Christine Navarre | 7/11/2006 11:05:39 PM
Although cattle can survive for days without food, a supply of clean, fresh water is essential to keep animals alive following a disaster. Generally, cattle can survive for a few days without water since they store some water in their rumen. But this water will run out quickly and needs to be replaced to keep animals alive and to prevent digestive problems.
It’s always best to provide free-choice water to cattle, but following a disaster, you may not be able to. Water requirements increase by at least 50 percent in lactating cattle and in hot weather.
Contamination of water supplies can be common following disasters, particularly following flooding of water wells. Water that is potentially contaminated with bacteria can be treated with 2 gallons of unscented liquid household chlorine bleach (5.25 percent) per 100 gallons of water. To disinfect water wells, pour 4 gallons of a chlorine bleach solution (1 gallon of household bleach and 3 gallons clean water) into the well. Open all faucets and let water run until chlorine is smelled. Then let the system sit for 24 hours. If contamination of water by toxins is possible, it should be avoided until tested.
Flooding of coastal areas caused by a hurricane storm surge can contaminate water supplies with salt. Calves are more susceptible to salt toxicity. Lactation, hot weather and exertion increase water intake and make adult animals more susceptible to salt toxicity.
Total Soluble Salts Content of Water
(ppm = parts per million)
If cattle have been drinking water with dangerous levels of salt, it is best to slowly transition cattle to fresh water. Supplying small amounts frequently is best. Try to ensure that no cows are overdrinking or limiting others access to fresh water.
Rules of thumb for calculating necessary trough space:
Based on these figures and using some geometric equations, you can closely estimate the amount of water you are providing for livestock.
To figure how much water a trough can hold, use the following examples based on the shape of your water trough:
In this example, the radius (half the diameter) of the water trough is 48 inches and the depth of the trough is 24 inches. Use this formula:
Circle = π x radius2 x depth = gallons
Water trough = 3.14 x (48 x 48) x 24 = 751 gallons
You also can calculate the amount of gallons by inch of depth in the tank. For example:
751 gal = 33.3 gallons per inch
Rectangle = length x width x height = gallons
This rectangular water trough is 84 inches long, 36 inches wide and 24 inches deep. Thus, in this example:
Water trough = 84 x 36 x 24 = 314 gallons