Dietary dl -methionyl- dl -methionine supplementation increased growth performance, antioxidant ability, the content of essential amino acids and improved the diversity of intestinal microbiota in Nile tilapia ( Oreochromis niloticus )

The dipeptide dl -methionyl- dl -methionine (Met-Met) has extremely low water solubility and better absorption than other methionine sources (such as dl -methionine and l -methionine) available in the market. Therefore, six diets (D1, D2, D3, D4, D5 and D6) containing 0, 0·07, 0·15, 0·21, 0·28 and 0...

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