A fourth experiment was conducted using custommade,
isonitrogenous, isocaloric diets to compare Vg production in
male tilapia fed a fish meal-based diet versus that in fish fed a soybean
meal-based diet. The ingredients and estimated nutrients of the
defined feeds are shown in Table 1. Fish were kept in separate tanks
and fed commercial trout diet, a custom-designed fish meal-based
diet, or a custom-designed fish meal-free diet (soy-based diet), containing
soybean meal as the primary protein source (10 fish/
treatment). They were fed to apparent satiation once daily. Blood
was sampled after 20 days, as described above.
2.2. Real-time quantitative RT-PCR (rtqRT-PCR)
Liver tissue was homogenized in Tri-Reagent and total RNA was
isolated using the manufacturer's instructions. Transcripts for Vgs A, B,
A fourth experiment was conducted using custommade,isonitrogenous, isocaloric diets to compare Vg production inmale tilapia fed a fish meal-based diet versus that in fish fed a soybeanmeal-based diet. The ingredients and estimated nutrients of thedefined feeds are shown in Table 1. Fish were kept in separate tanksand fed commercial trout diet, a custom-designed fish meal-baseddiet, or a custom-designed fish meal-free diet (soy-based diet), containingsoybean meal as the primary protein source (10 fish/treatment). They were fed to apparent satiation once daily. Bloodwas sampled after 20 days, as described above.2.2. Real-time quantitative RT-PCR (rtqRT-PCR)Liver tissue was homogenized in Tri-Reagent and total RNA wasisolated using the manufacturer's instructions. Transcripts for Vgs A, B,
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