Table 1.
Maternal TH content deposited in egg yolk of different avian species.
| Species | T4 in ng/ga | T3 in ng/ga | T4/T3b | References |
|---|---|---|---|---|
| PRECOCIAL BIRDS | ||||
| Chicken (Gallus gallus) | ||||
| - Shaver strain (layer) | 3.80 ± 0.81 | 1.50 ± 0.39 | 2.13 | (7) |
| - Ross strain (broiler) | 14.60 ± 2.24 | 1.23 ± 0.20 | 9.93 | (8) |
| - Hy-line strain (layer) | 30.4 | 1.0 | 25.4 | (9) |
| - White leghorn strain (layer) | 1.05 ± 0.36 | (10) | ||
| - Cornish rocks strain (broiler) | 0.46 ± 0.38 | (10) | ||
| Japanese quail (Coturnix japonica) | 9.74 ± 2.20 | 3.44 ± 0.88 | 2.38 | (11) |
| 6 | 2.5 | 2.01 | (12) | |
| ALTRICIAL BIRDS | ||||
| Rock pigeon (Columbia livia) | 3.06 ± 0.99 | 1.10 ± 0.21 | 2.33 | (13) |
| Great tit (Parus major) | 1.15 ± 0.42 | 0.14 ± 0.07 | 6.73 | (11) |
| Collared flycatcher (Ficedula albicollis) | 7.21 ± 0.99 | 1.97 ± 0.48 | 3.06 | (11) |
| Pied flycatcher (Ficedula hypoleuca) | 5.72 ± 1.42 | 1.86 ± 0.56 | 2.57 | (11) |
a
Average concentrations ± SD are given when information is available.
b
Ratio calculated on a molar basis.