I've never heard/read that poultry was lactose intolerant before.. lol, I know mine definitely aren't. Lots of poultry keepers/breeders feed their birds yogurt on a regular basis as a treat and/or as "digestive maintenance", some just use it after worming, or a round of antibiotics to help rebuild/re-balance the population of the beneficial microbes that get knocked down by the antibiotics or wormer. Probiotics that you can buy from feed/pet supply stores in powder form or in a tube are the same thing, live beneficial microbes. (Yogurt's cheaper tho and the birds think they are just getting some extra yummies!).
 
All my Guineas and Peas gobble up yogurt (and sling it everywhere, lol). I only feed them plain yogurt tho, nothing flavored or sweetened cuz they don't need the sugar. Sometimes I'll add diced bananas and grapes to it or mix in some plain cooked oatmeal, but either way they will scarf it down, they are pigs, lol.