دراسة مستويات الهرمونات الدرقية عند الدجاج البلدي و الفروج في ظروف التربية المكثفة

الملخص EN

A total of 300 one day old chicks (150 broiler chicks, 150 local Syrian chicks) were raised for 6 weeks in order to measure blood concentration of Thyroxine and Triiodothyronine T3, there were 2 treatments 3 replication for each.

At the end of every week 6 birds were weighed and bled in order to examine thyroid hormones.

The results showed that the local chicken had higher thyroid hormone concentration than broiler at all ages p≤0.001.

At the age of one week the level of T4 and T3 were 10.31,1.81ng/ml respectively for local chicken and 6.5,0.9 ng/ml for broiler.

While the level of both hormones continue to drop all over the experiment to reach at the age of 6 weeks in local chicken 7,1.29 ng/ml for T4 and T3 respectively and 5.5,0.54 in broiler with strong correlation between weight age and both hormone levels, but the relation where stronger in local than broiler.

Our result suggest that the genetic selection over time for increased meat production induced metabolic shift and thyroid hormone level in one of its outcome.