Tolerance of high dietary levels of menadione bisulfite-nicotinamide by rainbow trout, Oncorhynchus mykiss

Add time:09/30/2019    Source:infona.pl

The tolerance of menadione bisulfite-nicotinamide (MNB) in rainbow trout fed diets supplemented with graded levels (0, 500, 1000 and 2000 mg/kg) of this vitamin K form for 93 days was studied. Weight gain, weight gain/feed ratio and hematological parameters, such as hemoglobin and bilirubin levels, were similar for control and MNB-fed groups. The weight of liver, kidney and spleen as well as the morphological structure of their parenchyma in MNB-fed trout did not show any detectable modifications as compared to the control group. The results indicate that dietary intake of high levels of MNB exerts no adverse effect on production size of rainbow trout. Therefore, based on the good tolerance and better stability of MNB compared to menadione sodium bisulfite (MSB), we suggest that MNB is a suitable source of vitamin K activity for fish feed manufacture.

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