SDSU Extension Dairy Field Specialist
As a result of increased demand for dry whey used in human foods such as sports drinks & protein supplements calf milk replacer prices continue to climb. Thus, it is essential to properly store milk replacer so that it retains its quality until its use, especially when buying in bulk quantities.
Spring, summer and fall typically mean higher humidity and fluctuating temperatures in the Upper Midwest. Milk replacer stored in areas without controlled temperature and humidity may absorb moisture causing condensation and clumps in the product. These clumps can cause numerous problems such as increased spoilage, fat oxidation (impacting the smell and taste of the milk replacer), it also creates difficulty in handling the product when measuring, mixing, and reconstituting it.
The product should be stored in an area that is between 41°F (5°C) to 68°F (20°C) and equal or less than 60 percent humidity (Grober Nutrition Inc., 2011). A walk-in cooler would work well to store this valuable product. To maximize its freshness one should rotate the milk replacer stock by following the rule of “first in, first out”. The average recommended shelf life of milk replacers is approximately six months under ideal storage conditions. Other considerations for storage include (Grober Nutrition Inc., 2011):
• Keeping it away from high humidity places such as your water source or sink/mixing area.
• Do not store in the calf barns as calves generate heat & moisture.
• It is essential to minimize its exposure to pests such as mice, rats, cats, birds, etc. Close any opened bag when you are not using it.
• Using an air tight container such as a tote to store opened bags in-between uses helps minimize exposure to humidity and pests.
• Reduce product compaction by not piling more than two pallets high.
All bags should be inspected before use for color and smell. Ideally milk replacer is a light tan color having a pleasant bland odor. However if the powder has a brownish-orange color and a caramelized smell it may have undergone the Maillard Browning reaction (non-enzymatic browning). This reaction occurs due to excessive heat exposure during product storage. As a result product quality and palatability is reduced. If the color is fine but there is an off-smell (such as paint, grass, clay or gasoline) the fat in the product may have become rancid (BAMN, 2008).
In summary, providing a milk replacer that is of high quality, free of contaminants and that has been properly stored will help ensure your calf rearing success.
BAMN, 2008. Bovine Alliance on Management & Nutrition: A guide to calf milk replacers: types, use and quality. AFIA Publications. Arlington, VA. Retrieved from http://nahms.aphis.usda.gov/dairy/
Grober Nutrition, Inc. 2011. Calf GroFacts: Milk Replacer Storage. Retrieved from http://www.grobernutrition.com/milk-replacer-storage/