Department of Veterinary Medicine, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
School of Bioresources and Environmental Science, Ishikawa Prefectural University, Nonoichi City, Ishikawa, Japan.
Anim Sci J. 2021 Jan-Dec;92(1):e13518. doi: 10.1111/asj.13518.
The effect of growth and parturition on hair cortisol concentrations of cattle was investigated. Plasma, saliva, and hair (black and white from the shoulders and hip) samples were collected from calves at 6 and 24 weeks old and from dairy cattle at the dry (1 and 2 months prepartum) and lactation (10, 50, 150, and 250 days postpartum) periods. Plasma and saliva cortisol concentrations were lower in 24-week-old calves than those of 6-week-old calves, and hair cortisol concentrations decreased regardless of color and position. In 6-week-old calves, hair cortisol concentrations differed between sampling positions, but this difference was not observed in 24-week-old calves. Plasma and saliva cortisol concentrations increased before parturition until 10 days postpartum then decreased until 50 days postpartum. The same trend was observed in the cortisol concentrations of white hair. Contrarily, cortisol concentrations in black hair remained unchanged and was lower than that in white hair. Hair cortisol concentration can vary greatly depending on the location on the body, hair color, cattle age, or parturition. When this method is used, all of the above factors must be considered.
研究了生长和分娩对牛皮质醇浓度的影响。在 6 周龄和 24 周龄时从小牛身上采集血浆、唾液和毛发（肩部和臀部的黑色和白色毛发）样本，在干奶期（产前 1 至 2 个月）和泌乳期（产后 10、50、150 和 250 天）从奶牛身上采集血浆和唾液样本。24 周龄的小牛的血浆和唾液皮质醇浓度低于 6 周龄的小牛，而无论颜色和位置如何，皮质醇浓度均降低。在 6 周龄的小牛中，毛发皮质醇浓度在采样位置之间存在差异，但在 24 周龄的小牛中则没有观察到这种差异。在分娩前，血浆和唾液皮质醇浓度会升高，直到产后 10 天，然后下降，直到产后 50 天。白色毛发的皮质醇浓度也呈现出相同的趋势。相反，黑色毛发的皮质醇浓度保持不变，且低于白色毛发。毛发皮质醇浓度可能会因身体部位、毛发颜色、牛的年龄或分娩而有很大差异。在使用这种方法时，必须考虑到所有上述因素。
