The A1 protein is much less prevalent in milk from Jersey, Guernsey, and most Asian and African cow breeds, where, instead, the A2 protein predominates. To evaluate the volume of milk the baby is getting at each feed. To encourage your let down prior to pumping you could try: Looking at a photo or thinking of your baby.
Still others will find themselves needing to express on a regular basis. They would take 40 cans, one per person she said.