EBV’s and Accuracies

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Shorthorn Breed Average EBVs

Understanding the EBVs and Accuracies

EBVs

An animal’s breeding value is its genetic merit, half of which will be passed on to its progeny. While we will never know the exact breeding value, for performance traits it is possible to make good estimates. These estimates are called Estimated Breeding Values (EBVs).

In the calculation of EBVs, the performance of individual animals within a contemporary group is directly compared to the average of other animals in that group. A contemporary group consists of animals of the same sex and age class within a herd, run under the same management conditions and treated equally. Indirect comparisons are made between animals reared in different contemporary groups, through the use of pedigree links between the groups.

EBVs are expressed in the units of measurement for each particular trait. They are shown as + ive or – ive differences between an individual animal’s genetics difference and the genetic base to which the animal is compared. For example, a bull with an EBV of +50 kg for 600-Day Weight is estimated to have genetic merit 50 kg above the breed base of 0 kg. Since the breed base is set to an historical benchmark, the average EBVs of animals in each year drop has changed over time as a result of genetic progress within the breed.

The absolute value of any EBV is not critical, but rather the differences in EBVs between animals. Particular animals should be viewed as being “above or below breed average” for a particular trait.

Whilst EBVs provide the best basis for the comparison of the genetic merit of animals reared in different environments and management conditions, they can only be used to compare animals analysed within the same analysis. Consequently, Shorthorn BREEDPLAN EBVs cannot be validly compared with EBVs for any other breed.

Although EBVs provide an estimate of an animal’s genetic merit for a range of production traits, they do not provide information for all of the traits that must be considered during selection of functional animals. In all situations, EBVs should be used in conjunction with visual assessment for other traits of importance (structural soundness, temperament, fertility etc). A recommended practice is to firstly select breeding stock based on EBVs and to then select from this group to ensure that the final selections are visually acceptable.

EBVs are published for a range of traits covering fertility, milking ability, growth, and carcase merit. When using EBVs to assist in selection decisions it is important to achieve a balance between the different groups of traits and to place emphasis on those traits that are important to the particular herd, markets and environment. One of the advantages of having a comprehensive range of EBVs is that it is possible to avoid extremes in particular traits and select for animals with balanced overall performance.

 


Calving Ease EBVs (%) are based on calving difficulty scores, birth weights and gestation length information. More positive EBVs are favourable and indicate easier calving.

 


CE % Direct = Direct Calving Ease – The EBV for direct calving ease indicates the influence of the sire on calving ease in purebred females calving at two years of age.


CE % Daughters = Daughters’ Calving Ease – The EBV for daughters’ calving ease indicates how easily that sire’s daughters will calve at two years of age.


Gestation Length EBV (days) is an estimate of the time from conception to the birth of the calf and is based on AI and hand mating records. Lower (negative) GL EBVs indicate shorter gestation length and therefore easier calving and increased growth after birth.

 


Birth Weight EBV (kg) is based on the measured birth weight of progeny, adjusted for dam age. The lower the value the lighter the calf at birth and the lower the likelihood of a difficult birth. This is particularly important when selecting sires for use over heifers.

 


200-Day Growth EBV (kg) is calculated from the weight of progeny taken between 80 and 300 days of age. Values are adjusted to 200 days and for age of dam. This EBV is the best single estimate of an animal’s genetic merit for growth to early ages.

 


400-Day Weight EBV (kg) is calculated from the weight of progeny taken between 301 and 500 days of age, adjusted to 400 days and for age of dam. This EBV is the best single estimate of an animal’s genetic merit for yearling weight.

 


600-Day Weight EBV (kg) is calculated from the weight of progeny taken between 501 and 900 days of age, adjusted to 600 days and for age of dam. This EBV is the best single estimate of an animal’s genetic merit for growth beyond yearling age.

 


Mature Cow Weight EBV (kg) is based on the cow weight when the calf is weighed for weaning, adjusted to 5 years of age. This EBV is an estimate of the genetic difference in cow weight at 5 years of age and is an indicator of growth at later ages and potential feed maintenance requirements of the females in the breeding herd. Steer breeders wishing to grow animals out to a larger weight may also use the Mature Cow Weight EBV.

 


Milk EBV (kg) is an estimate of an animal’s milking ability. For sires, this EBV indicates the effect of the daughter’s milking ability, inherited from the sire, on the 200-day weights of her calves. For dams, it indicates her milking ability.

 


Scrotal Size EBV (cm) is calculated from the circumference of the scrotum taken between 300 and 700 days of age and adjusted to 400 days of age. This EBV is an estimate of an animal’s genetic merit for scrotal size. There is also a small negative correlation with age of puberty in female progeny and therefore selection for increased scrotal size will result in reduced age at calving of female progeny.

 


Carcase Weight EBV (kg) is based on abattoir carcase records and is an indicator of the genetic differences in carcase weight at the standard age of 650 days.

 


Eye Muscle Area EBV (sq cm) is calculated from measurements from live animal ultrasound scans and from abattoir carcase data, adjusted to a standard 300 kg carcase. This EBV estimates genetic differences in eye muscle area at the 12/13th rib site of a 300 kg dressed carcase. More positive EBVs indicate better muscling on animals. Animals with relatively higher EMA EBVs are expected to produce better muscled and higher percentage yielding progeny at the same carcase weight than will animals with lower EMA EBVs.

 


Rib Fat and Rump Fat EBVs (mm) are calculated from measurements of subcutaneous fat depth at the 12/13-rib site and the P8 rump site (from live animal ultrasound scans and from abattoir carcases) and are adjusted to a standard 300 kg carcase. These EBVs are indicators of the genetic differences in fat distribution on a standard 300 kg carcase. Animals with relatively lower fat EBVs are expected to produce leaner progeny at any particular carcase weight than will animals with higher EBVs.

 


Retail Beef Yield EBV (%) indicates genetic differences between animals for retail yield percentage in a standard 300 kg carcase. Animals with larger EBVs are expected to produce progeny with higher yielding carcases.

 


Intramuscular Fat EBV (%) is an estimate of the genetic difference in the percentage of intramuscular fat at the 12/13th rib site in a 300 kg carcase. Depending on market targets, larger more positive values are generally more favourable.

More information is available on BREEDPLANtraits and data on the BREEDPLAN website.

 


Accuracy

Accuracy (%) is based on the amount of performance information available on the animal and its close relatives – particularly the number of progeny analysed. Accuracy is also based on the heritability of the trait and the genetic correlations with other recorded traits. Hence accuracy indicates the “confidence level” of the EBV. The higher the accuracy value the lower the likelihood of change in the animal’s EBV as more information is analysed for that animal or its relatives. Even though an EBV with a low accuracy may change in the future, it is still the best estimate of an animal’s genetic merit for that trait. As more information becomes available, an EBV is just as likely to increase in value, as it is to decrease.

Accuracy values range from 0-99%. The following guide is given for interpreting accuracy:

Accuracy range  Interpretation
 less than 50%  Low accuracy.  EBVs are preliminary and could change substantially as more performance information becomes available.
 50-74%  Medium accuracy, usually based on the animal’s own records and pedigree.
 75-90%  Medium-high accuracy.  Some progeny information included.  EBVs may change with addition of more progeny data.
 more than 90%  High accuracy estimate of the animal’s true breeding value.

For further information please contact Shorthorn Beef or Shorthorn BREEDPLAN

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Quality Shorthorn commercial females have sold to a top price of $2,660 for a group of 3 year old PTIC Shorthorn cows.
The cows were sold by agents Milling Stuart, account of Todd and Sara Fergusson, Moreton Bay, at the Dunedoo Sale Yards after their herd was devastated by the February bush fires. The decision to sell the remainder of the herd was a difficult one as fences and feed were non existent on their property.
Given the many years of breeding on offered, the quality of females was excellent and prices reflected the Fergusson family's dedication with the top pen of 3 yo PTIC cows selling for $2,660 to Mike Newton, Miller Whan & John, SA, with the overall average for PTIC cows of $2,301. Two year old PTIC heifers also sold to a top of $2,220 to Muriel Capel, Barraba.
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Sprys Shorthorns have set a new Sprys on property record for their 2017 bull sale average, in their 53rd year of Shorthorn breeding, selling 40 Shorthorns sires to a top of $23,000 and an outstanding average of $10,600 in yesterdays sale. A large crowd formed in the gallery and bidding was strong throughout the sale, however there was also still good buying on offer with 10 sires selling for $6,000 or less.
In a twist, the $23,000 top priced bull, was purchased by commercial breeder, AM Childs, beating the attending seedstock buyers to secure the 13 month old roan bull. Outback Sprys Solid M259 is a son of Sprys Rock Solid H5 and from the Outback Patsy J15 dam with above average Growth, EMA and Marbling as well as a balanced profile with excellent softness.
In total, 7 Shorthorn sires sold for $18,000 or more at the Spry's on property sale, with a total of 6 of them purchased by commercial buyers, investing in quality genetics to further develop their commercial breeding herds.
The second top priced bull at $22,000 was lot 13, Outback Sprys Joker L287, a son of Outback Joker J328 from the Outback Isabella H97 dam, L287 was purchased by Ford Cattle Company, Tea Garden, NSW. Ford Cattle Company were the volume buyers at the sale, taking home 6 Shorthorn sires to average $11,000 for their purchasers.
3 Shorthorn females were offered, selling to a top of $14,000 to average $8,333. Top priced female was Lot 1. Sprys Athletes Pattie H236, a 4 year old daughter of Nentoura Athletic E13 and from the Sprys Jupiters Pattie B124 dam, selling to Spencer Fanily Shorthorns. H236 sold with a red bull calf at foot.
One pregnant recipient cow with a female pregnancy from the SBF Perfect Millie 19A donor and sired by US sire JSF Gauge 137W sold for $8,000 to Kamilaroi Shorthorns Tamworth.
Frozen embryo lots averaged $1,933 with the top lot selling for $2,600 per embryo for the joining of The Grove Kookaburra W735 and from Sprys donor, The Grove Primrose A742.
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Sprys Shorthorns Annual Bull and Genetics Sale to be held tomorrow, Friday 21st, commencing 1pm.
The sale will be interfaced with AuctionsPlus, for those who can't attend the day.
Please click on the link here, auctionsplus.com.au/auctionV2/New/#/catalogue/10315
to view the AuctionsPlus catalogue and register for bidding if you haven't already done so.
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Shorthorn Beef shared Belmore Shorthorns's video. ... See MoreSee Less

Here are some of the Buyers Choice Heife...

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