高营养水平组肌纤维密度极显著的高于其它两组（P<0.01）；
There were extremely significantly different (P<0.01) in the content of density of muscle fiber.
他们发现，经过一段时期的高营养水平环境，在遗传学上截然不同的杂交品种产生了。
They found that, during periods of high nutrient levels, genetically distinct hybrid species emerged.
在低营养水平、低铜组肉鸭的生长性能显著（P<0 05），高于低营养水平、高铜组和高营养水平、高铜组；
The low nutritional level and low copper group had significantly higher growth performance than 2 high copper groups (P<005).
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