Nejad Jalil Ghassemi, Lee Bae-Hun, Kim Ji-Yung, Park Kyu-Hyun, Kim Won-Seob, Sung Kyung-Il, Lee Hong-Gu
Department of Animal Science and Technology, Sanghuh College of Life Sciences, Konkuk University, Seoul 05029, Korea.
Team of an Educational Program for Specialists in Global Animal Science, Brain Korea 21 Plus Project, Sanghuh College of Life Sciences, Konkuk University, Seoul 05029, Korea.
Asian-Australas J Anim Sci. 2020 Dec;33(12):1940-1947. doi: 10.5713/ajas.20.0350. Epub 2020 Jul 14.
Combination of two stressors on alteration of mineral footprints in animals needs due attention to meet maximum production and welfare, particularly in grazing sheep. This study tested whether ewes (Ovis aries) exposed to water deprivation and thermal-humidity stressors had altered mineral footprints in their wool, serum, urine, and feces.
Nine ewes (age = 3 years; mean body weight = 41±3.5 kg) were divided among a control group with free access to water, and treatment groups with water deprivation lasting either 2 h (2hWD) or 3 h (3hWD) after feeding. Using a 3×3 Latin square design, animals were assigned to treatment groups for three sampling periods of 21 days each (n = 9). Blood was collected by jugular venipuncture. Wool was collected at the end of periods 2 and 3. Metabolic crates designed with metal grated floors were used for urine and feces collection. We measured sodium (Na), magnesium (Mg), phosphorus (P), chloride (Cl), calcium (Ca), manganese (Mn), copper (Cu), iron (Fe), and zinc (Zn).
The wool mineral levels did not differ between the treatment groups, although K was marginally lower (p = 0.10) in the 2hWD group. The serum and urine mineral levels did not differ between the treatments (p>0.05). Fecal K was significantly lower in the 2hWD group than in the other groups (p≤0.05).
In conclusion, water deprivation and thermal-humidity exposure altered the excretion of K, but not of other minerals, in the wool, urine, feces, or serum of ewes. Thus, no additional mineral supplementation is needed for water deprived ewes during thermalhumidity exposure.
两种应激源对动物矿物质足迹变化的影响需要得到充分关注，以实现最大产量和福利，特别是在放牧绵羊中。本研究测试了暴露于缺水和热湿应激源的母羊（Ovis aries）其羊毛、血清、尿液和粪便中的矿物质足迹是否发生了变化。
九只母羊（年龄 = 3岁；平均体重 = 41±3.5千克）被分为对照组，可自由饮水，以及处理组，在喂食后缺水持续2小时（2hWD）或3小时（3hWD）。采用3×3拉丁方设计，将动物分配到处理组，进行三个为期21天的采样期（n = 9）。通过颈静脉穿刺采集血液。在第2期和第3期结束时采集羊毛。使用带有金属格栅地板的代谢笼收集尿液和粪便。我们测量了钠（Na）、镁（Mg）、磷（P）、氯（Cl）、钙（Ca）、锰（Mn）、铜（Cu）、铁（Fe）和锌（Zn）。
处理组之间羊毛矿物质水平没有差异，尽管2hWD组的钾（K）略低（p = 0.10）。处理组之间血清和尿液矿物质水平没有差异（p>0.05）。2hWD组的粪便钾明显低于其他组（p≤0.05）。
总之，缺水和热湿暴露改变了母羊羊毛、尿液、粪便或血清中钾的排泄，但没有改变其他矿物质的排泄。因此，在热湿暴露期间，缺水母羊无需额外补充矿物质。
