Hansen S L, Spears J W, Lloyd K E, Whisnant C S
Department of Animal Science, North Carolina State University, Raleigh, NC 27695, USA.
J Anim Sci. 2006 Dec;84(12):3375-80. doi: 10.2527/jas.2005-667.
An experiment was conducted to examine the effects of dietary Mn on growth, reproductive performance, and Mn status of beef heifers. Eighty Angus (n = 40) and Simmental (n = 40) heifers, averaging 249 kg, were stratified by BW within a breed and randomly assigned to 1 of 4 treatments providing 0 (control), 10, 30, or 50 mg of supplemental Mn/kg of DM from MnSO(4). Heifers were individually fed a diet containing cottonseed hulls, corn gluten feed, citrus pulp, and ground corn, and the control diet contained 15.8 mg of Mn/kg of DM by analysis. Average daily gain, DMI, and G:F for the 196-d period were not affected by Mn supplementation. Control heifers had reduced (P = 0.04) liver Mn when contrasted with the 3 levels of supplemental Mn. Serum cholesterol was greater (P = 0.001) in Angus compared with Simmental heifers over the course of the 196-d experiment but was not affected by treatment. Dietary Mn did not significantly affect measures of reproductive performance. Results of this study indicate that 15.8 mg of Mn/kg of diet DM should be adequate for growth, onset of estrus, and conception of beef heifers.
进行了一项实验，以研究日粮锰对肉用小母牛生长性能、繁殖性能和锰状况的影响。80头安格斯（n = 40）和西门塔尔（n = 40）小母牛，平均体重249千克，按体重在品种内进行分层，并随机分配到4种处理中的1种，分别提供0（对照）、10、30或50毫克硫酸锰形式的额外锰/千克干物质。小母牛单独饲喂含有棉籽壳、玉米麸质饲料、柑橘果肉和粉碎玉米的日粮，对照日粮经分析含15.8毫克锰/千克干物质。196天期间的平均日增重、干物质采食量和料重比不受锰添加的影响。与3个添加锰水平相比，对照小母牛肝脏锰含量降低（P = 0.04）。在196天的实验过程中，安格斯小母牛血清胆固醇高于西门塔尔小母牛（P = 0.001），但不受处理影响。日粮锰对繁殖性能指标没有显著影响。本研究结果表明，日粮干物质中15.8毫克锰/千克应足以满足肉用小母牛的生长、发情开始和受孕。
