Hormones thyroïdiennes iodées libres plasmatiques chez le dromadaire

Plasma free thyroxine (FT4) and triiodothyronine (FT3) levels were measured in 30 adult male camels, 31 non-pregnant non-lactating female camels, and 13 female camels and their fetuses or newborns from birth to 30 days. In adult males plasma FT4 and FT3 concentrations were 24.8 ± 2.8 pM and 8.6 ± 1.4 pM, respectively. During the sixth month of pregnancy, they were 43.4 ± 4.1 pM and 1.4 ± 0.4 pM in fetuses, and 31.1 ± 2.8 pM and 16.9 ± 2.1 pM in their dams, respectively. In the newborn, the concentrations were very high at birth (50.7 ± 4.1 pM and 18.6 ± 2.3 pM, respectively), gradually decreased until day 7 to 28.3 ± 2.8 pM (P < 0.05) and 9.6 ± 1.7 pM (P < 0.05), respectively, then remained stable until day 30. Changes in perinatal and postnatal levels of plasma FT4 and FT3 in the female camel and her newborn were similar to those observed in other domestic ruminants.