It's a good all round tonic for hens etc. It also stops the waterers from turing green as quick if left outside. I use a few drops in the young ones waterers from birth. For the main pens i use aprox a tablespoon or so in 5 litres of water. I just change it out whenever their waterers need redoing usually every 2 days or so. You use acv to pickle quail eggs? Eww... lol I am not to keen on the idea of pickled eggs though i do love a pickled onion lol. Infact i pickle quite a bit of stuff but i use brown vinegar and herbs and garlic normally. I did some pickled capsicum the other day and i have home made beetroot in jars .