Application of macroalgal meal feed in aquaculture

Algal meal as feed additive applied to macroalgal meal feed resources can effectively improve the nutritional structure of feed, improve the utilization rate of feed, improve the quality of animal products, and improve the resistance to disease and stress ability of animals. A large number of experiments have shown that adding 2%-5% algal meal to feed can significantly promote the performance and reproductive capacity of livestock and poultry.

In 1985, Yellow Sea Seaweed Industry Co., Ltd. added 5% kelp powder as the basic feed for dairy cows in a dairy farm in Beijing. After nearly a year of experimental observation, the milk yield increased about 1%, the cow estrus rate and pregnancy rate greatly improved. Wu Xinfa reported that when 200 kinds of g/d in kelp powder were added to the feed of cows, the milk yield of cows increased by 7%, and the iodine content of milk increased from 0% to 0%.1mg/l to 0.6mg/1, and the incidence of mastitis decreased by more than 90%. Norwegian scientists added 3% seaweed powder to pigs' diets, followed by small amounts of calcium, phosphorus and phosphoVD, which met the pigs' mineral and vitamin needs. The feeding effect of adding 2% seaweed powder (before 60 mg) to pigs' diet was obvious, and the daily gain was 68g -- 73g higher than that of the control group, but the effect was not obvious in the later period (after 60kg), which may be due to the decreased sensitivity to trace elements after growth. There was no significant change in slaughtering performance after adding seaweed powder. According to Wu Xinfa, 3500 sheep were fed 3500 kelp powder g every day, which increased wool production by 20%, significantly prevented hair removal and white myopathy, and greatly improved the survival rate of lambs.

In 1987, the Institute of Oceanology, Chinese Academy of Sciences and Sichuan Institute of Animal Science and Medicine jointly conducted a comparative experiment on the feeding of domestic chickens and laying ducks, and 2% kelp powder and sargassum powder were added to the feed of shell broilers. The 8-week-old market weight was 12% higher than that of the control group (P<0.01). The experiment of laying ducks also proved that seaweed powder could significantly increase the laying rate of ducks. Kim Young-ui (1996) fed eggs with kelp root powder, arguing that the amount should not exceed 5%. There was no significant difference between weight gain and unit weight gain in chickens, but kelp meal cost much less than regular feed. Hoie waits to add 3%-7% kelp powder to chicken feed because VA and VB increase the growth rate of chickens, and iodine content in meat and eggs increases significantly. It has also been reported that laying hens were fed with feed made up of 4%-6% kelp powder, 77% kelp powder and 77% kelp powder. The iodine content of feed d made up of 77% kelp powder was increased by 15%-30%, the proportion of ingredients was increased by 8%, the laying rate was increased by 20%-30%, and the protein and eggshell thickness were increased. Liu Gang (1995) replaced 2%-6% corn in the diet with kelp powder, which increased the egg production, egg production rate and weight of laying hens, and the iodine content and VA in eggs were higher than those in ordinary eggs on average.