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Ontogenesis and taste bud cell turnover in the chicken. I. Gemmal cell renewal in the hatchling

Taste bud cell turnover rate was examined in oral epithelium of the precocial chick, which at hatching contains the adult complement of taste buds. Forty newly hatched chicks received single or double pulse injections of tritiated thymidine (specific activity was 6.7 Curies/ millimole; dosage was 0.5 micro Curies/g body weight, intraperitoneally). Anterior mandibular epithelium was processed for light microscopic autoradiography at 2 and 16 hours, as well as 1, 2, 3, 4, 6, 8, 10, 12, 14, 16, 18, and 20 days after the initial pulse. In a coded and randomized procedure, the section (7 μm) through the bud's center was selected for counting > 6 silver grains over round‐clear and gracile‐dense gemmal cell nuclei. The mean number of labelled cells/bud varied significantly (P ⩽ 0.01) during the first four posthatch days, yielding the fastest gemmal cell turnover rates (3.4–4.4 days) yet reported in vertebrates.