Doornenbal H, Tong A K, Murray N L
Canada Agriculture, Research Station, Lacombe, Alberta.
Can J Vet Res. 1988 Jan;52(1):99-105.
Reference (normal) values for 12 blood serum components were determined for 48 Shorthorn cows (2-10 years old) and their 48 calves, 357 crossbred cows (12-14 years old), 36 feedlot bulls and 36 feedlot steers. In addition, hemoglobin, hematocrit, triiodothyronine, thyroxine and cortisol levels were determined for the crossbred cows, and feedlot bulls and steers. Reference values were tabulated according to sex, age and stage of lactation. Serum concentrations of urea, total protein and bilirubin, and serum activity of aspartate aminotransferase and lactate dehydrogenase increased with age (P less than 0.05), while calcium, phosphorus and alkaline phosphatase decreased with age (P less than 0.05) from birth to the age of ten years. The Shorthorn cows had the highest levels of glucose at parturition (P less than 0.05) with decreasing levels during lactation. Creatinine concentration decreased during lactation and increased during postweaning. Both lactate dehydrogenase and aspartate aminotransferase levels increased (P less than 0.05) during lactation. Urea and uric acid were present at higher concentrations in lactating than nonlactating cows (P less than 0.05). The values reported, based on a wide age range and large number of cattle, could serve as clinical guides and a basis for further research.
测定了48头短角牛（2至10岁）及其48头犊牛、357头杂交奶牛（12至14岁）、36头育肥牛公牛和36头育肥牛阉牛的12种血清成分的参考（正常）值。此外，还测定了杂交奶牛、育肥牛公牛和阉牛的血红蛋白、血细胞比容、三碘甲状腺原氨酸、甲状腺素和皮质醇水平。参考值根据性别、年龄和泌乳阶段制成表格。从出生到10岁，尿素、总蛋白和胆红素的血清浓度以及天冬氨酸转氨酶和乳酸脱氢酶的血清活性随年龄增加（P小于0.05），而钙、磷和碱性磷酸酶随年龄下降（P小于0.05）。短角牛在分娩时葡萄糖水平最高（P小于0.05），在泌乳期间水平下降。肌酐浓度在泌乳期间下降，在断奶后增加。乳酸脱氢酶和天冬氨酸转氨酶水平在泌乳期间均升高（P小于0.05）。泌乳奶牛的尿素和尿酸浓度高于非泌乳奶牛（P小于0.05）。所报告的值基于广泛的年龄范围和大量的牛，可作为临床指南和进一步研究的基础。
