Abstract：
Two experiments were conducted to examine the impact of trace mineral (TM) source on in vitro and in vivo solubility characteristics. Experiment 1: Hydroxy TM (HTM) and sulfate TM (STM) sources of Cu, Mn, and Zn were incubated separately in water for 24 h. Immediately after mixing, initial pH of each solution was greater (P < 0.03) for HTM compared to STM for all elements. Final pH tended to be greater for Cu (P = 0.09) and Zn (P = 0.07) from HTM compared to STM. Water solubility of Cu, Mn, and Zn from STM was greater (P < 0.01) than HTM sources. Experiment 2: Eight steers fitted with rumen cannula were blocked by body weight and randomly assigned to treatments. Treatments consisted of 10 mg Cu, 40 mg Mn, and 60 mg Zn/kg DM from either STM or HTM sources. Steers were individually fed a cracked corn-corn silage-based diet. Treatments were top-dressed daily. Rumen contents were collected at 0, 2, and 4 h post-feeding on d 1 and 14. On d 15, strained ruminal fluid and particle-associated microorganisms were obtained. Zinc was more tightly bound (P = 0.01) to the digesta in HTM-supplemented steers compared to STM on d 14. These data indicate that TM source influences pH and solubility of Cu, Mn, and Zn in water and may affect rumen soluble Cu concentrations and binding strength of Zn to solid digesta.
摘要：
进行了两个实验以检查痕量矿物质（TM）来源对体外和体内溶解度特性的影响。实验1：Cu的羟基TM（HTM）和硫酸盐TM（STM）源，Mn,和Zn分别在水中孵育24小时。混合后立即，与所有元素的STM相比，HTM的每种溶液的初始pH值更高（P<0.03）。与STM相比,来自HTM的Cu(P=0.09)和Zn(P=0.07)的最终pH趋向于更大。铜的水溶性，Mn,来自STM的Zn大于HTM源（P<0.01）。实验2:八只装配有瘤胃套管的牛被体重阻塞并随机分配到治疗中。处理包括10毫克铜，40毫克锰，和60mgZn/kg来自STM或HTM来源的DM。分别饲喂以玉米-玉米青贮饲料为基础的饮食。治疗是每天穿上衣服。在第1天和第14天喂食后0、2和4小时收集瘤胃内容物。在第15天，获得了紧张的瘤胃液和颗粒相关微生物。与第14天的STM相比，在补充HTM的牛中，锌与消化物的结合更紧密（P=0.01）。这些数据表明，TM源影响Cu的pH和溶解度，Mn,和水中的锌，可能会影响瘤胃可溶性铜的浓度和锌与固体消化物的结合强度。
