Research on the application effect of insect protein in eliminated laying hens breeding
Insect protein,as an ecological and economical protein feed resource,is an important product for reducing and replacing soybean meal and fish meal.This article took black soldier fly and fly maggots(5%,10%and 15%dried basis powder)as research objects to explore their application effects in the breeding of rejected layer from aspects such as growth performance,physiological function,nutritional components,flavor quality and economic benefits.The experimental period was 74 days.The experimental results showed that the substitution of insect powder in the diet could to some extent affect the egg production ability of eliminated laying hens,and the egg yield rate as positively correlated with the amount of black water fly powder added(P<0.05).When the insect powder amount reached 15%,the egg yield rate reached the maximum value(84.79%).The substitution of insect powder didn't significantly affect the liver function load,antioxidant capacity,and metabolic capacity of eliminated laying hens(P>0.05).The egg yolk lecithin content of the 15.00%fly maggot powder group,10.00%black soldier fly powder group,and 15.00%black soldier fly powder group were significantly increased by 2.90%,10.45%,14.10%,respectively,compared with the blank control group(P<0.05).The effect of feeding black soldier fly powder on the conversion of crude protein in chicken leg/breast meat was generally better than that of fly maggot powder,but it was not significant(P>0.05).And the crude fat conversion rate of chicken leg meat in the fly larvae group was significantly higher than that in the black soldier fly group by 15.72%～76.61%(P<0.05).A higher proportion of black soldier fly powder(15.00%)could to some extent improve the taste and flavor of eggs and chicken(P<0.05).The feeding of black soldier fly powder could increase the profit margin of eliminated laying hens by 70.30%,which had significant economic benefits compared to fly maggot powder.Insects as a substitute for protein feed could not only reduce feed costs and enhance the utilization value of eliminated laying hens,but also alleviate the current domestic protein shortage problem and promote low-carbon and circular economy development.It had good feasibility in the field of livestock and poultry breeding.
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