Effects of Oregano Oil on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows

ZHANG Kaixiang, XING Defang, GAO Xulei, WANG Xiaowei, SUN Guoqiang

doi:10.3969/j.issn.1006-267x.2018.05.034

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 5: 1902 - 1910

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.05.034

Molecular Nutrition

Effects of Oregano Oil on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows

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1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
2. Workstation of Animal Husbandry and Veterinary Medicine of Tuanwang for Laiyang, Laiyang 265217, China;
3. Agriculture and Water Conservancy Bureau of Laoshan, Qingdao 266061, China;
4. Animal Husbandry and Veterinary Bureau of Laiyang, Laiyang 265200, China

Received date: 2017-12-06

Online published: 2018-05-06

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Abstract

This experiment was conducted to study the effects of oregano oil on ruminal microbial protein (MCP) production, milk performance and nitrogen excretion of dairy cows. Forty healthy Holstein lactating cows with similar age, body weight, parity, milk yield, milk composition and lactation period[(90±15) d] were randomly divided into 4 groups with 10 cows per group. The addition amount of oregano oil in diets of control group and test groups 1, 2 and 3 was 0, 10, 13 and 16 g/(d·head), respectively. The pretest lasted for 15 d, and the formal test lasted for 60 d. The results showed as follows:1) ruminal MCP production in test groups 1, 2 and 3 was significantly increased by 9.77% (P<0.01), 16.14% (P<0.01) and 6.99% (P<0.05) compared with that in control group, respectively. 2) Milk yield in test groups 1, 2 and 3 was increased by 5.10% (P>0.05), 8.36% (P<0.05) and 5.00% (P>0.05) compared with that in control group, respectively; milk fat percentage in test group 2 was significantly higher than that in control group (P<0.05); Milk somatic cell count in test groups 1, 2 and 3 was extremely significantly reduced compared with that in control group (P<0.01), especially the test group 2 was the lowest. 3) Total nitrogen excretion in test groups 1, 2 and 3 was reduced by 6.84% (P<0.01), 11.14% (P<0.01) and 4.72% (P<0.05) compared with that in control group, respectively. It can be seen that the adding oregano oil to diets can significantly increase the ruminal MCP production, improve the milk performance, and decrease nitrogen excretion of dairy cows. Considering the above indices, the optimal addition amount of oregano oil in diets of dairy cows is 13 g/(d·head).

Key words： oregano oil; ruminal microbial protein; milk performance; nitrogen excretion

Cite this article

ZHANG Kaixiang, XING Defang, GAO Xulei, WANG Xiaowei, SUN Guoqiang . Effects of Oregano Oil on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2018 , 30(5) : 1902 -1910 . DOI: 10.3969/j.issn.1006-267x.2018.05.034

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