Print this page
Friday, 04 May 2018 09:55

Good autumn may lead to increased worm burden

Written by  Nigel Malthus
Paul McKee says a good preventative worm programme is critical to ensure worm infections are kept under control. Paul McKee says a good preventative worm programme is critical to ensure worm infections are kept under control.

Good Autumn growth sets the scene for maximum growth rates in beef cattle post-weaning, but beware worms in pasture, warns Paul McKee, an animal health technical manager at Ravensdown.

Left uncontrolled, seasonal worm peaks can reduce animal health and performance and rob farms of their productivity gains, McKee says. Energetic prevention is a must to keep worm infections under control. 

With worms increasingly resisting drenches – especially the single active endectocides – worm control efforts must be effective and sustainable, McKee says.

Ravensdown recommends faecal egg count reduction tests (FECRTs) in which a mob is left undrenched until egg counts reach a moderate level, then divided into groups. Each group is then given different drenches and faecal samples are taken over the following 10 days to determine different treatments’ effectiveness.

Although FECRTs are considered expensive by some, the cost can be offset by drenching less often with effective combinations of drenches, McKee says.

Post-drench faecal egg counts and larval cultures will help determine if there is a need to change treatment plans.

Double or even triple combination drenches should be used if possible, he said.

“It’s harder for worms to survive triple drugs than it is to survive one drug at a time.”

However, McKee adds that it’s getting late in the season for testing drench combinations, since parasites mainly affect young stock, and testing on older stock better able to handle parasites can make an ineffective drench look better than it is.

Meanwhile, Ravensdown recommends specific management practices to help kill parasites:

• Avoid grazing young cattle intensively on short pasture with high numbers of larvae or on pasture grazed 1-2 months previously

• Use older cattle to clean up pasture where young cattle have been grazing

• Cross graze with sheep to reduce pasture larvae levels

• Lift farm fertility to grow better quality forage for stock

• Use crops and new grass paddocks to provide low larval challenges at times when larval challenge is high on established pastures

• Feed animals well to increase their ability to deal with worm challenges.

 

» Connect with Rural News

More like this

Getting spring pasture covers right

Managing pasture surpluses or deficits in spring is the key to maintaining quality and persistence going into summer, says Ravensdown agronomist Tim Russell.

Small things make a big difference

Lamb daily growth rates on sheep farms in New Zealand are in a huge range — from as low as 80g to 350g or more per lamb per day. 

Getting to the top of this range requires attention to detail.

Feed stock properly

In this season we are again asking a lot of our stock, writes Julie Wagner, Ravensdown animal health product manager.

» The RNG Weather Report

Featured

New hort science scholarships 

A scholarship for up to five students each year, studying Massey University’s Bachelor of Horticultural Science degree has been launched by kiwifruit exporter Zezpri.

 

Taking farmers together on climate change

How we take the farming community with us and what trajectory we are on for climate change response is all open for discussion, says Dr Rod Carr, the new chair-designate of the Climate Change Commission.

High alert for stink bugs

Biosecurity Minister Damien O’Connor is warning travelling Kiwis to be vigilant as the high-season for the crop-eating brown marmorated stink bug (BMSB) is under way.