Table 7.
Effect of body weight categories on hormonal profile of commercial layers
| Parameters | Body weight | |||
|---|---|---|---|---|
|
| ||||
| Light | Medium | Heavy | p-value | |
| Hormonal profile at 20 week age | ||||
| T3 (nmol/L) | 1.22±0.04c | 1.41±0.02b | 1.56±0.04a | <0.0001 |
| T4 (nmol/L) | 9.60±0.53c | 13.15±0.45b | 19.98±0.87a | <0.0001 |
| GnRH (pg/mL) | 58.77±4.78c | 132.91±3.27b | 199.75±15.58a | <0.0001 |
| FSH (mIU/mL) | 0.09±0.02b | 0.18±0.02b | 0.28±0.05a | 0.0042 |
| LH (mIU/mL) | 0.04±0.00c | 0.06±0.00b | 0.08±0.00a | <0.0001 |
| Cort (Nm) | 17.28±0.33a | 13.91±0.38b | 10.99±0.46c | <0.0001 |
| Cata (mM) | 1.27±0.10 | 1.41±0.00 | 1.69±0.03 | 0.1875 |
| Hormonal profile at 50 week age | ||||
| T3 (nmol/L) | 1.37±0.03c | 1.57±0.04b | 1.86±0.04a | <0.0001 |
| T4 (nmol/L) | 11.48±0.38c | 15.00±0.63b | 25.06±0.84a | <0.0001 |
| GnRH (pg/mL) | 65.09±3.22c | 146.90±2.36b | 199.63±14.92a | <0.0001 |
| FSH (mIU/mL) | 0.15±0.05c | 0.41±0.02b | 0.60±0.05a | <0.0001 |
| LH (mIU/mL) | 0.06±0.01b | 0.09±0.00b | 1.08±0.30a | 0.0018 |
| Cort (Nm) | 19.42±0.41a | 15.80±0.42b | 14.43±0.28c | <0.0001 |
| Cata (mM) | 1.44±0.07 | 1.64±0.04 | 1.90±0.00 | 0.0620 |
T3, triiodothyronine; T4, thyroxine; GnRH, gonadotropin releasing hormone; FSH, follicular stimulating hormone; LH, luteinizing hormone; Cort, corticosterone; Cata, catalase.
a–c
Means within a row with different superscripts differ (p≤0.05).