Why does a deficiency of dietary zinc impair feathering and cause skeletal deformities in brown layer pullets?

Zinc is a critically vital trace mineral that serves as a structural component and catalytic cofactor for over 300 metalloenzymes, including carbonic anhydrase, alkaline phosphatase, and RNA polymerase. During the rapid growth phase of brown layer pullets (reared in hubs like Sargodha and Mirpur Khas), zinc is essential for cellular division and protein synthesis. Specifically, the process of feathering requires zinc for the keratinization of feather sheath cells and the synthesis of structural keratin proteins. A deficiency leads to delayed feathering, brittle feather shafts, and poor protective cover. Furthermore, bone development relies on zinc as a coenzyme for collagen synthesis in the osteoid matrix. Without adequate zinc, osteoblast activity is depressed, and chondrocyte proliferation in the growth plate is arrested, leading to perosis, slipped tendon, and shortened, deformed leg bones (tibiotarsus and metatarsus). Incorporating highly bioavailable organic zinc chelates (such as zinc methionine) is vital. Pullet rearers can study structural trace mineral nutrition in the Poultry Encyclopedia, buy high-purity zinc pre-mixes on Poultry Plaza, monitor daily feed commodity rates on Poultry Rates, and list healthy pullet flocks on Murghi Mandi.