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Is your dad an experienced poultry man? I've had exotic birds and poultry for 39 of my 43 years. I've studied poultry and exotic bird nutrition thoroughly for the last 10 years. I have hands-on experience with yogurt in both situations. I suggested yogurt as it's not usual that a person will seek out and pay for an avian specific probiotic. They are available, and they are definitely not as easy to find as plain yogurt.
It's true that birds are not generally very lactose tolerant. However, poultry have been raised for decades using milk products that contain lactobacilli. These products were even recommended in textbooks of the day. I have them - in my home - and can reference as many of the texts as you wish.
The lactobacilli in the yogurt (plain) help to decrease the amount of lactose. Given a small amount, birds will thrive -not die - on yogurt.
I've been using yogurt products on my flocks, including the flocks that bred my national champion bird, for over 10 years without one bit of problem.
If you would prefer a different product, try Probios dispersible powder. Or acidophilis capsules from the grocery store.
Whether or not you use the product is up to you. However, if your dad is that well versed in chickens, he might want to recommend a treatment to you. In the mean time, I'm still willing to help. It's your call.