Grass carp fry have a good digestion effect on fishmeal; among plant protein feeds, soybean meal has the best digestion effect, followed by rapeseed meal, and cotton meal has the worst digestion effect.

Grass carp fry should use starch as their main energy source. Rice, corn, defatted rice bran, and wheat bran can all be used as energy feed for grass carp.

Fish meal: animal protein, fish meal has comprehensive nutrition, and its nutritional composition is basically similar to that of fish, so its utilization rate is high. It is an ideal protein source. However, fishmeal is expensive and of unstable quality, which limits its large-scale addition.

Soybean meal: plant protein, high in protein content, good quality, and rich in lysine. However, it has low methionine content, no stickiness, and poor food attraction.

Rapeseed cake: The protein content is high, but it contains a series of toxins. It is generally limited to less than 20%.

Wheat bran: an energy raw material with loose texture and more crude fiber. Excessive dosage will reduce the cohesiveness.

Wheat: energy raw material, higher in protein than corn, and nutrients are easy to digest. Can improve feed adhesion.

Barley: energy raw material with relatively high lysine content.

Soybean oil: Soybean oil contains a large amount of linoleic acid. But it is not suitable for storage and tastes bad.

When the protein-to-energy ratio in grass carp feed was 79:21, grass carp obtained higher digestive enzyme activity.

Feed protein sources are divided into animal protein sources and plant protein sources. The optimal animal and plant protein ratio for grass carp fry is 1:1.5.

Full-fat soybeans should not exceed 30%, and rapeseed cake should not exceed 20%. Too much wheat bran will reduce the cohesiveness.

The above information is compiled by China Feed Ingredients Information Network. I hope it will be helpful to you and hope to adopt it.