Abstract：In this experiment, different source essential oils were added to broiler diets to study their effects on growth performance, immune function and intestinal development. Single factor test design was adopted in this test, a total of 504 one-day-old broilers (mixed male and female) with similar body weight were randomly divided into 6 groups (7 replicates in each group and 12 replicates in each group):control group (CK group) was fed a basic diet; antibiotic group (AG group) was added with antibiotics (Clomithromycin) at a dosage of 5 mg/kg; plant essential oil groups[EO1 group (the effective component was thymol, and effective content was 1.7%), EO2 group (the effective component were carvol and cinnamaldehyde, and effective content were 5% and 3%) and EO3 group (the effective component were cinnamaldehyde and thymol, and effective content was 10%), EO4 group (the effective component were thymol and carvol, and effective content was 25%)] were added with four plant essential oils at dosages of 150, 100, 100 and 200 mg/kg. The test lasted for 42 days. The results showed as follows:1) compared with the CK group, the average daily weight gain and body weight in AG group, EO3 group and EO4 group increased significantly (P<0.05). There was no significant difference in spleen index, bursa of Fabricius index and thymus index (P>0.05). 2) Compared with the CK group, the content of immunoglobulin G in serum in AG group increased significantly (P<0.05), and serum immunoglobulin M content in AG group, EO3 group and EO4 group also increased significantly (P<0.05). 3) Compared with the CK group, the crypt depth of duodenum in AG group decreased significantly (P<0.05), and the villus height of ileum significantly elevated (P<0.05); compared with the CK group, jejunal villus height in EO3 group increased significantly (P<0.05); crypt depth in AG group, EO1 group, EO2 group and EO4 group decreased significantly (P<0.05); the ratio of jejunal villus height to crypt depth in AG group was significantly higher than that in CK group (P<0.05). In conclusion, it is found that plant essential oil can promote the growth performance and immune function of broilers. Among them, EO3 group has the best effect, which is close to the effect of antibiotic feeding, indicating that it has a potential as a substitute of antibiotics.
周洪彬, 魏景坤, 刘洋, 王月, 徐良梅. 植物精油对肉仔鸡生长性能、免疫功能及肠道发育的影响[J]. 动物营养学报, 2020, 32(8): 3887-3895.
ZHONG Hongbin, WEI Jingkun, LIU Yang, WANG Yue, XU Liangmei. Effects of Plant Essential Oil on Growth Performance, Immune Function and Intestinal Development of Broilers. Chinese Journal of Animal Nutrition, 2020, 32(8): 3887-3895.
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