Would never be without it, my pigeon had young bird sickness last thursday, different birds after the first 24 hours in my opinion after 48 hours every bird was back to full health. My old man used xerex, before last saturdays race, for 3 days, 1st,2nd and 3rd club, 1st 2nd and 3rd federation. This isn't the first time we have been in this situation after using this product. Have often thought about using it on a weekly basis, but have never done so, as they have always flown well after the initial treatment. Its the one thing i wouldnt be without and i buy it in bulk from Blackpool, same can be said for my old man. Bill has many stories of this great product one of them that i always remember is about a fancier in south africa maybe bill can tell the story. The product is the best out there for the young bird sickness purpose, but you also need good management and good pigeons, just giving it isn't going to give you miracle racing results, but if your bird have young bird sickness it defiantly will get rid of it and get rid of it FAST.