Wulf Ramona, Arends Danny, Dannenberger Dirk, Ettle Thomas, Meyer Ulrich, Mohr Uwe, Brockmann Gudrun A
Albrecht Daniel Thaer-Institute, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany.
Department of Applied Sciences, Northumbria University, Ellison PI, Newcastle upon Tyne NE1 8ST, UK.
Metabolites. 2022 Dec 1;12(12):1201. doi: 10.3390/metabo12121201.
This study examined (1) if fatty acids in bovine hair are influenced by dietary energy levels and (2) if the relationship between energy availability and fatty acids in hair persists across breeds and farms. Sixty-two and 59 Fleckvieh (Simmental), and 55 German Holstein cows from three farms, respectively, were fed two levels of energy concentration of roughage (6.1 and 6.5 MJ net energy for lactation/kg dry matter) and two levels of concentrate supply (150 and 250 g/kg energy-corrected milk). The average body weight was 727 kg (Simmental) and 668 kg (Holstein). The average lactation number was 3.1. Hair samples were taken in lactation weeks 4 and 8. In Simmental cows, a lower energy deficit due to a relatively higher energy intake from high energy concentration of the roughage was associated with higher C18:2-6 and C18:3-3 contents in hair at week 8. In cows from all three farms, higher energy intake between lactation weeks 2 and 6 correlated with higher content of C18:2-6 in hair samples taken in lactation weeks 4 and 8. No correlation was found for C12:0. These results provide the first evidence that increased energy intake increases the contents of C18:2-6 in hair.
（1）牛毛发中的脂肪酸是否受日粮能量水平影响；（2）能量供应与毛发中脂肪酸之间的关系在不同品种和农场间是否持续存在。分别来自三个农场的62头和59头西门塔尔牛，以及55头德国荷斯坦奶牛，被饲喂两种粗饲料能量浓度水平（泌乳净能6.1和6.5 MJ/kg干物质）和两种精料供给水平（150和250 g/kg能量校正乳）。平均体重西门塔尔牛为727 kg，荷斯坦牛为668 kg。平均泌乳次数为3.1次。在泌乳第4周和第8周采集毛发样本。在西门塔尔牛中，由于从高能量浓度粗饲料中摄入相对较高能量导致的较低能量亏缺，与第8周毛发中较高的C18:2-6和C18:3-3含量相关。在所有三个农场的奶牛中，泌乳第2周和第6周之间较高的能量摄入，与泌乳第4周和第8周采集的毛发样本中较高的C18:2-6含量相关。未发现C12:0有相关性。这些结果首次证明能量摄入增加会使毛发中C18:2-6的含量增加。
