Bovine placental lactogen invokes rapid growth in chinook salmon |
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Authors: | E McLEAN RH DEVLIN EM DONALDSON JC BYATT |
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Institution: | Biotechnology Laboratory, Aquaculture Section, Department of Civil Engineering, Aalborg University, Aalborg, Denmark;West Vancouver Laboratory, Biotechnology, Genetics &Nutrition Section, West Vancouver, BC, Canada;Monsanto Company, St Louis, MO 63198, USA |
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Abstract: | The effect of recombinant bovine placenta) lactogen (rbPL) treatment upon growth of juvenile chinook salmon, Oncorhynchus tshawytscha (Walbaum) (14.0 ± 0.31 g wet wt), was examined over a period of 6 weeks. Experimental animals were either injected (5 μg rbPL g?1 week?1), implanted with a cholesterol pellet containing 0.4 mg rbPL (approximately 4 μg g?1 week?1), or orally and rectally intubated with 7.5 μg rbPL g?1 week?1. Control animals were injected with bovine serum albumen (BSA), 5 μg g?1 week?1, implanted with a placebo or orally intubated (7.5 μg BSA g?1 week?1). Significant (P < 0.05) growth acceleration was recorded for rbPL-injected and pellet-implanted groups from week 2 onwards when compared against all other groups. Oral or rectal intubation of rbPL (7.5 μg rbPL g?1 week?1), however, was without effect. Condition factor decreased in all groups, but was significantly lower in rbPL-injected and pellet-implanted fish at trial end when compared against controls. No differences were recorded between groups for per cent body moisture or relative gut length. Hepatosomatic index was significantly (P < 0.05) higher in rbPL-injected and rbPL-implanted chinook salmon versus other fish. |
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Keywords: | chinook salmon growth acceleration placental lactogen |
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