【作者】 罗绪刚； C.R.Dove；

【Author】 Luo Xugang(Institute of Animal Science, Chinese Academy of Agricultural Sciences Beijing 100094 )C. R. Dove(Department of Animal and Dairy Science, Coastal Plain Experiment Station,College of Agriculture and Environmental Sciences, University of Georgia Tifton31793-0748)

【机构】 中国农业科学院畜牧研究所； 美国佐治亚大学农业与环境科学学院动物与奶牛科学系；

【摘要】 用26±2日龄断奶、体重6.8±0.8千克的约克夏×汉普夏×杜洛克杂交阉公猪32头,进行两个为期15天的代谢试验,研究饲粮添加15和250mg/kg铜(硫酸铜源)与添加0%和5%动物脂肪对断奶仔猪矿物元素消化率及血浆、组织中矿物元素含量的影响。在每个试验中,由4头来源于4窝的阉公猪组成的4组猪按2×2析因安排的完全随机区组设计随机分配到4个处理中。猪只个体饲养于环境调控室(27±2℃)内的不锈钢代谢笼中。添加250mg/kg 铜明显提高了铜(P<0.002)和钠(P<0.07)的表观消化率,但对铁、锌、锰、钙、镁、磷和钾的表观消化率无明显影响(P>0.10)。添加5%脂肪对任何元素的消化率均无明显影响(P>0.10)。所测元素消化率均无铜与脂肪的交互作用(P>0.10)。添加250mg/kg铜提高了血浆、肝和肾中铜含量(P<0.001),而降低了血浆(P<0.02)和肝(P<0.002)中铁含量。添加5%脂肪增加了肾(P<0.04)和心(P<0.08)中铁含量。对脾中钙(P<0.01)、镁(P<0.08)、钠(P<0.02)和钾(P<0.06)及脾重量(P<0.02)均观测到铜与脂肪的互作效应。与采食15mg/kg 添加铜和不添加脂肪饲粮的猪相比,采食15mg/kg添加铜和5%添加脂肪饲粮的猪脾钙、钠含量和脾重较高(P<0.05),而对于采食添加250mg/kg铜和5%脂肪饲粮的猪,其脾钙、钠含量和脾重均低于采食其余饲粮的猪(P<0.05),但脾镁和钾含量却比采食其余饲粮的猪高(P<0.07)。这些结果表明,添加250 mg/kg铜影响了断奶仔猪对一些矿物元素的利用,且铜与脂肪的互作影响了脾脏常量元素状况及脾重。更多还原

【Abstract】 Two 15-d metabolism trials were conducted using a total of 32 crossbred barrows ([Yorkshire x Hampshire] x Duroc) weaned at 26 ±2 d of age and weighing 6.8±0.8 kg. The effect of the addition of 15 or 250 mg/kg Cu as CuSO4 · 5H2O to diets containing 0 or 5 % added animal fat on mineral digestibility and mineral contents in plasma and tissues in weanling pigs was investigated. In each trial, four groups of four littermate barrows were randomly assigned to one of four treatments in a randomized complete block design involving a 2 x 2 factorial arrangement. Pigs were individually kept in stainless steel metabolism crates in an environmentally controlled (27±2℃) room. The addition of 250 mg/kg Cu improved apparent digestibility of Cu (P<0.002) and Na (P<0.07), but had no effect (P>0.10) on apparent digestibility of Fe, Zn, Mn, Ca, Mg, P, and K. The addition of 5 % fat had no effect (P>0.10) on any of the mineral digestibility. There was no Cu x fat interaction (P>0.10) for any of the mineral digestibility. The addition of 250 mg/kg Cu to the diet increased Cu (P<0.001) in plasma, liver and kidney and decreased Fe in plasma (P<0.02) and liver (P<0.002). The addition of 5 % fat increased Fe in kidney (P<0.04) and heart (P<0.08). Copper X fat interactions were observed for spleen Ca (P<0.01), Mg (P<0.08), Na (P<0.02) and K (P<0.06), and spleen weight (P<0.02). Pigs fed the 15 mg/kg Cu plus 5 % fat diet had increased (P<0.05) spleen Ca and Na and spleen weight compared to pigs fed the 15 mg/kg Cu plus 0 fat diet, and pigs fed the 250 mg/kg Cu plus 5 % fat diet had decreased (P<0.05) spleen Ca and Na and spleen weight, and increased (P<0.07) spleen Mg and K. compared to pigs fed other diets. These results indicate that 250 mg/kg Cu affected the utilization of some minerals, and the Cu X fat interaction influenced spleen macromineral status and its weight in weanling pigs.更多还原