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  • What is Mulesing?

    May 05, 2020 3 min read

    'Mulesing-free' - a few months ago, when I asked on Instagram what you, our lovely readers, look for in a sustainable yarn, that was by far the number one answer. So today we're taking a look at what mulesing-free yarn is, and to do that, we're going to dive headfirst into the world of sheep farming!

    'Mulesing' is the term for a procedure developed by JHW Mules in the 1920s. During this procedure, strips of skin are removed around a lamb's butt, usually when the lamb is between 6 and 10 weeks old.

    Why? Mulesing is one of the ways you can prevent flystrike in sheep - a fatal (if untreated) parasitic infection where fly larvae grow inside a sheep's body and feed of its skin and flesh. As the skin that will eventually cover the wound on the lamb's buttocks will grow significantly less wool than before, feces and urine - both things that attract the blowflies causing flystrike - are a lot less likely to accumulate there. Therefore, mulesed sheep are less susceptible to flystrike. 

    Mulesing has come under a lot of scrutiny as it's often done without anesthetics or painkillers, and observations suggest that in addition to the immediate pain and discomfort, lambs have trouble gaining weight after the procedure.

    The problem of flystrike, however, is still a very real one with fatal consequences for the sheep.

    So are there alternatives to mulesing that help prevent it?

    Breeding programs that work on increasing the number of sheep with less wrinkles - especially in the buttocks area - have shown that so-called 'plain-bodied' (i.e. less wrinkly) sheep are significantly less likely to get flystrike. This obviously takes a long time, though, so while it seems to be the most promising avenue forward, it's not a quick fix!

    A shorter-term alternative is spraying the sheep once per season with dicyclanil, a chemical that prevents blowfly growth on the sheep. This, coupled with more frequent flock inspections, has been shown to keep flystrike rates at the level of mulesed sheep (1). It requires more resources, however, both for the more frequent treating of the sheep as well as for the inspections.

    'Steining' is a third alternative - this describes a procedure during which liquid nitrogen is applied to the buttock's folds of the sheep. The tissue in those wrinkles freezes, effectively killing off all nerve cells, and eventually the wrinkles will fall off, leading to similar result to mulesing: The area around the sheep's butt is covered with less fleece and therefore less susceptible to flystrike. As this method is relatively new - it's been developed towards the end of the 2010s - studies on its effects are not yet available. Observations seem to suggest that lambs recover more quickly from steining than from mulesing and that there's no weight gain issue after this procedure.

    If a yarn is not labeled as 'mulesing-free' does it automatically mean that the sheep have been mulesed?

    mulesing_quote.jpg

    Short answer: No: Longer and more practical answer: No, and you can take a look at the source of the fleeces to rule out mulesing.

    Why is that so? Today, mulesing is - to our knowledge - only practiced in Australia. New Zealand - the only other country that's practiced mulesing in the near past - has banned it as of October 2018. So if the raw fleeces that have been used in your yarn do not come from Australia, chances are that the sheep have not been mulesed.

    If they do come from Australia, though, they might well have been: According to government estimates from 2019 (2), approximately 70% of Merino wool-producing sheep in Australia are mulesed. This also has to do with an interesting development in Australian sheep farming: Historically, Australian Merino sheep - the predominant sheep breed present on the continent - have been bred to have a lot of wrinkles. Why? More wrinkles = more fleece = higher profit per sheep. Unfortunately, though, the more wrinkles a sheep has, the more susceptible it is to flystrike as well.

    What can you do if you're not sure if your yarn is mulesing-free?

    I highly encourage you to contact the yarn company and ask them about it! Before you do that, you can also spend a bit of time on their website - most yarn companies that are working with mulesing-free wool from Australia will have information about that publicly available. If that's not the case, write them and ask!

    Over to you:

    I'd be curious to hear: What are your favorite mulesing-free yarns? Do leave them in the comments down below, I love discovering new-to-me yarns!


    (1) https://www.ncbi.nlm.nih.gov/pubmed/17359305

    (2) https://www.agric.wa.gov.au/livestock-parasites/managing-non-mulesed-sheep


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