Pigeons Get a Boost from Nano‑Vitamin D

White King pigeons were given water with tiny packets of vitamin D3 to see if it helped them lay better eggs and raise healthier babies. 216 pairs, all three years old, were split into four groups that received either no vitamin D3 or 1, 000, 2, 000, or 4, 000 IU per litre for 13 weeks. The middle dose—2, 000 IU/litre—made the biggest difference. Egg weight and the chance that eggs were fertilised both went up. Hormones linked to reproduction, like luteinising hormone, estradiol and testosterone, rose too. The birds’ bodies also fought damage better: antioxidant enzymes climbed while a harmful marker, malondialdehyde, fell. Their chicks grew stronger and heavier than those from the other groups.The highest dose, 4, 000 IU/litre, did thicken and strengthen the eggshells, but it didn’t improve fertilisation rates and actually slowed chick growth a little. Calcium levels in the blood stayed steady across all groups, showing that the diet already supplied enough calcium. Overall, adding a moderate amount of nano‑encapsulated vitamin D3 to the pigeons’ water helps them produce more and better eggs, keeps their hormones balanced, and supports chick development. Too much vitamin D3, however, can backfire, giving little extra benefit and even slowing growth.