<![CDATA[An experiment was undertaken to investigate physiology of growth on broiler chickens under two differences of temperature (18ºC and 32ºC) on final body weight gain, plasma concentration of T3 (triiodothyronine), plasma concentration of T4 (thyoxine) and plasma concentration of corticosterone (CTC). Body weight gain was highest significantly at forced-fed (at 18ºC=361.86 g/chicken/12 d; at 32ºC=345.02 g/chicken/12 d) and it was lowest adlibitum-fed (at 18ºC=354.91 g/chicken/12d; at 32ºC=343.39 g/chicken/12 d). Thus, rate of muscle protein syntesis (%/day) was lowest when the chickens were exposed adlibitum-fed (at 18ºC =7.40 %/day; at 32ºC =3.94%/day). Plasma concentration of T3 (triiodothyronine) was significantly decreased to exposed by adlibitum-fed (at 18ºC =1.45 ng/ml; at 32ºC=0.58 ng/ml); plasma concentration of T4 (thyoxine) was significantly decreased to exposed by adlibitum-fed (at 18ºC=5.95 µg/dl; at 32ºC= 0.58 µg/dl). However, plasma concentration of corticosteron (CTC) was significantly increased when the chickens were exposed by forced-fed (at 18ºC=9.49 ng/ml; at 32ºC=25.89 ng/ml). These results clearly show that plasma concentration hormones of thyroid and corticosteron (CTC) status are affected by temperature, forced-fed and adlibitum-fed, and may play an important role in the regulation of growth in broiler chickens.]]>
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