Schingoethe D J, Ludens F C, Sahlu T
J Dairy Sci. 1984 Oct;67(10):2460-3. doi: 10.3168/jds.S0022-0302(84)81597-0.
A feed supplement containing dried microbial fermentation products, cobalt, dextrose, and lactose was fed at 15 g per cow daily to 10 lactating Holstein cows in a switchback experiment with three periods of 5 wk each. Cows averaged 80 days postpartum and produced from 28 to 45 kg daily at the beginning of the experiment. Throughout the 15-wk experiment, cows were fed a 19% crude protein concentrate mix at 1 kg per 3 kg milk produced, 2.3 kg alfalfa hay daily, and corn silage for ad libitum intake. Milk production and composition were similar when supplemented or unsupplemented diets were fed. Means with and without feed supplement were: milk, 28.1 and 28.2 kg/day; fat, 3.57 and 3.55%; protein, 3.07 and 3.08%; and total solids, 12.28 and 12.18%. Daily consumption of dry matter as concentrate (10.4 and 10.2 kg), hay (2.1 and 2.1 kg), and corn silage (8.4 and 8.4 kg) was similar with or without the additive. Estimates of cobalt content of diets fed indicated that cows were consuming more than adequate amounts of cobalt without the supplement. Under conditions of this experiment, there was no advantage for feeding this supplement.
一种含有干燥微生物发酵产物、钴、葡萄糖和乳糖的饲料添加剂，以每头奶牛每天15克的量，在一项折返式试验中喂给10头泌乳的荷斯坦奶牛，试验分为三个阶段，每个阶段5周。试验开始时，奶牛平均产后80天，日产奶量为28至45千克。在整个15周的试验中，奶牛每产3千克奶饲喂1千克19%粗蛋白浓缩混合料，每天饲喂2.3千克苜蓿干草，并随意采食玉米青贮饲料。饲喂添加或不添加添加剂的日粮时，产奶量和奶成分相似。添加和不添加饲料添加剂时的平均值分别为：牛奶，28.1和28.2千克/天；脂肪，3.57%和3.55%；蛋白质，3.07%和3.08%；总固体，12.28%和12.18%。无论是否添加添加剂，干物质的日摄入量相似，分别为浓缩料（10.4和10.2千克）、干草（2.1和2.1千克）和玉米青贮饲料（8.4和8.4千克）。所饲喂日粮的钴含量估计表明，不添加添加剂时奶牛摄入的钴量超过了足够量。在本试验条件下，饲喂这种添加剂没有优势。
