The most dominant roundworm in South Africa’s summer rainfall areas is Haemonchus contortus. Known as wireworm (haarwurm) in South Africa and barber’s pole worm elsewhere, it is a blood-sucking parasite that targets sheep and goats, and can cause substantial blood loss in affected animals. It is particularly rife from February to May.
According to Nico Grobler, who keeps a 300- head Meatmaster flock near Ventersdorp in North West, wireworm can seriously threaten the long-term sustainability of a sheep flock and is the greatest hazard to sheep farming in his area.
“My objective is eventually to eradicate all animals in the flock that need treatment for wireworm. To that effect, I only use rams that have never been dosed for wireworm,” he says.
Grobler and his team use the FAMACHA system to evaluate the animal’s anaemia level and thereby the extent of wireworm infestation and whether or not treatment is required. This is done by comparing the colour of the mucus membrane on the sheep’s lower inner eyelid with the colours on a standardised ‘eye score’ card.
TO CULL OR NOT TO CULL?
Very few of the ewes that need to be treated for the parasite are allowed to remain in Grobler’s flock, while rams needing treatment are culled without exception. The ewes are weighed and monitored monthly according to the FAMACHA system. The decision of whether or not to cull is based on the infected animal’s genetic merit and the value of the contribution she makes to the stud.
A variety of products are used to treat infected animals to prevent the development of resistance.
Grobler says he simply cannot afford any animal that threatens the health status of the flock.
この記事は Farmer's Weekly の December 04, 2020 版に掲載されています。
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この記事は Farmer's Weekly の December 04, 2020 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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