Wool quality reduced with sheep weight loss

Apr 30, 2014 by Aaron Bryans
The findings add to prior knowledge that seasonal weight loss can cause a decrease in wool fibre diameter. Credit: Nikol Lohr

A new study into wool production has found that seasonal weight loss can cause reduced wearability and appearance retention.

The study, involving 24 Australian Merino sheep, found the 12 that experienced experimentally induced had significant increases in KAP13.1 and KAP6 proteins that cause reduced wearability and appearance retention in fibres.

Co-author Dr Andre Almeida believes their findings will cause wool producers to rethink their sheep selection programs.

"The fact that the most significant wool production players in the world (namely Australia but also the Iberian Peninsula) are located in drought prone areas, made this issue extremely interesting," he says.

"[Seasonal weight loss] causes important changes in the wool structure and a negative impact on wool quality and technological properties.

"This is important information for farmers and industry that can do a better balance of their supplementation programs."

Australia constantly undergoes extreme seasonal fluctuation, with October to December being a severe dry period that affects nutrition and pasture.

This has resulted in many wool producers turning to supplementation to maintain wool production; however it is an expensive and difficult process that is unavailable in resource-limited countries.

The study, featuring WA scientists Professor John Milton, Dr Chris Oldham, Dr Tim Scanlon and Tanya Kilminster, is the first to analyse the effects of seasonal weight loss at a proteomic level.

"We realised that [there was] no information available on the effect of weight loss on wool production and, above all, wool quality," Dr Almeida says.

The findings add to prior knowledge that seasonal weight loss can cause a decrease in wool fibre diameter.

Finer wool is favoured in the wool industry as it provides a reduced prickle sensation but is expensive for customers due to its lower production output per sheep.

"Ultimately this information can, on the long run, be used in [sheep] selection programs in order to obtain animals that are more capable of coping with the most serious drawback to animal production in the tropics and subtropics seasonal weight loss," says Dr Almeida.

Dr Almeida and his team are also examining different breeds of sheep to understand how each breed copes with seasonal weight loss in an attempt to understand key metabolic pathways and characteristics.

Explore further: Genetic link holds key for sheep affliction

add to favorites email to friend print save as pdf

Related Stories

Sheep wool growth boosted by reducing cortisol

Oct 22, 2013

University of Adelaide researchers have shown that sheep wool growth can be significantly boosted by manipulating the stress hormone, cortisol, in their pregnant mothers.

Genetic link holds key for sheep affliction

Apr 08, 2014

New research shows WA farmers may soon be able to breed sheep with high natural resistance to breech strike, as part of a nationwide study to identify the traits of animals able to withstand the problem.

Fears of Japanese aggression in wool trade

Jul 25, 2013

A Murdoch University researcher has uncovered a little known nugget of Australian history about a Japanese push to challenge the nation's wool dominance in the early 20th century.

Valuable, eco-friendly Norwegian wool

Dec 06, 2013

Wool production in Norway has been documented to be more environmentally sound than in other countries. From Norwegian wool, a wide variety of pure, safe materials can be made for use in clothing, textiles, ...

Recommended for you

Amazonian shrimps: An underwater world still unknown

1 hour ago

A study reveals how little we know about the Amazonian diversity. Aiming to resolve a scientific debate about the validity of two species of freshwater shrimp described in the first half of the last century, ...

Factors that drive sexual traits

2 hours ago

Many male animals have multiple displays and behaviours to attract females; and often the larger or greater the better.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.