Breeding burpless bovines

08 Apr, 2019 03:58 PM
Comments
0
 
Caeli Richardson is researching better ways to measure methane production in cows.
There is a need to explore long-term solutions to reduce livestock emissions ...
Caeli Richardson is researching better ways to measure methane production in cows.

This is the winning entry in the Australian Dairy Conference's Young Dairy Scientist Award.

Cows that burp less could help save the environment and put money back into the pockets of farmers. With the increasing cost of feed and social awareness of climate change, dairy farmers are under greater pressure to produce more milk with less resources. There is a need to explore long-term solutions to reduce livestock emissions and improve overall on-farm efficiency. Researchers at Agriculture Victoria are investigating the opportunity to use genetics to breed for cows that produce less methane and efficiently convert feed to milk.

A cow produces 70-120 kilograms of methane per year. The environmental equivalent of driving a car 11,951 kilometres. Approximately 90 per cent of the methane is created as a by-product of feed fermentation.

The cow rumen is filled with a variety of microbes that breakdown plant material into particles the cow can use as energy. Through this process, the microbes generate methane which is then burped out. The amount of methane created greatly depends on the population of microbes in the rumen, and that is determined by the cow’s genetics.

Methane production in cattle also has a strong link to feed efficiency. The feed-energy that goes towards generating methane could be used more economically for milk production.

In a group of cows that eat the same amount of feed and produce the same amount of milk, there will be some cows that release more methane and some cows that release less.

Almost 15pc of feed-energy goes towards methane, but there is variation. The challenge is to identify the animals that produce less methane and use them to breed the next generation of dairy cows. Selecting cows for lower methane is also selecting for improved efficiency.

Dairy farmers have already begun to breed for more efficient cows by choosing to breed animals with high breeding values for FeedSaved, a trait released by DataGene in 2015 that identifies the most feed efficient cows.

Farmers currently use breeding values to rank animals in their herds on a genetic basis. To generate breeding values, the animal’s DNA is associated with their physical characteristics, in this case methane. This genetic tool predicts which bulls or cows will breed the best offspring.

However, breeding values for methane are not currently available anywhere in the world. The gold standard of measuring methane is expensive and labour intensive, which leads to small datasets. Although measurements in these small groups are extremely accurate, the breeding values produced are unreliable and cannot be used in industry application.

Generating methane breeding values is still a work in progress, but results are promising for a cost-effective and reliable approach. To combat the data size problem, researchers are looking at new ways to collect methane data that is cheaper and easily obtained.

One strategy uses midinfrared (MIR) spectroscopy to analyse milk samples collected at routine herd testing. A light is beamed through the milk sample and based on how the light interacts with the molecules in the milk a pattern is produced that is unique to each cow, similar to a signature.

The individualised pattern can then be used to predict a cow’s methane production. By taking advantage of this technique, researchers can obtain large datasets with many animals.

Results show that breeding values generated using the large MIR methane dataset are three times more reliable than those calculated using the precise gold standard dataset, which has much fewer animals.

The real test will come when breeding values are calculated by combining the gold standard and MIR methane measurements, which is standard industry practice. If the increase in reliability is high enough, a trait will be available that would have otherwise been too expensive to be included in routine genetic evaluations.

The strategy of using MIR does not replace conventional methods of developing breeding values. Instead, it allows breeding values to be developed for challenging traits that would otherwise have very low reliabilities.

MIR is a tool that can be used to scale up datasets size, but it is still a rough prediction. To ensure the most efficient animals are consistently selected, it is imperative that gold standard methane data is collected to prove that it works.

MIR is an inexpensive way to make breeding values more reliable. MIR is already used for routine traits like fat and protein per cent. Obtaining measurements for methane is a simple recycling of the collected samples. However, the MIR methane measurements are crude compared to the gold standard method.

But how crude can measurements be and still provide valuable information for farmers? Hopefully with the help of funding agencies, researchers and farmers, this is a question researchers will be able to answer in the near future.

This research is part of a larger DairyBio project funded by Dairy Australia, The Gardiner Foundation and Agriculture Victoria, led by Dr Jennie Pryce. As a PhD candidate, Ms Richardson is currently completing the first year of her program while working on this project and is looking forward to her contribution to the Australian dairy industry in the following years of her program.

The six finalists were:

  • Caelie Richardson, Latrobe University (Vic).

    Read her article on Breeding burpless bovines

  • Teanna Cahill, Murdoch University (WA).

    Read her article on What mastitis bugs grow on your farm?

  • Patricia Colusso, University of Western Sydney (NSW).

    Read her article on Learning of a virtual fence by cows

  • Juan Guragilo, University of Sydney (NSW).
  • Read his article on Larger and tech-savvy farms

  • Chaya Smith, Latrobe University (Vic).

    Read her article on Improving perennial ryegrass quality

  • Felicity Searle, Murdoch University (WA).

    Read her article on Getting more bucks per bang

  • POST A COMMENT


    Screen name *
    Email address *
    Remember me?
    Comment *
     
    Fertigation is the injection of fertilisers, soil amendments and other water-soluble products through an irrigation system. 
16 Apr 19 Fertigation is the injection of fertilisers, soil amendments and other water-soluble products through an irrigation...
    A fertigation trial in south-east Queensland for the past two years has shown it produces more pasture and cuts labour and fuel costs.
16 Apr 19 A fertigation trial in south-east Queensland for the past two years has shown it produces more pasture and cuts...
    light grey arrow
    This project was doomed from the start. Sri Lanka's Department of Animal Production and Health
    light grey arrow
    What an awesome article, this will save so much time and money for farmers across the world with
    light grey arrow
    The $1 a litre milk has already forced closure of numerous dairy farms. Lion Dairy & Drinks
    An industry survey revealed that farmers milking larger herds have adopted more precision technologies, and that is expected that by 2025 the adoption of technologies for data capturing and monitoring system parameters will increase.
08 Apr 19 An industry survey revealed that farmers milking larger herds have adopted more precision technologies, and that is...
    Virtual fencing (VF) technology has great potential to alleviate the costs, time and labour devoted to the establishment and maintenance of traditional physical fences.
08 Apr 19 Virtual fencing (VF) technology has great potential to alleviate the costs, time and labour devoted to the...
    Australian farm chemical manufacturer Nufarm has repaired its balance sheet and is now hunting for acquisition opportunities.25 Sep 16 Australian farm chemical manufacturer Nufarm has repaired its balance sheet and is now hunting for acquisition...
    Monopoly market may confront cropping sector under mega-merger proposal.22 Sep 16 Monopoly market may confront cropping sector under mega-merger proposal.