Effects of Combined Supplementation of Oregano Oil and Rumen-Protected Lysine on Lactation Performance and Nitrogen Excretion of Dairy Cows

ZHANG Kaixiang, XING Defang, GAO Xulei, TENG Lebang, LYU Yongyan, SUN Guoqiang

doi:10.3969/j.issn.1006-267x.2019.03.041

2019 , Vol. 31 >Issue 3: 1342 - 1351

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.03.041

Molecular Nutrition

Effects of Combined Supplementation of Oregano Oil and Rumen-Protected Lysine on Lactation 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 Laiiyang City, Laiyang 265217, China;
3. Agriculture and Water Conservancy Bureau of Laoshan, Qingdao 266061, China;
4. Animal Husbandry and Veterinary Bureau of Pingdu, Qingdao 266700, China

Received date: 2018-08-02

Online published: 2019-03-18

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Abstract

This experiment was conducted to determine the effects of combined supplementation of oregano oil (Oo) and rumen-protected lysine (RPLys) on lactation performance and nitrogen excretion of dairy cows. Forty healthy Holstein lactating dairy cows with similar age, body weight, parity, milk yield, milk composition and lactation period[(105±15) days post-calving)] were divided into 10 groups with 4 cows per group. The cows in control (C) group were fed a basal diet, while those in experimental groups were fed the basal diet supplemented with different supplemental levels of Oo[11.5 (L), 13.0 (M) and 14.5 g/(d·cow) (H)] and RPLys[27.5 (L), 30.0 (M) and 32.5 g/(d·cow) (H)] to constitute 9 combinations, which were named as LL, LM, LH, ML, MM, MH, HL, HM and HH groups (first letter indicated Oo supplemental level, and the second letter indicated RPLys supplemental level), respectively. The pre-experiment lasted for 15 days, and the experiment lasted for 60 days. The results showed as follows:1) milk yield in experimental groups was extremely significantly higher than that in C group (P<0.01), and it in MM group had the highest value. 2) Milk fat percentage and milk protein percentage in experimental groups were higher than those in C group in different degrees, and both of them in MM group had the highest values, which were extremely significantly higher than those in C group (P<0.01); milk somatic cell count in experimental groups was extremely significantly reduced compared with C group (P<0.01), and MM group was the lowest. 3) Compared with C group, milk nitrogen, nitrogen deposition and nitrogen apparent digestibility in experimental groups were extremely significantly increased (P<0.01), and all of them in MM group had the lowest values; compared with C group, total nitrogen excretion in LL, LM, LH, ML, MM, MH, HL, HM and HH groups was decreased by 6.63% (P<0.01), 9.29% (P<0.01), 7.73% (P<0.01), 11.81% (P<0.01), 18.21% (P<0.01), 15.06% (P<0.01), 10.83% (P<0.01), 11.27% (P<0.01) and 6.95% (P<0.01), respectively, and MM group was the lowest. The results indicate that combined supplementations of Oo and RPLys can improve lactation performance and reduce nitrogen excretion; considering all the above indexes, the optimal combination is 13.0 g/(d·cow) Oo and 30.0 g/(d·cow) RPLys.

Key words： oregano oil; rumen-protected lysine; lactation performance; nitrogen excretion

Cite this article

ZHANG Kaixiang, XING Defang, GAO Xulei, TENG Lebang, LYU Yongyan, SUN Guoqiang . Effects of Combined Supplementation of Oregano Oil and Rumen-Protected Lysine on Lactation Performance and Nitrogen Excretion of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2019 , 31(3) : 1342 -1351 . DOI: 10.3969/j.issn.1006-267x.2019.03.041

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