Potassium carbonate as a potassium source and dietary buffer for lactating Holstein cows during hot weather.
Potassium carbonate as a potassium source and dietary buffer for lactating Holstein cows during hot weather.
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碳酸钾作为炎热天气下泌乳荷斯坦奶牛的钾源和膳食缓冲剂。
DOI：
10.3168/jds.s0022-0302(87)80012-7
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发表时间：
1987
影响因子：
3.5
通讯作者：
L. Rowe
中科院分区：
文献类型：
--
作者：
J. W. West;C. Coppock;K. Z. Milam;D. Nave;J. Labore;L. Rowe
24泌乳荷斯坦奶牛提供的饮食中含有0.93，1.29，和1.53%的钾在炎热的天气。饲喂1.53%钾的奶牛比饲喂0.93%或1.29%钾的奶牛消耗更多的干物质。产奶量和成分没有差异。含钾1.29%和1.53%的日粮，钾摄入量和排泄分数增加，粪便排出量占摄入量的百分比下降。镁排泄分数最少，粪排出量最大的奶牛饲喂1.29%的钾。粪钠排出量和粪便排出量占摄入量的百分比降低了1.53%的膳食钾。在比较期2，碳酸钾在0，0.5，或1.0%的饲料消耗或产奶量没有影响，但缓冲饮食增加乳脂率和降低乳蛋白的百分比。缓冲剂对瘤胃pH值、挥发性脂肪酸或干物质或纤维的消化率没有影响。在炎热的天气下，奶牛对日粮中1.53%的钾补充剂反应良好，但在高钾日粮中，必须考虑对其他矿物质的影响。氯化物，虽然目前以上的要求，在所有的饮食，是更大的最高钾饮食。
Twenty-four lactating Holstein cows were offered diets containing .93, 1.29, and 1.53% potassium during hot weather. Cows fed 1.53% potassium consumed more dry matter than cows fed either .93 or 1.29% potassium. Milk production and composition were not different. Potassium intake and fractional excretion increased, and fecal output as a percentage of intake declined with diets containing 1.29 and 1.53% potassium. Magnesium fractional excretion was least and fecal output greatest in cows fed 1.29% potassium. Fecal sodium output and fecal output as a percentage of intake was reduced by 1.53% dietary potassium. During comparison period 2, potassium carbonate at 0, .5, or 1.0% had no effect on feed consumption or milk yield, but buffered diets increased milk fat percentage and depressed milk protein percentage. No effects of buffers on ruminal pH, volatile fatty acids, or digestibility of dry matter or fiber were noted. Cows responded favorably during hot weather to potassium supplementation at 1.53% of the diet, but with high dietary potassium, effects on other minerals must be considered. Chloride, although present above requirements in all diets, was greater in the highest potassium diet.