Effects of bupleurum extract on the haematological, mineral, and hormonal profiles of heat-stressed dairy cows

Autor: Lun Tan, Xianzhi Sun, Jingjing Li, Qingfeng Wang, Zhao Zhuo, Yu Li, Yanjing Su, Caiyun Fan, Jianbo Cheng
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Italian Journal of Animal Science, Vol 22, Iss 1, Pp 51-58 (2023)
Druh dokumentu: article
ISSN: 1594-4077
1828-051X
1828051X
DOI: 10.1080/1828051X.2022.2157763
Popis: This study was conducted to investigate the effects of Bupleurum extract (BE) on the haematological profiles, the mineral and hormone levels of heat stressed dairy cows. Forty Holstein cows (75 ± 15 days in milk, 37.5 ± 1.8 kg of milk/d, and 1.7 ± 0.4 parity) with heat stress were randomly assigned to four treatments, which consisted of 0, 0.25, 0.5, or 1.0 g BE/kg DM (Dry Matter). Compared with the control group, cows that were fed 0.5 g/kg BE had a higher red blood cell count, haemoglobin, haematocrit, and white blood cell count. Compared with the control group, the supplementation of 0.25 and 0.5 g/kg BE decreased creatine kinase levels. Compared with the cows that were fed 0 or 1.0 g/kg BE, glutamic-oxaloacetic transaminase and alkaline phosphatase activities were lower in those given 0.5 g/kg BE, while serum glutamic-pyruvic transaminase was lower in those given 0.25 and 0.5 g/kg BE. Compared with the control group, the supplementation of 0.5 and 1.0 g/kg BE decreased sodium concentrations and increased potassium and calcium concentrations. In addition, the supplementation of 1.0 g/kg BE decreased phosphorus concentrations, while that of 0.5 g/kg BE increased chloride concentrations. As for hormone levels, triiodothyronine and prolactin levels increased in cows given 1.0 g/kg BE, while cortisol levels were lower in cows given 0.5 g/kg BE. Further, growth hormone levels were elevated in cows fed 0.25 g/kg BE. These findings suggest that supplemental BE at 0.5 g/kg could have positive effects on the blood metabolism of heat-stressed cows.HIGHLIGHTS Supplementation of 0.5 g/kg Bupleurum extract improved the haematological parameters of heat stressed dairy cows; Bupleurum extract can be used as a feed additive for cows.
Databáze: Directory of Open Access Journals
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