The Bullvine decided to take a closer look at the top (2012 August) 100 GLPI Canadian Holstein young bulls. To make it more informative the analysis is by groups of 25. It is important to recognize that the average reliability values for these genomically tested young bulls are between 64% and 69% almost as high as some new release bulls in the past. Behind us are the days when young bulls indexes were 33% to 37% reliable and posed a much greater risk due to low reliability.

Production – all breeders are also milk producers

Young Bulls Average Rating

GLPI GroupMilk (kgs)Fat (kgs)% FatProtein (kgs)% Protein
All+2054+89+0.13+77+0.10
1 to 25+2303+96+0.10+86+0.11
26 to 50+2016+92+0.17+78+0.12
51 to 75+2012+84+0.09+74+0.09
76 to 100+1885+85+0.13+69+0.10

The top 100 GLPI young bulls are truly an elite group with production index values compared to recently proven sires of 98%RK for milk, 99%RK for fat and 99% RK for protein yields. An interesting note is how the top twenty-five stand out ten percent above the others, while each group afterwards drops by about 5-6%. A much greater variation than all other traits.

Type – important to predicting durability

Young Bulls Average Rating

GLPI GroupCONF (overall)MammaryFeet & LegsDairy StrengthRump
All+10.9+10.3+8.1+6.0+6.0
1 to 25+11.5+11.1+8.4+6.5+5.7
26 to 50+9.9+9.2+6.9+5.1+5.8
51 to 75+11.6+10.7+8.8+6.8+6.0
75 to 100+10.6+10.1+8.1+6.0+6.8

On average the type indexes of these top 100 GLPI young bulls are very high. The equivalent to a 98%RK for CONF for the recently proven sires. Note that the 26 to 50 group have the lowest type trait indexes to go along with high fat and protein especially for % Fat and % protein. In many cases, the bulls in the 26 to 50 group are the full or half brothers to the 1 to 25 group, who may have gotten more components but are not as high for CONF and Mammary.

Functional Traits – important but they have lower heritability’s

Young Bulls Average Rating

GLPI GroupHerd LifeDaughter FertilitySCSAverage H&F contribution to DGV LPI
All1101002.7089
1 to 25110992.6757
26 to 501101002.7185
51 to 751101002.7388
76 to 1001111012.70124

The average Herd Life and SCS ratings for these bulls are very good, positively contributing to H&F augmenting the GLPI values. However it must be noted that the Daughter Fertility ratings are only average detracting from the overall GLPI values for these bulls. Daughter Fertility is a trait that is primarily affected by non-genetic factors, but has a significant impact on the bottom line of any operation. The breed needs to be concerned because daughter fertility is not likely to see any significant gain genetically by using these bulls. As we all know more pregnancies equals more profits. Definitely more attention and more research needs to be given to the genetic evaluations and genetic merit of the breed for Daughter Fertility.

GLPI – the combination of production, durability and health/fertility

Young Bulls Average Rating

GLPI Group GLPIDGV LPIPA LPISire DGV LPIDam DVG LPI
All+2982+3161+2674+3056+2196
1 to 25+3218+3459+2784+3089+2599
26 to 50+2978+3127+2730+3191+2047
51 to 75+2900+3097+2592+2960+2052
76 to 100+2831+2960+2674+3056+2196

These top 100 GLPI young bulls are truly outstanding! They are exceeding by 982 LPI points the value required for a recently proven sire to get a 99%RK for GLPI. This was not even dreamed possible before there were genomic analysis using SNIP technology. Note that the Parent Average LPI’s are lower than GLPI’s and DGV LPI’s and are very close to being the same for all four groupings. It is in fact the young bulls DGV’s that put them in the top 100. They have full and half siblings that have lower DGV’s.  This supports our previous analysis of 7 Reasons Why You Shouldn’t Use Genomic Sires With DGV’s Lower Than Their Parent Average.  The AI sire analysts have made very good use to the DGV’s after initially identifying bulls from their pedigrees, and then sampling those who’s DGV’s exceed their Parent Average LPI’s by a goodly amount. Think about it, the average of the top 100 young bulls at +2982  GLPI, and there is only one Canadian proven sire above that level. It should be noted that the dams/ DGV LPI’s for the first grouping far exceed the other three groupings.  Even if you factor in for a slight decrease in values, the top 25 would still all rank higher than the highest current proven sire.

Pedigrees – more similar than desired

Inbreeding is a concern that must be addressed as the top 100 GLPI young bulls are from a limited number of parents (Read more – Inbreeding: Does Genomics Affect The Balancing Act?).

Sires of Young Bulls

The five sires with the most sons are:

  • Oman Oman 28%
  • Snowman 20%
  • Planet 10%
  • Observer 10%
  • Freddie 7%
  • Other 25%

With Oman Oman, Snowman and Freddie all Oman sons inbreeding must be watched. 82% of the young bulls are sired by daughter proven bulls and 22% are sired by genomic young sires.

Dams of Young Bulls

The sires of the young bulls’ dams most prevalent on the list are:

  • Planet 25%
  • Shottle 23%
  • Goldwyn 18%
  • Bolton 13%
  • Baxter 7%
  • Other 14%

The dams with the most young bulls are:

  • Gen-I-Beq Shottle Bombi – 5
  • Comestar Goldwyn Lilac – 4
  • Sandy-Valley Planet Sapphire – 3
  • Marbri Baxter Brandy – 3
  • Sully Planet Manitoba – 3
  • Ten dams with two young bulls each
  • Sixty-two dams with one young bull each

Definitely there is more pedigree variability amongst the dams than the sires of these young bulls. All dams are milking cows. Five dams are below +2000 GLPI, 33 dams are below +2000 DGV LPI and 6 dams do not have DGV LPIs as they reside outside North America.

Owners

The bull owners for the top 100 GLPI young bulls are:

  • Semex – 64%
  • Alta Genetics – 10%
  • Genervations – 10%
  • Select Sires – 6%
  • CRI – 5%
  • Other – 5%

NAAB – top 100 USA GTPI young bulls

The Bullvine is not able to do as  extensive an analysis on the NAAB list as the DGV TPIs are not available for analysis. Below are the average ratings for the top 100 young bulls. Note this group is similar to the Canadian one hundred young bulls – again a significant concern is that fertility is not high.

  • Milk +1503 lbs.
  • Fat +71 lbs. +0.06%
  • Protein +55 lbs. +0.04%
  • PTAT +2.93
  • UDC +2.57
  • FLC +2.06
  • Productive Life +6.3
  • DPR 0.7
  • SCS 2.68
  • Net Merit +774
  • TPI +2395

The Bullvine Bottom Line

The use of genomic testing has provided  a very significant opportunity to increase the rate of genetic improvement in herds that use North American sampled Holstein bulls (read more – The Genomic Advancement Race – The Battle For Genetic Supremacy). The top 100 GLPI young Canadian bulls are the equivalent to over 99%RK for recently proven sires. Congratulations to the breeders and breeding companies for using the genomic results to produce the young bulls. Thank you to the breeders who use the top young bulls. A bright future is ahead.


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