Genetics

Weekly genetics review: Quantifying the impact of hybrid vigour

Genetics editor Alastair Rayner, February 19, 2019

 

THE role crossbreeding plays in increasing productivity on farm is well established.

Most breeds in Australia are well placed to offer the advantages of utilising their breeds in capturing hybrid vigour and enhanced productivity.

The advantages of hybrid vigour have been well proven in many research trials domestically and internationally.  In turn, many commercial operations have designed their breeding programs around crossbreeding strategies in order to improve their herd productivity in one or multiple areas.

Placing an actual value on a crossbreeding program has been slightly more nebulous.  Obtaining sufficient data requires large-scale breeding programs where cattle can be run in a common environment, managed to the same standards and taken through to slaughter.  This has been a restriction of some trials in the past.

Over the past three years Herefords Australia in conjunction with MLA, the University of Adelaide and Tasmania’s Musselroe Beef have been conducting a large-scale breeding program to quantify the impact that crossbreeding offers commercial producers.

As reported in Beef Central at the start of the trial back in 2015, the trial commenced with around 600 Angus females being Artificially Inseminated to 11 leading Hereford Sires and four leading Angus sires.  Progeny were grass finished and processed in Tasmania.  The program will conclude in December 2019.

The trial replicates similar large-scale trials conducted in the US, where the value of the black baldy animal is highly regarded. The preliminary Australian results provided by Herefords Australia reveal some useful themes for commercial cattle producers.

Overall the project joined 40 percent of the animals to two-year-old heifers, while the remaining 60pc were three and four year old cows. As expected, there were measurable increases in crossbred weaning weights as opposed to straight bred calves.

Data analysis

Initial results offered by Herefords Australia suggest the increase is around 3pc in heifers calves and up to 9pc in the more mature breeders.

Wayne Pitchford

Data analysis by Professor Wayne Pitchford of Adelaide University has looked deeper at these results. His study reveals that sire breed differences were not significant for calving ease or calf survival among heifers and mature cows.

As other research has indicated, crossbred calves are heavier at birth, with the data showing that the Hereford-sired black baldy calves were 6pc heavier at birth.

In terms of calving ease, particularly in the heifer portion, assistance in calving increased with bull calves by about 5pc.  There was no significant difference in calving ease among the sires when the calf was a heifer.

With final analysis of growth and carcase data still to be released, the messages for industry at this stage is focus on the impact crossbreeding offers in weaning weight and managing calving.

Traditional approaches to crossbreeding often recommended that heifers be joined to sires of their own breeds to minimise the requirement to assist in calving and reduce calving risks. The data from this trial suggests that the increase assistance required in joining a sire from another breed – when joining British breed with British breed – may be lower than previously considered.

“As an example, if a commercial Angus herd of 100 cows had 20 heifers and 80 mature cows calving, use of Hereford bulls would mean assisting in only an additional three calves, but get the production of an extra 1600kg of weaning weight,’’ Professor Pitchford said.

With further releases planned throughout 2019, additional data from the trial will become available to the industry, including female reproductive traits and carcase data.

In line with the release of these trial results, Herefords Australia plans to roll out workshops on the economic benefits of black baldy crossbreeding programs during 2019.

While this trial may confirm the experiences of many committed crossbreeders across Australia, the inclusion of fertility, growth and carcase traits will offer an opportunity to benchmark their own performances against current industry findings.

It also reinforces the importance of selecting performance-recorded sires for use in a crossbreeding program, rather than relying on unproven or non-recorded genetics within a herd.

 

 

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Comments

  1. Warren and Jane Coates, May 19, 2019

    I have been Cross breeding Angus (sires) with Poll Herefords (Females) for 10 years and I found them to be very good mothers and did better than average through dry periods . I am now using my Black Boldy cows as recipients and using embroys (Speckle Park) . . I started in 2018 and had my first birthing of the Speckle Park, I am finding Black Boldy’s to BE VERY GOOD MOTHERS.
    I would like to learn more and obtain more information on the research that is going on with Poll Herefords/Angus cross breeding – Black Boldy’s. I am finding that Black Boldy cows (Angus over the Black Boldy’s) Black Baldy’s are reverting back after four years to be looking like Angus. Would it help to put a Poll Hereford bull over the black Boldy’s for the next season. We need to have a program in place to ensure our Black Boldy hefiers femals do not revert back to Angus. Thank you. I Look forward to your assistances…

  2. Alice Jacqueline Greenup, February 21, 2019

    Cross breeding or Bastardisation?
    Its depends on your starting point. Hybrid vigour is above mid-parent values. Therein lies the risk and opportunity. So using a lower genetic base (for the point of breed variation) may give hybrid vigour, but possibly at a lower place than would have existed with a straight bred herd. Interbreed EBVs would ensure that we were using parents of equal and superior merit. Then the hybrid vigour would then be in addition to the permanent and cumulative genetic gain already being made with objective measurements.

  3. Marcus Richardson, February 21, 2019

    I think it’s great such a trial is taking place to quantify objectivity the differences in a XB system. Does the trial look at any additional cost that may result in a larger mature cow? Look forward to the end results.

  4. Daryl Jenkins, February 20, 2019

    The value of crossbreeding is well documented, however if this is to be successful a number of factors need to be taken into account. It is very important to select animals that are appropriate to the environment and end product that is to be produced. While characteristics such as growth rate, calving ease and so forth are covered by systems such as Breedplan the actual maturity pattern of the animals can have a very big influence on their suitability for different production systems. Comparison of young grass fed to feedlot finishing or grass fed bullock production will show the range of maturity patterns that are appropriate. In practice maturity pattern is a very subjective and misused term. The difference between 400 day weight and 600 day weight in Breedplan can give an indication of maturity pattern variations.
    In my experience if the appropriate Angus and Hereford are used in a crossbreeding programme the resultant progeny have a lot going for them. The next step is to introduce an appropriate Charolais or Simental (or some other distantly related breed) in a 3 way cross for outstanding results. I stress that it is not a matter of the cattle being good or bad but being appropriate for the task.
    The big draw backs with all cross breeding systems is the ability to source replacement females, have the ability to identify appropriate sires and be able to manage a cross breeding system.

  5. Cross breeding is best used when complimentary breeds are joined. Hereford x Angus are not the best example of the advantages of cross breeding to gain hybrid vigor. If other breeds/composites were incorporated the true benefits could be shown. Conflicted interests?

  6. John Friend., February 19, 2019

    I have been watching this Trial with Great interest. I personally believe this will be a huge step forward for Beef Production in Australia, both Grass fed and Grain Finishing.
    Cross Breeding such as this will enable tougher areas for production of Straight bred Angus now accessible by Crosses, with Hereford. When you see how Hereford do in Marginal Areas Can know be complimented by Angus Cross Breeding. In my Opinion.

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