Bernier J F, Fillion F J, Brisson G J
J Dairy Sci. 1984 Oct;67(10):2369-79. doi: 10.3168/jds.S0022-0302(84)81585-4.
Thirty 1-wk-old male Holstein calves were allotted randomly to six groups into a 3 X 2 factorial design. The control diet was skim milk, whey, tallow, vitamins, and minerals. Either Alpha-Floc or pectin was added at 5% dry matter. Supplementary iron was added at 30 and 50 ppm (dry basis). The six diets were fed for 14 wk. Calves without supplementary iron were mildly anemic at 6 wk and severely at 14 wk (7 and 5 g/dl hemoglobin). At 14 wk, both fibers had decreased blood hemoglobin in calves given supplementary iron. Feed refusal began at 8 wk with the appearance of anemia for calves unsupplemented with iron, but both Alpha-Floc and pectin decreased feed refusal. Supplementary iron practically eliminated feed refusal. Supplementary iron improved average daily gain and feed conversion, but dietary fibers had no effect. Adding Alpha-Floc and pectin to the diets reduced frequency of diarrheic feces. Mean carcass weight of calves fed supplementary iron was 11.6% higher than that of unsupplemented calves. Supplementary iron decreased liver lipids and increased glutamic oxaloacetic transaminase activity in blood plasma.
30头1周龄的雄性荷斯坦犊牛被随机分配到六组，采用3×2析因设计。对照日粮由脱脂牛奶、乳清、牛脂、维生素和矿物质组成。以干物质计，添加5%的α-絮凝剂或果胶。分别添加30 ppm和50 ppm（干基）的补充铁。六种日粮喂养14周。未补充铁的犊牛在6周时轻度贫血，14周时严重贫血（血红蛋白分别为7 g/dl和5 g/dl）。在14周时，对于补充了铁的犊牛，两种纤维都降低了血液中的血红蛋白含量。未补充铁的犊牛在8周时随着贫血症状的出现开始拒食，但α-絮凝剂和果胶都减少了拒食情况。补充铁实际上消除了拒食现象。补充铁提高了平均日增重和饲料转化率，但日粮纤维没有影响。在日粮中添加α-絮凝剂和果胶降低了腹泻粪便的频率。补充铁的犊牛的平均胴体重比未补充的犊牛高11.6%。补充铁降低了肝脏脂质含量，并提高了血浆中的谷草转氨酶活性。
