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Month: January 2016

Success with Growing Forage Brassicas, Tasmania


Success™ with Forage Brassicas starts with Success Neo.

Success Neo Insecticide from Dow AgroSciences provides control of a wide range of caterpillar insects in many crops.  Reliable control of diamondback moth in forage brassicas gives graziers the potential to again consider this high quality, low cost feed as part of their production system.


Agronomist Dan Sutton from Roberts, Smithton, Tasmania agrees:  “They’ll now be able to grow forage brassicas without fear of losses that have plagued intensive farming.  It crosses over dairy, sheep and beef operations.  A lot of the mixed cropping operations will be able to now consider forage brassicas as part of their farming enterprises, with Success NEO delivering outstanding diamondback moth control.  It’s very effective.”

Forage brassicas can provide quick and abundant feed, with high digestibility, energy, and protein, resulting in excellent livestock weight gains.  Forage brassicas also provide a ‘break’ in the cycle for weeds and disease and can inhibit the growth of disease-producing organisms and reduce the incidence of nematodes.

While producers have long been aware of the benefits of forage brassicas, the major downside has been the risk of large-scale crop damage posed by diamondback moth.  The risk of crop loss is so high in some areas that farmers have turned away from growing forage brassicas and have actively been looking for alternatives. Diamondback moth (DBM) is so prevalent in Australia in spring and summer that it is normal to find larvae (caterpillars) in forage crops such as turnips, rape or Pasja.



Diamondback Moth have become resistant to most of the current chemical options.  Resistance to synthetic pyrethroids and organophosphates is now so widespread as to render these older chemicals ineffective.  Although these chemicals are ineffective on DBM they continue to be used for other pests.  As they are broad spectrum products, they decimate beneficial insect populations, biological control fails and the result is even worse crop damage.

Success Neo Insecticide gives excellent control of DBM, and since it is also selective to the main beneficial insects, it allows them to provide a secondary means of control.  It has a high level of environmental and user safety and defined stockfeed withholding periods make it easy to manage.


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Does Prem Shearing for Drought Lots Pay?

Following a tough spring in many regions, consideration is being given to putting sheep in feedlots in order to preserve improved pastures. One of the issues with feedlots is the loss of style (basically the drop in yield) and usually a drop in staple strength from changes in diet. This article takes a quick look at the effect of selling low yielding, low strength wool versus shearing sheep before putting into a feed lot.

In the example shown below shearing normally takes place in June. In Figure 1 an estimate of per head income and costs (shearing and crutching) are given for 2016 and 2017. Prices were taken for 18-18.5 micron wool from December. For the 2016 shearing it is assumed the wool sold is generally priced as pieces, with a low yield and tensile strength. The (true) extreme story of a broker putting a butt of wool from sheep out of a feed lot following the 2002 drought on the scales, and being overweight, comes to mind. The wool sold in 2017 is assumed to revert to a standard specification, cutting around 3 kg clean per head.

Roberts blog article FIG 1-jan2016

15 years ago the prospect of selling fleece wool at pieces prices meant a hefty discount in the order of 25-30%. In comparison pieces in 2015 generally have been selling for a discount in the order of 8-10%. In this example the wool has been discounted by 8% for the low yield and strength.


Figure 2 shows the income and costs (assuming shearing only) for sheep shorn in January 2016 upon entry to the feedlot, with an adjustment shearing in the following spring and finally a third shearing to bring them into line in June 2017 with the normal program. As the article in November showed there is a only small discount for short stapled wool, so the income from the three shearings is close to that of the two shearing scenario. Cost wise the three shearings (assumed to be $7 per head) outweigh the cost of tow shearings and two crutchings.

The net effect is given in Table 1, with the normal two shearing program coming out in front, despite the 2016 clip being priced as pieces. You can run adjusted scenarios for you own operations, but from a wool quality perspective introducing extra shearings in order to avoid discounts at sale does not stack up.

Table 1: Nett effect of different shearing regimes
Total    Prem Shearing Standard
Kg clean     6.4                     6.4
Income      $85.00                  $86.00 
Costs      $21.00                         $19.00 
Net              $64.00          $67.00 
Source: AWEX, Independent Commodity Services

Key points:

 Wool style (yield) and staple strength deteriorate in drought lots.
 Discounts for wool with low yield and staple strength are minimal by the standards of the past two decades.
 Extra shearings to avoid offering lower yielding/ lower strength wool do not stack up given the current wool market price structure.

What does this mean?

15-20 years ago discounts for low yield and low staple strength were punitive. The strength of the cardings market has reduced discounts for short staple wool and pieces types. This means that spending money in order to preserve wool yields and staple strength, in the face of putting sheep into a drought lot, does not really stack up.

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