genomic trait that compares the DNA of a genotyped animal to a Jersey reference group and all other breeds. The Council on Dairy Cattle Breeding (CDCB) policy is to report BBR values of 94 or greater as 100 due to standard deviations. Bulls below BBR 94 will be noted on their pedigree. The AJCA will publish a BBR value for all recorded animals.

Males will be published on one of two reports.

Males on the main list include those who:

  • are Herd Registered
    • more than 6 generations of identified Jersey parentage
  • have a Generation Count of 4-6 and a BBR of 100

Males on the secondary list include those with a:

  • Generation Count of 3 (regardless of BBR)
  • Generation Count of 4-6, if their BBR is less than 94

The examples below show the bull pages for three bulls with different breed purity. It explains where to find generation count, the JX prefix and breed base representation.

AltaBAYNES {3}

A. The 3 in brackets shows that AltaBAYNES is 3 generations removed from non-Jersey ancestry.
B. The JX prefix in his full, registered name, means that the missing link in his pedigree, 3 generations back, is not a Jersey.
C. Shows AltaBAYNES’ BBR to be 98, meaning he has 98% of his genes in common with the reference Jersey population.

Offspring of AltaBAYNES will be Generation Count 4 and Non-HR.

AltaMONTRA {6}

A. The 6 in brackets shows that AltaMONTRA is 6 generations removed from non-Jersey ancestry.
B. The JX prefix in his full, registered name, means that the missing link in his pedigree, 6 generations back, is not a Jersey.
C. Shows AltaMONTRA’s BBR to be 100, meaning his genes are all in common with the reference Jersey population.

Offspring will be Generation Count 6 if he is mated to a GC 5 female. Offspring will be HR (herd registered) if he is mated to a GC 6 or HR female

AltaCHIVE

A. Because there is not a bracketed number with AltaCHIVE’s name, that means he is herd registered, with either with no ancestry that is non-Jersey, or any non-Jersey ancestry is further back than 6 generations.
B. Because there is no non-Jersey ancestry within the first 6 generations of AltaCHIVE’s pedigree, he also does not have a JX prefix in his full, registered name.
C. Shows AltaCHIVE’s BBR to be 100. As expected, that means his genes are all in common with the reference Jersey population.

Offspring will be HR with no generation count if he is mated to a GC 6 or HR female.

At Alta, we are committed to providing you with the most reliable genetics available. In order to fulfill this promise, we offer a diversified Jersey product lineup focusing on the traits that are most profitable to your bottom line.

We have the highest level of confidence in the genetic and genomic predictions of BBR 100 bulls, and offer many s and the performance those daughters realize in the milking herd. We recognize that clients have choices, so we will always market with full transparency.

To learn more about the Rules for the Registration and Transfer of Jersey Cattle, click HERE.

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Haplotype & genomic reliability updates

Based on new findings from the Council on Dairy Cattle Breeding (CDCB), one new haplotype will be added, and two others removed, starting with December 2018 proofs. Alta Bull Search and Alta GPS will be programmed according to this new information.

A new Holstein haplotype, HH6, was recently identified in France, and is currently found in about 0.5% of animals in the US Holstein population. Mating two HH6 carriers is expected to yield a 7%-11% drop in conception rate.

Further research into the JH2 haplotype in Jerseys and the BH1 haplotype in Brown Swiss showed no significant fertility losses on matings between carriers. This, paired with the fact that researchers could find no causative mutation on these two haplotypes, means they will no longer be reported.

Gene test advancements

In addition to new and discontinued haplotypes, the reported haplotypes are also gaining accuracy. PEAK Geneticist, Doug Bjelland, compares the improved accuracy of haplotypes to locating a house on a map. The previous way of recognizing haplotypes essentially showed us which street a house is located on. Now, because of gene test advancements for causative mutations to determine haplotypes, we know exactly where on that street a house is located.

Upgraded genomic reliability

Improved genomic accuracy also extends beyond the gene test. Researchers are now using an 80k SNP chip. This means they are using nearly 80,000 markers on the genome, up from the previous 60,000 used since 2014.

The additional markers, combined with a new reference genome, give genomic predictions about a 1% – 2% improvement in reliability.

What does this mean for you?

We want to keep you up-to-date on the newest genetic findings. Updates on haplotypes and genomic accuracy are one part of that. Because the haplotype updates will be accounted for within the AltaGPS program, you can have confidence that potential carriers of two bulls will not be mated together. That means your clients are protected from any potential fertility losses that could result in mating two carriers of any given haplotype.

Improved genomic accuracy should give you, and your clients, even more confidence that genomics and genetics continue to advance at more rapid rate. It’s as important now as it ever has been, to ensure your clients select genetics according to their customized genetic plan so the progress they make aligns with their current situation and future goals.

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A Q&A on DWP$ and WT$ – Dairy Wellness Profit $ / Wellness Trait $

Dairy Wellness Profit $ and Wellness Trait $ indexes

The Dairy Wellness Profit $ and Wellness Trait $ indexes may have you wondering whether you should adjust your genetic plan to include this information. We want to help you decide what’s best for your dairy. So we answer a few questions about DWP$ and WT$ to help you better understand these indexes.

What is Dairy Wellness Profit $ (DWP$)?

Dairy Wellness Profit $ (DWP$) is a genetic selection index. It equates to a genetic plan of 34% production–56% health–10% conformation. This differs from TPI (46-28-26) and the overall NM$ index (43-41-16).

The breakdown of the weight on health is different as well. DWP$ puts 30% of the health trait weight on WT$. This leaves 26% for the CDCB evaluated health traits of PL, DPR, SCS, DSB, DCE, CCR, HCR.

What is Wellness Trait $ (WT$?)

WT$ is a combination of the Wellness Traits (ketosis, displaced abomasum, retained placenta, metritis, mastitis and lameness). This means it is an index analogous to a 0-100-0 index, with 100% weight on health traits. However, those weights are divided between the various Wellness traits that Zoetis calculates.

Do each of the Wellness Traits get their own evaluation?

Yes. They are then combined into a Wellness Trait $ index to combine the expected impact.

Does Alta test all bulls for DWP$ and WT$?

No, but we test the sires that we predict will do well on the respective indexes. We test our bulls that have favorable health trait values and rank well on a 34% Production-56% Health-10% Conformation index. We list the top ten DWP$ sires and top five WT$ bulls in each of three categories: G-STARS, FUTURE STARS and daughter-proven sires.

What is Alta’s testing plan going forward?

This will be dependent on the feedback from the customers and the demand for this information. In the short-term we will continue to test those sires that rank well on a traditional 34-56-10 index.

How can we predict which sires will do well on these indexes?

Because the correlation between DWP$ and a traditional 34% production – 56% health – 10% conformation index is very high, we can predict quite well which sires will rank well on the DWP$ index.

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Alta Genetics Bull Search app now available!

Alta Genetics Bull Search app now available!
Genetic planning for your herd is now simpler than ever with the all new Alta Bull Search app for iPhone.

In addition to Alta’s comprehensive online Bull Search, iPhone users now have the added functionality to search for the right bulls to meet their goals using the Alta Genetics Bull Search app.
The brand new app allows you to find rankings for sires that best fit your genetic plan and to see individual sire proofs on Alta bulls and all active industry sires with a TPI greater than 1700. Once the app is downloaded, internet connectivity is not needed to browse.
At Alta, we prefer not to rate bulls only on single traits or industry standard indexes. Our goal is to create value with your end result in mind – a productive and profitable herd. Since we know that standard genetic indexes do not match everyone’s goals, we took the industry lead to work with a variety of customized breeding goals and genetic plans.
We hope you enjoy the first release of the iOS version of the Alta Genetics Bull Search app. Coming soon will be an Android version of the app, as well as new and more proof information and additional functionality to both app versions.
Please click here to download the all new Alta Genetics Bull Search app to your iPhone.

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