Effect of Dietary Tetramethylpyrazine on Egg Production, Nutrient Retention and Cecal Bacterial Diversity in Aged Laying Hens

This study aimed to investigate the effect of tetramethylpyrazine (TMP) supplementation on egg production, nutrient retention and cecal microbiota diversity using 288 commercial Hy-Line brown hens as wk 75 86. Four treatments consisted TMP addition at 0 (control, basal diet), 100, 150 200 mg/kg diet. The results showed that diets supplemented with improved egg-laying rate 77 compared control, which led an increase (p<0.001) mass by 97-225 g/hen throughout whole trial, a linear (p=0.003) incremental doses was found. At 86, apparent digestibilities dry matter crude protein were enhanced (p<0.05), exhibiting consistent increases (p≤0.033) doses. However, did not cause alpha beta microbiota. suggest can be additive improve production digestibility aged laying hens.