Belibasakis N G, Triantos A
Department of Animal Husbandry, Faculty of Veterinary Medicine, University of Thessaloniki, Greece.
J Dairy Sci. 1991 Feb;74(2):467-72. doi: 10.3168/jds.S0022-0302(91)78193-9.
Eighteen multiparous Friesian cows were paired according to lactation number and expected calving date and assigned randomly to one of two diets in a crossover design experiment to study effects of sodium carbonate on milk yield, milk composition, blood metabolites plus Na, and K in early lactation. Diets were concentrate containing either 0 or 1.2% sodium carbonate (as fed) for ad libitum intake plus 7.0 kg of wet brewers grains and 5.5 kg of long-stemmed alfalfa hay per cow daily. Dry matter intake, milk yield, milk protein percentage and yield, and percentages of milk lactose and milk SNF were not significantly affected. Compared with the control diet, the sodium carbonate treatment increased milk fat percentage (3.98 vs. 3.53%) and yield (1.23 vs. 1.07 kg/d), 4% FCM yield (30.9 vs. 28.2 kg/d) and milk total solids (12.47 vs. 12.04%). No significant differences were observed in blood plasma concentrations of glucose, CP, urea, acetate, beta-hydroxybutyrate, triglycerides, FFA, Na, or K when sodium carbonate was added to diets for early lactation cows.
18头经产弗里生奶牛根据泌乳次数和预期产犊日期进行配对，并在交叉设计实验中随机分配到两种日粮之一，以研究碳酸钠对早期泌乳奶牛产奶量、牛奶成分、血液代谢物以及钠和钾的影响。日粮为自由采食的精料，分别含有0%或1.2%的碳酸钠（按喂食状态计），每头奶牛每天额外供应7.0千克湿啤酒糟和5.5千克长茎苜蓿干草。干物质采食量、产奶量、乳蛋白百分比和产量以及乳糖和非脂固形物的百分比均未受到显著影响。与对照日粮相比，碳酸钠处理提高了乳脂率（3.98%对3.53%）和产量（1.23千克/天对1.07千克/天）、4%标准乳产量（30.9千克/天对28.2千克/天）以及牛奶总固形物含量（12.47%对12.04%）。在早期泌乳奶牛日粮中添加碳酸钠后，血浆中葡萄糖、粗蛋白、尿素、乙酸、β-羟基丁酸、甘油三酯、游离脂肪酸、钠或钾的浓度未观察到显著差异。
