CATDOLL : CATDOLL: How to calculate the feed coefficient for bighead carp farming?

1. How to calculate the feed coefficient for bighead carp farming?

Feed coefficient, also known as meat gain rate, is one of the most widely used indicators for evaluating feed value in my country. It indicates the number of feed units required to increase one unit of fish meat. In other words, it is how many kilograms of feed are needed for each kilogram of fish meat (usually fresh weight). The calculation formula is: Feed coefficient = feed amount / fish weight gain = total weight of feed during the feeding period / (total weight of fish when leaving the pond - total weight of fish species).

2. What are the important characteristics of cladocerans as bighead carp feed?

Cladocera: Cladocera are small crustaceans, commonly known as water fleas. Their protein content accounts for about 45% of their dry weight, and they are rich in nutrients and have extremely high bait value. Common ones include long-spined fleas, carinae fleas, naked-bellied fleas and elephant-trunk fleas.

3. How long is the usage period of nucleotides, a new feed additive for bighead carp?

Nucleotides are immune enhancers for fish, and their addition cycle in feed is also a hot topic of research. When adding nucleotides to feed, it is very important to choose a suitable addition cycle. Adding nucleotides for too long will have a negative effect on the growth and immunity of fish.

4. How to use self-prepared feed additives in bighead carp farming?

Feed additives refer to substances added to feed that can promote the digestion and absorption of nutrients, regulate body metabolism, ensure animal health, improve the efficiency of nutrient utilization, and improve animal production levels, thereby improving the quality of animal products. For vitamin and mineral additives, due to the wide variety and small dosage, and the high technical content in the combination of various vitamins and minerals, the effect of farmers buying single vitamins and minerals themselves is very poor, and it is impossible to achieve a balanced combination of nutritional elements. Therefore, you can choose vitamin and mineral premixes produced by regular manufacturers and add them reasonably according to the species and growth stage of farmed fish.

5. What are the specific contents for determining the feed value in bighead carp farming?

There are mainly the following aspects: determination of the content and total energy value of various nutrients in feed; determination of the digestibility and digestible energy of feed and various nutrients; determination of relevant aspects such as the participation of feed in fish metabolism after digestion and absorption, or direct breeding tests, etc. Since these determinations require some advanced equipment and conditions, the determination work is limited, and many determinations cannot be carried out in production units at present. Therefore, only direct breeding tests or feeding effects are the traditional, commonly used, and most practical and effective methods for evaluating the nutritional value of feed. The evaluation indicators of breeding effects are mostly expressed in feed coefficients and feed efficiency.