Here's why:
* Milk production is cyclical: A cat's body doesn't produce milk on demand right after a meal. It works in cycles, similar to a human mother's breast milk production. The milk production is triggered by hormones related to pregnancy and nursing.
* Nursing stimulates production: The most significant factor is nursing by the kittens. Suckling sends a signal to the cat's brain to release hormones that stimulate milk production.
* Nutrition is key: A well-nourished cat will be able to produce more milk.
Therefore, a cat doesn't necessarily produce milk immediately after feeding. The time frame for milk production is more dependent on the nursing frequency and the cat's overall health and nutrition.
If you're concerned about a mother cat's milk production, it's best to consult a veterinarian. They can assess the cat's health and advise on how to ensure adequate milk supply for her kittens.