اﺛﺮ ﺗﺰرﯾﻖ ﻫﻮرﻣﻮن ﺗﯿﺮوﮐﺴﯿﻦ ﺑﺮ ﻋﻤﻠﮑﺮد رﺷﺪ و ﮐﺎراﯾﯽ ﺗﻐﺬﯾﻪ ﻣﻮﻟﺪﯾﻦ ﻣﺎده اﺳﺘﺮﻟﯿﺎد( Acipenser ruthenus)

Impact of thyroxine injection on female growth performance and feed efficiency of sterlet sturgeon broodstock (Acipenser ruthenus)

اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﺑﺎ ﻫﺪف ﺑﺮرﺳـــﯽ اﺛﺮات ﺗﺰرﯾﻖ ﻫﻮرﻣﻮن 4 T ﺑﺮ ﻋﻤﻠﮑﺮد رﺷـــﺪ و ﮐﺎراﯾﯽ ﺗﻐﺬﯾﻪ ﻣﻮﻟﺪﯾﻦ ﻣﺎده ﻣﺎﻫﯽ اﺳـــﺘﺮﻟﯿﺎد (Acipenser ruthenus) اﻧﺠﺎم ﭘﺬﯾﺮﻓﺖ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ، ﺳﻪ ﮔﺮوه آزﻣﺎﯾﺸﯽ ﺑﺎ دو ﺗﮑﺮار ﺑﺮاي ﻫﺮ ﮔﺮوه و ﭘﻨﺞ ﻋﺪد ﻣﺎﻫﯽ ﺑﻪ ازاي ﻫﺮ ﮔﺮوه در ﻧﻈﺮ ﮔﺮﻓﺘﻪ ﺷﺪ. ﺗﯿﻤﺎرﻫﺎي آزﻣﺎﯾﺶ ﺷﺎﻣﻞ ﺗﯿﻤﺎر ﮐﻨﺘﺮل )درﯾﺎﻓﺖ ﮐﻨﻨﺪه روﻏﻦ ﻧﺎرﮔﯿﻞ(، ﺳﻄﺢ ﭘﺎﺋﯿﻦ ﻫﻮرﻣﻮن 4 T1) T، يك ﻣﯿﻠﯽ ﮔﺮم T4 ﺑﻪ ازاي ﻫﺮ ﮐﯿﻠﻮﮔﺮم وزن ﺑﺪن + روﻏﻦ ﻧﺎرﮔﯿﻞ) و ﺳــﻄﺢ ﺑﺎﻻي ﻫﻮرﻣﻮن T10) T4، ده ﻣﯿﻠﯽ ﮔﺮم T4 ﺑﻪ ازاي ﻫﺮ ﮐﯿﻠﻮﮔﺮم وزن ﺑﺪن + روﻏﻦ ﻧﺎرﮔﯿﻞ) ﺑﻮدﻧﺪ. ﭼﻬﺎر دوره ﺗﺰرﯾﻖ ﺑﻪ ﺻﻮرت داﺧﻞ ﺻﻔﺎﻗﯽ در ﻣﺎﻫﯽ ﻣﺎده ا ﺳﺘﺮﻟﯿﺎد( وزن ﻣﺘﻮ ﺳﻂ آﻏﺎزﯾﻦ 15 /37± 707/97 ﮔﺮم)هر 2 ﻣﺎه ﺑﻪ ﻣﺪت 170 روز اﻧﺠﺎم ﮔﺮدﯾﺪ. در اﻧﺘﻬﺎي آزﻣﺎﯾﺶ، ﺗﻐﯿﯿﺮات ﻋﻤﻠﮑﺮد رﺷــﺪ و ﮐﺎراﯾﯽ ﺗﻐﺬﯾﻪ اﻧﺪازه ﮔﯿﺮي ﺷــﺪﻧﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﻋﻤﻠﮑﺮد ر ﺷﺪ ﻣﺎﻫﯿﺎﻧﯽ ﮐﻪ دوز ﺑﺎﻻي ﻫﻮرﻣﻮن T4 را دريافت كرده بودند بالاتر از ديگر گروه ها بود.همچنين ماهيان در گروه T10 ﺑﺼﻮرت ﻣﻌﻨﯽ دار ﺑﻬﺘﺮﯾﻦ ﮐﺎراﯾﯽ ﺗﻐﺬﯾﻪ را ﻧﺴﺒﺖ ﺑﻪ دﯾﮕﺮ ﺗﯿﻤﺎرﻫﺎي آزﻣﺎﯾﺸﯽ ﻧﺸﺎن دادﻧﺪ. ﺑﺮ اﺳﺎس ﻣﻄﺎﻟﻌﻪ ﺣﺎﺿﺮ، ﻫﻮرﻣﻮن تيروكسين در دوز 10 ﻣﯿﻠﯽ ﮔﺮم ﺑﻪ ازاي ﮐﯿﻠﻮﮔﺮم وزن ﺑﺪن ﻣﯽ ﺗﻮاﻧﺪ ﺳﺒﺐ اﺛﺮات ﻣﺜﺒﺖ ﺑﺮ ﻋﻤﻠﮑﺮد ر ﺷﺪ در ﻣﻮﻟﺪﯾﻦ ﻣﺎده ا ﺳﺘﺮﻟﯿﺎد گردد.

The objective of this study was to examine the effects of T4 injection on growth performance and feed efficiency in sterlet sturgeon (Acipenser ruthenus). Three treatments with two replicates and 5 fish for each replicate were considered. The experimental treatments included: control (coconut oil alone), low dose of T4 (T1; 1 mg T4/kg body weight + coconut oil) and high dose of T4 (T10; 10 mg T4/kg body weight + coconut oil). Four intraperitoneally injections of sterlet sturgeon female (initial weight 707.97 ± 37.15 g) were performed every 2 months over a 170-day trial. Growth performance and feed efficiency were determined at the end of study. The results showed fish treated with high dose of T4 were noted higher growth performance from other groups. Furthermore, the fish in T10 group showed significantly the best feeding efficiency from other treatments. Based on the current study, 10 mg/kg body weight of thyroxine hormone in sterlet sturgeon broodstock can perform positive effects on growth performance.