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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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Top takeaways from December sire proofs

1. Sire proofs are now more accurate

The Council on Dairy Cattle Breeding (CDCB) is now using a new reference genome and additional SNPs to calculate genomic proofs. While this alone may not mean anything to you, it does affect some genetic ranks.

In addition to a different, updated reference genome they are also basing calculations off 80,000 SNPs, up from the previous 60,000.

To better explain, PEAK Geneticist, Doug Bjelland compares this to finding a house on a map. The previous reference genome and number of SNPs would help us locate on which street a house is located. The new update means we can find exactly where on that street the house is at. In short, these updates give us greater genomic proof accuracy.

Because of these updates, on average, industry sires changed as follows. However, individual bulls may have went up or down more than these averages.

  • HO daughter-proven sires: ↓8 NM$ | HO genomic-proven sires: ↓ 14 NM$
  • JE daughter-proven sires: ↓6 NM$ | JE genomic-proven sire: ↓18 NM$

 

Want more details on these changes, check out this CDCB article HERE.

2. You’ll find high ranking sires to fit your genetic plan

Because genomics gives us continual access to ever-increasing genetic levels, we have some exciting new bulls atop each of our marketing lists:

Whether you’re looking for Holsteins or Jersey sires, you’ll find the right ones to match your current situation and future goals, regardless of the customized genetic plan you’ve set for your farm.

3. Sire fertility matters

We want to help you create more pregnancies. So we keep you as informed as possible on updated sire fertility ratings on conventional and sexed semen. Look for the orange CONCEPT PLUS logo for conventional semen or the purple 511 CONCEPT PLUS logo to know which are the highest fertility sexed sires.

To implement a true precision approach to fertility management, work with your trusted advisor.

4. Sexed semen awareness

We know sexed semen demand continues to increase on progressive dairies around the world. And we’re working hard to accommodate that demand. With this proof round, we’re bringing greater access to more available sexed sires.

Whether you choose the newest Alta 511 SexedULTRA bulls or prefer known sexed fertility through 511 CONCEPT PLUS ratings, we have the right bulls to fit your genetic plan.

5. Beef x dairy is part of a genetic strategy

Have you kicked your genetic strategies into high gear by using beef on your lower end genetic animals? If so, we have the beef sires you need. We can help you create that pregnancy to reap the benefits of an immediate premium for the beef x dairy calves.

Visit us.altagenetics.com/beef, and work with your trusted advisor to implement this as part of your herd’s genetic strategy.

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Introducing JPI 2017

With April proofs comes the introduction of JPI 2017 to replace the previous JPI 2015.

Jersey Performance Index™ (JPI™) is the American Jersey Cattle Association’s (AJCA) strategy for increasing lifetime net income.

The AJCA took into account the following three key fundamentals for Jersey sustainability while determining JPI 2017. These fundamentals were determined by a Capper and Cady 2012 study comparing the environmental impact of Jersey and Holstein milk for cheese production.

  • Increase production
  • Maintain body size
  • Maintain or improve components

What is the purpose of the new JPI 2017?

  • Increase milk production
  • Improve the density of milk
  • Moderate body weight
  • Improve herd life, fertility, udder health, and functional conformation

What new traits have been added to the formula? 

  • CFP Milk
    • Every 100 pounds of PTA milk needs 8.8 pounds combined fat and protein
    • Pounds of Milk = CFP/0.088
    • CFP Milk = PTA Milk – Pounds of Milk
    • If CFP Milk is positive, the JPI™ value is negative because there is more water than components
  • Body Weight Composite (BWC)
    • Proxy for feed efficiency, and replaces body size composite
  • PTA Cow Livability
    • Measures a cow’s ability to stay alive on the farm

What is the impact of JPI 2017? 
  • Significant drops in JPI for all industry sires.
    • The upper JPI threshold will drop from about 300 JPI to 230 JPI, and all industry bulls will drop in their JPI value.
  • Significant rescaling, similar to a base change.
    • We see genomic sires JPI™ values fall 38 points on average
  • Some re-ranking – in both directions
    • Some minor and some significant

Here is a full breakdown of the new JPI 2017. In the simplest terms, JPI 2017 has five percent less weight on production and five percent more weight on type traits as compared to JPI 2015. But there’s more to it than that. The following traits are new additions to the JPI 2017 formula.

Image comparing the genetic index weights on production, health and type traits for JPI 2015 versus JPI 2017

JPI 2015JPI 2017
Protein4330
Fat1515
CFP Milk-8
PRODUCTION TOTAL WEIGHT5853
Productive life106
Cow livability-4
Somatic cell score66
Daughter pregnancy rate77
Cow conception rate22
Heifer conception rate22
HEALTH TOTAL WEIGHT2727
Stature-0.6-0.9
Strength-0.1-3.4
Dairy form2.0
Rump angle-0.1
Rump width0.2-0.7
Rear Legs -0.1-0.1
Foot angle0.10.1
Fore udder2.62.4
Rear udder height1.91.8
Rear udder width0.10.1
Udder cleft2.11.9
Udder depth5.14.7
Teat placement1.00.9
Teat length-1.0-0.9
TYPE TOTAL WEIGHT1520
No time is better than now to sit down and review your genetic plan and strategy. When you set your own unique herd index, you will maximize genetic gains in the areas that most impact your farm’s profitability.
Focus on your goals and work with your trusted Alta advisor to create a customized index as an investment in your future.
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