Effects of Lonicera japonica Extract on Performance, Serum Biochemical Indexes and Immune Function of Heat-Stressed Dairy Cows

MA Fengtao; SHAN Qiang; JIN Yuhang; LI Hongyang; GAO Duo; SUN Peng

doi:10.3969/j.issn.1006-267x.2020.05.030

2020 , Vol. 32 >Issue 5: 2209 - 2217

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.05.030

RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Lonicera japonica Extract on Performance, Serum Biochemical Indexes and Immune Function of Heat-Stressed Dairy Cows

MA Fengtao ,
SHAN Qiang ,
JIN Yuhang ,
LI Hongyang ,
GAO Duo ,
SUN Peng

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State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received date: 2019-11-24

Online published: 2020-05-15

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Abstract

The objective of this study was to investigate the effects of Lonicera japonica extract (LJE) on performance, serum biochemical indexes and immune function of heat-stressed dairy cows, and to explore the optimum amount of LJE to effectively alleviate heat stress of dairy cows. Twenty healthy Chinese Holstein cows with similar milk yield, parity and lactation days were randomly assigned to 4 groups with 5 cows per group. Cows in the control group (CON group) were fed a basal diet, while other in experimental groups were fed basal diets supplemented with 14 (LJE-14 group), 28 (LJE-28 group) and 56 g/d (LJE-56 group) LJE, respectively. The pre-experimental period lasted for 2 weeks, and the experimental period lasted for 8 weeks. The results showed as follows:1) dietary supplementation of LJE could significantly decreased the rectal temperature of heat-stressed dairy cows (P<0.05), but had no significant effect on respiratory rate (P>0.05). 2) Dietary supplementation of LJE had no significant effects on dry matter intake, milk yield, milk fat rate, milk protein rate, lactose rate, non-fat solid content and total solid content of heat-stressed dairy cows (P>0.05). 3) Dietary supplementation of LJE could significantly decreased the serum creatinine content of heat-stressed dairy cows (P<0.05), but had no significant effect on the contents of uric acid, urea, total protein, albumin and glucose in serum (P>0.05). With the supplemental amount of LJE increased, the serum glucose content showed a quadratically increasing trend (P=0.072). 4) The contents of immunoglobulin G and interleukin-4 in serum of heat-stressed dairy cows of LJE-28 group were significantly higher than those of the CON group (P<0.05). Dietary supplementation of LJE had no significant effects on the contents of immunoglobulin A, immunoglobulin M, interleukin-1β and interleukin-2 in serum of heat-stressed dairy cows (P>0.05), and showed a trend to reduce the serum heat shock protein-72 content of heat-stressed dairy cows (P=0.084). In summary, dietary supplementation of LJE have no significant effect on the performance of heat-stressed dairy cows, can improve the immune response of heat-stressed dairy cows, and help to alleviate the heat stress of dairy cows. Under the condition of this experiment, the optimal amount for effectively alleviate heat stress of dairy cows is 28 g/d.

Key words： Lonicera japonica extract; heat stress; dairy cows; performance; serum biochemical indexes; immune function

Cite this article

MA Fengtao , SHAN Qiang , JIN Yuhang , LI Hongyang , GAO Duo , SUN Peng . Effects of Lonicera japonica Extract on Performance, Serum Biochemical Indexes and Immune Function of Heat-Stressed Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2020 , 32(5) : 2209 -2217 . DOI: 10.3969/j.issn.1006-267x.2020.05.030

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