E-Newsletter: July 30, 2021

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E-Newsletter 2021 drought-stressed crop dsfsfa grazing can be toxic … Nitrates! An update from MBP July 30, 2021

mbbeef.ca

By: Ray Bittner, Livestock Predation Lead

With the extreme dryness experienced by many Manitoba farmers in 2021 there is a temptation to cut costs and utilize drought-damaged crops by grazing. While grazing is the cheapest form of harvest, caution should be taken before releasing the cows. Annual crops and certain weeds which have wilted or started drying off above ground can have devastating levels of nitrates in the stem which will be ingested by grazing cows.

lethal because the stomach bacteria don’t grow accustomed to the higher levels of nitrates. Generally less than 0.5% N03 nitrate is considered safe or usable, but with drought damaged crop levels of 3.0 and greater have been detected this year. Harvesting as dry hay or silage and strategically feeding in winter time as a small part of the animal’s ration might be the only way to save this valuable feed, and using it in a prudent safe way.

Nitrates in crops cause blood to carry less oxygen and can vary from droopy and weak cows to dead cows. It all depends on the level of nitrates consumed and the total amount of nitrates consumed.

Most years nitrates due to dryness is not a problem but 2021 dryness is indeed causing some of these high levels so you should test your nitrate levels prior to grazing or harvest.

Where the greatest problem arises is with beef cows which are hungry and are allowed access to a crop field. The crop field may be stunted and the plants small, but it is an absolute all-you-can-eat buffet for the first hours and days. That influx of feed and accordingly nitrates can be

For more information you can find a factsheet at the following location: https://www.manitoba.ca/agriculture/livestock/beef/nitratepoisoning.html

See pages 3-9

DROUGHT INFORMATION

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