Bradley B D, Colaianne J J, Allen E H
J Dairy Sci. 1982 Jun;65(6):1036-40. doi: 10.3168/jds.S0022-0302(82)82306-0.
Effects of diet and age on selected blood chemistry and hematologic characteristics were studied in 20 Holstein bull calves. Milk-fed calves (treatment 1) were maintained exclusively on a milk-replacer diet. Conventionally fed calves (treatment 2) were provided a calf-starter diet and alfalfa hay beginning at 2 wk of age and were weaned from milk replacer at 7 wk of age. Blood samples were collected by jugular puncture from all animals just before the morning feeding at 6, 7, 9, and 11 wk of age. Milk-fed calves had greater glucose concentration in blood serum. Urea nitrogen of blood increased in conventionally fed calves from 6 through 11 wk and decreased in milk-fed calves. Hemoglobin concentration and packed cell volume decreased in calves receiving milk-replacer diet. Total protein and albumin concentrations were greater in the conventionally fed group. Treatment differences also existed for calcium and cholesterol concentrations and in alkaline phosphatase activity.
研究了饮食和年龄对20头荷斯坦公牛犊某些血液生化指标和血液学特征的影响。人工哺乳犊牛（处理1）仅以代乳粉日粮维持。传统饲养的犊牛（处理2）从2周龄开始提供犊牛开食料日粮和苜蓿干草，并在7周龄时停止饲喂代乳粉。在6、7、9和11周龄晨饲前，通过颈静脉穿刺采集所有动物的血样。人工哺乳犊牛血清中的葡萄糖浓度更高。传统饲养的犊牛血液中的尿素氮从6周龄到11周龄增加，而人工哺乳犊牛则下降。接受代乳粉日粮的犊牛血红蛋白浓度和红细胞压积降低。传统饲养组的总蛋白和白蛋白浓度更高。钙和胆固醇浓度以及碱性磷酸酶活性也存在处理差异。
