Dry cat food can indeed go bad after opening. While the appearance of the kibble may not change dramatically, the quality and nutritional value of the food can degrade over time. The main concern is the oxidation and rancidity that can occur in the fats and oils present in the kibble.
When a bag of dry cat food is opened, exposure to air and moisture can lead to oxidation of the fats in the food. This oxidation process is accelerated by heat, light, and humidity. As the fats oxidize, they can become rancid, resulting in a noticeable change in smell and taste. Rancid fats are not only unappetizing for cats but can also be harmful to their health.
Oxidation of fats in dry cat food can occur relatively quickly, especially if the kibble is not stored properly. According to Steve Brown, an expert in pet food formulation, kibble can start to go rancid after just 14 days. This timeline may vary depending on the specific formulation of the cat food, storage conditions, and the initial quality of the ingredients used. However, it is generally recommended to use up an opened bag of dry cat food within a month to ensure the best quality and freshness.
To delay the oxidation process and maintain the freshness of dry cat food, proper storage is crucial. It is best to store dry cat food in a cool, dry place, away from direct sunlight and sources of heat. The food should be kept in its original packaging or transferred to an airtight container to minimize exposure to air and moisture.
In addition to the risk of oxidation and rancidity, an opened bag of dry cat food can also be susceptible to contamination by pests such as insects or rodents. Therefore, it is important to inspect the food for any signs of infestation and discard it if necessary.
Dry cat food can go bad after opening due to the oxidation and rancidity of the fats in the kibble. It is recommended to use up an opened bag of dry cat food within a month and store it properly to maintain its freshness and nutritional value. Regularly monitoring the food for signs of spoilage and pests is also important to ensure the health and well-being of your feline companion.