钴是瘤胃维生素B12合成所必需的微量矿物质,但是来源在瘤胃微生物利用方面不同,即,碳酸钴水溶性差,而乙酸盐和乳酸盐形式是水溶性的。缺乏将有机乳酸钴与其他钴盐进行比较的报道。研究目的是确定以两种包含率饲喂乳酸钴是否与饲料中使用的碳酸盐和乙酸盐形式产生相似的生长性能和组织钴浓度。将100只重385±20kg的安格斯杂交母牛随机分配到五种处理中的一种。牛饲喂基础饮食加:1)碳酸钴以30mg/steer/d的速度供应钴,2)醋酸钴以30毫克/天的速度供应钴,3)醋酸钴以60mg/steer/d的速度供应钴,4)乳酸钴以30毫克/天的速度供应钴,和5)乳酸钴以60mg/steer/d供应钴。根据行业标准喂养牛,直到身体脂肪沉积在视觉上被认为是USDAChoice的等级。这两个区块中的每一个都是92天和117天,分别。收获牛,并记录car体测量值以及脂肪采样,心,肾,肝脏,和肌肉的组织钴浓度。三个统计对比包括:1:无机(碳酸钴)与有机(乙酸钴和乳酸);2:乙酸钴与乳酸钴;和3:进料速率为30vs.60mg/steer/d钴。体重增加,平均每日收益,干物质摄入量,饲喂所有钴源和饲喂率的牛的饲料转化率相似(P>0.10)。热car体重量,产量等级,背部脂肪厚度,饲喂所有钴源和夹杂物速率的牛之间的ribeye面积相似(P>0.10)。肝脏,肾,肌肉,和脂肪钴浓度相似(P>0.08)的牛饲喂无机与有机钴源。与醋酸钴相比,饲喂乳酸钴对肝脏没有影响(P>0.10),肾,心,肌肉,和脂肪组织钴浓度。饲喂60mg/steer/d钴与30mg/steer/d相比增加(P<0.01)肝脏,肾,心,和脂肪组织钴浓度,而肌肉是一种趋势(P<0.06)。研究表明,饲喂可溶性乳酸钴,一种新的钴源,导致了类似的增长表现,car体特征,与乙酸钴和碳酸盐相比,组织中的钴浓度。
Cobalt is an essential trace mineral required for ruminal vitamin B12 synthesis, but sources differ in ruminal microbial utilization, i.e., cobalt carbonate is poorly water soluble, whereas acetate and lactate forms are water soluble. Reports comparing organic cobalt lactate to other cobalt salts are lacking. The study objective was to determine if feeding cobalt lactate at two inclusion rates resulted in similar growth performance and tissue cobalt concentrations as the carbonate and acetate forms used in feeds. One hundred Angus cross bred steers weighing 385 ± 20 kg were randomly assigned to one of five treatments. Cattle were fed a basal diet plus: 1) cobalt carbonate to supply cobalt at 30 mg/steer/d, 2) cobalt acetate to supply cobalt at 30 mg/steer/d, 3) cobalt acetate to supply cobalt at 60 mg/steer/d, 4) cobalt lactate to supply cobalt at 30 mg/steer/d, and 5) cobalt lactate to supply cobalt at 60 mg/steer/d. Cattle were fed according to industry standards until body fat deposition was visually deemed to grade USDA Choice, which was 92 and 117 d for each of the 2 blocks, respectively. Steers were harvested and carcass measurements recorded along with sampling of adipose, heart, kidney, liver, and muscle for tissue cobalt concentrations. Three statistical contrasts consisted of: 1: inorganic (cobalt carbonate) vs. organic (cobalt acetate and lactate); 2: cobalt acetate vs. cobalt lactate; and 3: feeding rate of 30 vs. 60 mg/steer/d cobalt. Body weight gains, average daily gains, dry matter intake, and feed conversions were similar (P > 0.10) for steers fed all cobalt sources and feeding rates. Hot carcass weight, yield grade, back fat thickness, and ribeye area were similar (P > 0.10) among steers fed all cobalt sources and inclusion rates. Liver, kidney, muscle, and adipose cobalt concentrations were similar (P > 0.08) for steers fed inorganic vs. organic cobalt sources. Feeding cobalt lactate compared with cobalt acetate did not affect (P > 0.10) liver, kidney, heart, muscle, and adipose tissue cobalt concentrations. Feeding 60 mg/steer/d cobalt compared with 30 mg/steer/d increased (P < 0.01) liver, kidney, heart, and adipose tissue cobalt concentrations, while muscle was a tendency (P < 0.06). The study demonstrated that feeding soluble cobalt lactate, a new cobalt source, resulted in similar growth performance, carcass characteristics, and tissue cobalt concentrations when compared with cobalt acetate and carbonate.