Molecular Nutrition

Effects of Dietary Oregano Essential Oil on Complex Stomach Development, Digestive Enzyme Activities and Ruminal Microflora of Sheep

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  • 1. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    2. Animal Husbandry, Pasture and Green Agriculture Institute, Gansu Academy of Agricultural Sciences, Key Laboratory for Sheep, Gat and Cattle Germplasm and Straw Feed in Gansu Province, Lanzhou 730070, China

Received date: 2018-11-05

  Online published: 2019-04-16

Abstract

This study aimed to investigate the effects of dietary oregano essential oil on complex stomach development, digestive enzyme activities and ruminal microflora of sheep. Eighteen 3-month-old crossbred (Suffolk×small tail Han sheep) F1 male lambs with similar body weight[(20.30±1.27) kg] and good body condition were randomly divided into 3 groups with 6 lambs per group. Sheep in the control group (CON group) were fed a basal diet, and those in the oregano essential oil groups were fed the basal diet supplemented with 4 (EO4 group) or 7 g/d (EO7 group) oregano essential oil. The experiment lasted for 72 days after 10 days adaption. The result showed as follows:1) the volume of rumen was significantly increased with the dietary oregano essential oil supplemental level increasing (P<0.05). Compared with the CON group, the volume index of rumen in EO7 group was increased by 2.09% (P<0.05), while the volume index of abmasum in EO7 group was decreased by 1.61% (P<0.05). 2) Compared with the CON group, the cellulase and pepsase activities of rumen in EO4 group were significantly increased (P<0.05), and the cellulase and β-glucanase activities of abomasum in EO4 group were significantly increased (P<0.05); the cellulase, β-glucanase and α-amylase activities of rumen and reticulum in EO7 group were significantly increased (P<0.05), and the cellulase activity of omasum and the pepsase activity of abomasum in EO7 group were significantly increased (P<0.05). 3) The population of protozao was significantly decreased by diet supplemented with 4 and 7 g/d oregano essential oil (P<0.05). Compared with the CON group, the population of rumen Ruminococcus flavefaciens in EO4 group was significantly increased (P<0.05); the populations of rumen fungi, Ruminococcus flavefaciens, Ruminococcus albus and Fibrobacter succinogenes in EO7 group were significantly increased (P<0.05). In conclusion, dietary oregano essential oil can advance the development of rumen and the proliferation of rumen fungi and fibrinolytic bacteria, and improve the digestive enzyme activities, while inhibit the growth of rumen protozoa. The effect is better when oregano essential oil supplemental level is 7 g/d.

Cite this article

ZHOU Rui, LANG Xia, WANG Cailian, LIU Lishan, WEI Sheng, SONG Shuzhen, WU Jianping . Effects of Dietary Oregano Essential Oil on Complex Stomach Development, Digestive Enzyme Activities and Ruminal Microflora of Sheep[J]. Chinese Journal of Animal Nutrition, 2019 , 31(4) : 1910 -1918 . DOI: 10.3969/j.issn.1006-267x.2019.04.051

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