Linoleic acid in fish oil can affect the size of eggs, but has no effect on the total oil content in yolk, but affects the level and composition of fat in liver. Linoleic acid is the key factor to control the synthesis of lipoprotein in liver. Lipoprotein develops into vesicles in ovaries through blood transports, thus controlling the size of eggs. Practice shows that 2.75 grams of linoleic acid per feather layer significantly increases the weight of eggs. The laying rate of laying ducks during the peak period of laying is generally about 80%. After the peak period, the laying rate will drop to about 605. It is reported that this phenomenon is related to insufficient nutrition of fat, vitamin protein and amino acid in feed. Fish oil just makes up for this. If 2% fish oil is added to the diet of laying ducks after the peak period of laying, the laying rate can be increased to about 73% per feather. The average increase in revenue was 70%.
