Laying an egg asks a cockatiel hen's body to build a shell quickly, and that shell is made largely from calcium drawn from her diet and her bones. Owners therefore talk with an avian vet about which calcium sources to offer during laying season, so the hen can take what she needs as she needs it. The emphasis stays on offering: these are items placed in the cage for her to use freely, not amounts measured out for her.
Offered Sources She Can Take Freely
A cuttlebone fixed within easy reach is the source owners mention first, because a hen can scrape and nibble it whenever she chooses, and a worn cuttlebone shows she is using it. A mineral block serves a similar purpose in a harder form, giving her another texture to work on and a second place in the cage where calcium is available. Crushed oyster shell goes in a separate small dish rather than mixed through her seed, so she can pick the pieces deliberately instead of eating them only by accident, and so you can see whether the level in the dish is actually going down.
Leafy greens bring calcium in food form: offer suitable greens alongside her usual food, washed and fresh, and replace them before they wilt. Having several sources at once matters because hens differ in what they will touch. A hen who ignores a mineral block may work a cuttlebone daily, and one who leaves greens may pick steadily at oyster shell. If every source sits untouched while she is laying, that is worth raising with the vet. Replace a soiled cuttlebone or block, and refresh the shell dish, so what is offered stays clean.
Light, Vitamin D and Using What She Eats
Calcium in the dish only helps if her body can absorb and use it, and that is where vitamin D and light enter the same vet conversation. A hen kept in dim conditions may eat the offered sources yet still struggle to lay them down as shell, which is why owners discuss her access to natural daylight and her overall diet with the vet at the same time as the source list. Time in safe daylight, away from draughts and direct sun through glass, supports the same laying health that the sources feed into.
Treat the light question as part of her whole setup: where the cage stands, how much of the day is bright, and whether anything blocks the light she gets. If she lays repeatedly across a season, or lays despite changes you have already made, the wider laying plan is the vet's to shape. Owners sometimes ask about discouraging laying itself through light hours, handling and nest-like spaces, and those decisions need the vet's picture of this particular hen, her condition and her laying history, not a general rule applied from outside.
Laying Trouble That Needs a Vet at Once
Know the emergency before it happens. A hen who is straining without producing an egg, sitting fluffed on the cage floor, breathing with a bobbing tail, passing few or no droppings, or looking weak and quiet may be struggling to lay, and egg binding is always urgent. The response is a vet call arranged at once, with the hen kept quiet and warm while you arrange it. Nothing else belongs in those minutes: do not press or manipulate her abdomen, do not put oil around the vent, and do not try to dose her with calcium to push the egg through. Well-meant handling can injure a hen in this state, and only the vet can assess her safely.
After any laying difficulty, tell the vet which sources she had available and which she used, because that detail helps the vet judge her calcium picture honestly. In KinsLe you can use Care Teams to give the daily source checks to a particular person in the household, and the timestamped record shows the cuttlebone, the mineral block and the dish of oyster shell were each looked at, even during a busy laying week.