ntxiv dag zog rau cov pob txha

Tshwj xeeb formulated rau pigeon siv:
Qhov kev lag luam siab tshaj plaws avian calcium ntxiv.Qhov tseem ceeb rau thaum calcium deficiency tej zaum yuav xav tias yog thaum yug me nyuam.
Tswj cov qib calcium kom raug.