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Genetics review: “If you aren’t buying bulls with EBVs in the top 50pc of the breed, you’re going backwards” + Video

by Wayne Upton*, 05 July 2018
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CONGRATULATIONS to stud breeders across the New England region who opened their herds for scrutiny during Beef Week recently. Cattle were presented in excellent condition despite the very harsh season being experienced.

Among them was David Murray, Kilburnie Angus, Walcha, has been breeding Angus since 1983. He has been a student of genetic evaluation principles, buying his first bull on recorded performance from Trangie Research Station in the late 1970s.

A one-time academic at the University of New England, David left the halls of academia to concentrate on breeding high performance Angus.

David Murray

He uses EBVs and Indexes to select his stud sires along with visual inspection for structural soundness and to ensure they are ‘acceptable’ to cattlemen.  Sires for AI use are only selected if they are in the top one percent of all Angus indexes.

Education of bull buying clients has been a particular mission of David and his wife Sue, taking every opportunity to run workshops and field days to inform their bull buying clients on latest technologies, especially on the value of EBVs and Indexes.

While more and more clients are understanding and using EBVs, he thinks that the way EBVs and Indexes are presented is particularly important.

“They must be presented in as simple a fashion as possible,” he said.

In keeping with this belief, Kilburnie sale draft will this year have EBVs and Indexes presented as percentile rankings, as well as the EBV values (see graphic below).

David says the important thing for buyers to know is where the bulls rank in the breed, rather than their actual values.

“If you are buying bulls that are below 50pc, you are going backwards,” he said.

Dogged pursuit of performance recording

As acknowledged by Sue Grant in a reader comment following last week’s column, Angus success has resulted from breeders displaying ‘dogged pursuit of performance recording’.

Angus lead the way in terms of genetic progress, but other breeds are catching up. The Shorthorn breed for many years published an index without having a ‘days-to-calving’ EBV, and hence the breed’s progress was limited by the inability to make improvement in one of the major contributors to profit.

A visit to Sam and Jodie Martin’s Southcote Shorthorn Stud, Walcha, provides somewhat of a contrast to David. Sam is one of the younger generation of breeders and doesn’t have the same length of experience, but he still sees EBVs and indexes as important to his selection program.

Sam likes blending science with subjective assessment when planning his breeding operation and enjoys seeing the results of the plans as functional and fertile animals.  Paramount for Sam is structural soundness, but he sees the EBVs and indexes as a way to minimise the guess work for some of the more important traits.

The Southcote bull catalogue has some of the highest indexing bulls in the Shorthorn breed, and Sam is proud to point that out to clients and help the buyers to make better use of figures.

He thinks that more bull buyers are using EBVs and indexes when selecting new sires.

‘For 80 percent of our clients, EBVs and indexes are the first thing they look at,” Sam said.  They come to our sale with their catalogue already marked with the bulls that have the EBV profile that suits their objective,” he said.

Sam Martin with breeders on his Southcote Shorthorn Stud, Walcha

Stud stock agent Nick Hall of Elders Walcha has been selling and buying bulls on behalf of clients for some years, and sees the full spectrum. He thinks that the use of figures is definitely increasing, but would like to see a uniform system across all breeds, plus the use of the raw data to help make the best decisions possible.

Nick has visited a number of client herds during Beef Week recently and is keen to point out that despite the poor seasonal conditions there are some very good bulls available, many with good figures. He thinks this year is will be a great year to pick up value for money, from the sales seen thus far when selecting new bulls.

Selection for extreme growth

Thanks to Steve Taylor for his comment on last week’s genetics column re his concern over selection for extreme growth.

Indexes are the best way to balance selection, and as long as the weightings on traits is appropriate, ‘extremes’ for any trait should not result, research shows.

When the index has appropriate weighting on calving ease and fertility, plus the cost of mature weight, then growth rate will be moderated.

Next week we will examine selection for fertility in more detail, but in most environments, fertility is the best monitor of what the ‘right cow size’ is.

NFI/fertility relationship

Net Feed Intake (NFI) has been talked about for many years and improvement in feed efficiency is an obvious benefit to the industry – but there are still some unknowns with NFI.

Of greatest concern is the relationship between NFI and female fertility. There are some suggestions that as NFI improves, fertility may be adversely affected.

Roger Zuill (see last week’s column) and David Murray are both quite convinced that selection for improved feed efficiency is important for industry improvement, but if there is a negative association between NFI and fertility, then the overall change may not be positive.

Brad Walmsley

Dr Brad Walmsley of the Animal Genetics and Breeding Unit (AGBU) says that if NFI is used in an index in conjunction with days-to-calving, both traits can be pushed in the right direction.

Dr Walmsley looks after the development and maintenance of Indexes in Breedplan and has done preliminary studies on indexes that incorporate NFI. He is confident that indexes will balance the selection for both traits, but warns that selection for NFI independently could cause problems, just as in any single trait selection.

To date no breed society has included NFI in their indexes but some pastoral company indexes have been using NFI for some years.

 

  • Guest author, Wayne Upton, is writing our Weekly Genetics Reviews for the next six weeks, while Alex McDonald is on holiday.

 



Reader's Comments


Comment
  • Don Nicol July 3, 2018

    If you are not buying bulls in the top 50per cent of the breed; good luck with your hobby!

  • Paul D. Butler July 4, 2018

    Selection for “feed efficiency” is of great importance for an improved cowherd. Selection should be for “grass conversion efficiency” via the correct selection criteria………..other than NFI and the wrong selection methods.

  • S Weichardt July 4, 2018

    Dear sir,
    To rely on figures on a piece of paper to determine your bull choices has me in disbelief.
    I’ve been breeding cattle for over fifty years and never have and will never will purchase bulls on dodgie figures somebody shows me. I get sick and tired of hearing bull breeders say that a particular animal is in the top 1% of bulls for weight, milk or whatever
    Most big studs wean bulls at 4 to 5 months then heavily feed these animals on crops, grain and the like. These bulls then get weighed at 300 days (usual weaning time) and show these huge weight for a calf of 9 months, then all of a sudden these calves gets a plus for milk, weight gain and whatever extra dollars you like, a system totally unrealistic to our grass fed regimes.
    When you look at the huge weaner sales that happen across this great country ever years 90% or better are grass fed.
    I look at bulls I produce here, out of 180 cows I will keep around 30 and then gradually reduce this to 3 or 4 bulls, all are weaned off mum at eight to nine months totally grass fed and must be no less than 450 kilo’s at weaning. On your figures these bulls would be in the bottom 1% of bulls, but exactly true to a system that the vast majority of cattle producers do in this country.
    I go to many bull sales and see figures in catalogues that spin your head and then on visual viewing I see shockers, just remember David (or whoever) the best stud men have the sharpest knives.
    I can go on and on with this matter, how showing figures has distorted the cattle industry.
    Stefan

  • Catriona Millen (Southern Beef Technology Services) July 4, 2018

    Great article, Wayne. Was interested to see how David Murray has been publishing the percentile band values underneath his EBVs in his sale catalogue. I have also noticed a number of producers starting to publish the EBV Percentile Graph in their sale catalogues (visual representation of percentile bands). The next edition of the SBTS & TBTS Update magazine will feature an article on using the EBV Percentile Graphs in sale catalogues, with two New Zealand based herds sharing their experiences of doing this.

  • Peter Vincent July 4, 2018

    Stefan, you are correct, figures have distorted the cattle industry and most breeders are very thankful for the distortion. We can now identify the truly profitable sires and dams in our herds rather than point to the fat old girl which won a prize for walking in circles.

  • Steve Chase July 5, 2018

    Stefan. Congratulations on breeding for over 50years it looks like you haven’t changed a bit in that time and that you have a complete understanding of how Breedplan works.

  • Alice Greenup July 5, 2018

    Let’s be mindful that one shoe does not fill all.
    “Not everything that can be counted, counts. And not everything that counts can be counted” Albert Einstein
    Interesting to note, that we have some very astute clients that have decided that they prefer bulls with average growth. That is because of concerns for maintenance requirements for females and that the genetics express optimum growth and weight for age, therefore enabling emphasis on other traits that are highly correlated to productivity and profit.

  • James laurie July 6, 2018

    Whilst I agree with the sentiment that you need to be using bulls in the top half of your breed – I also agree with Alice’s comment. In the Angus breed if you select on Indexes you can promote extremes – the linear model assumes the higher you get in some traits the better, but as Alice points out, more is not always better. I would also like to have some of Stefan’s grass – with his weaners no less than 450 kgs at 8-9 months! Suggest he should make it a business and run a lot more cows.

  • Steve Chase July 6, 2018

    Congratulations Stefan
    On you 50 years of breeding.
    It seems like you haven’t changed a bit in that time.
    It also appears you have a thorough understanding of how Breedplan works

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