Laying performance, egg quality, haematological traits, and faecal noxious gas emission of laying hens fed with Tenebrio molitor meal

초록

In the present study the effect of inclusion of different levels of dietary Tenebrio molitor larvae meal (TM) as a dietary protein source on laying performance, egg quality, amino acid and fatty acid profile of egg yolk, haematological traits, cytokines, and faecal noxious gas emission was investigated in laying hen. One hundred and ninety-two 41 weeks old laying hens (Hy-Line Brown; average BW 1973 +/- 28 g) with similar egg production were randomly divided into 4 treatments, including control (without TM), TM1 (1%), TM2 (2%), and TM3 (3%) with 6 replicates per treatment and 8 hens per replicate. The feeding study lasted 56 days. Yolk colour increased linearly when TM was added to the diet (P < 0.05). Concentration of yolk histidine was linearly increased as the TM level increased. An increase in the palmitoleic acid and oleic acid ratio of egg yolk (P < 0.01) and a linear increase in the ratio of linoleic acid were observed with increasing dietary TM levels. In addition, the a-linolenic acid content of egg yolk was quadratically affected (P < 0.05) by an increase in dietary TM. There was also a linear increase (P < 0.05) in total polyunsaturated fatty acid of egg yolk, however, total short-chain and monounsaturated fatty acids were not affected. A linear decrease was observed in the plasma concentration of IL-4 with increasing dietary levels of TM at week 4. Plasma IL-2 concentration decreased linearly (P < 0.01) with increasing dietary TM-levels at week 8. In conclusion, in this study dietary TM-supplementation induced no improvement in egg production but positively affected the egg quality by improving the yolk colour and increasing the yolk content of linolenic acid and unsaturated fatty acid.

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