Jackson J A, Hemken R W
Department of Animal Science, University of Kentucky, Lexington 40546-0215.
J Dairy Sci. 1994 May;77(5):1430-6. doi: 10.3168/jds.S0022-0302(94)77081-8.
Our objective was to examine whether feeding low cation-anion diets altered the Ca status of the growing calf. Holstein calves (n = 32; 16 males) were blocked at 56 to 70 d after birth according to sex and birth date and assigned randomly to dietary treatments containing Ca content and cation-anion balances as milliequivalents of (Na+K)-(Cl+S)/100 g of dietary DM of .42% and -18, .52% and -18, .42% and 13, and .52% and 13. Feed intake did not differ among treatments. Calves fed the diet with cation-anion balance of 13 had higher gain (.85 vs. .71 kg/d) than those fed the diet with balance of -18. Venous blood pH (7.374 vs. 7.323), partial pressure of CO2 (47.9 vs. 45.6 mm Hg), and bicarbonate (28.3 vs. 23.3 mmol/L) were higher for calves fed the 13 versus -18 balances. Plasma Ca and P were unaffected by Ca or cation-anion balance. Urinary pH was higher for calves fed the high than the low balance (7.442 vs. 6.047). Urinary Cl and Ca excretion was higher for calves fed the low than the high balance. Breaking strengths for 7th and 9th ribs were higher for calves fed the high balance and higher for the 7th rib only for calves fed the high Ca diet. Cation-anion balance altered Ca metabolism, but it is unclear whether Ca requirements were also altered.
我们的目标是研究饲喂低阴阳离子日粮是否会改变生长犊牛的钙状态。荷斯坦犊牛（n = 32；16头雄性）在出生后56至70天，根据性别和出生日期进行分组，并随机分配到含有不同钙含量和阴阳离子平衡的日粮处理组，日粮中钙含量和阴阳离子平衡以每100克日粮干物质中（钠+钾）-（氯+硫）的毫当量计，分别为0.42%和-18、0.52%和-18、0.42%和13、0.52%和13。各处理组的采食量没有差异。饲喂阴阳离子平衡为13的日粮的犊牛比饲喂阴阳离子平衡为-18的日粮的犊牛增重更高（分别为0.85千克/天和0.71千克/天）。饲喂阴阳离子平衡为13的日粮的犊牛静脉血pH值（7.374对7.323）、二氧化碳分压（47.9对45.6毫米汞柱）和碳酸氢盐（28.3对23.3毫摩尔/升）均高于饲喂阴阳离子平衡为-18的日粮的犊牛。血浆钙和磷不受钙或阴阳离子平衡的影响。饲喂高阴阳离子平衡日粮的犊牛尿液pH值高于饲喂低阴阳离子平衡日粮的犊牛（7.442对6.047）。饲喂低阴阳离子平衡日粮的犊牛尿液中氯和钙的排泄量高于饲喂高阴阳离子平衡日粮的犊牛。饲喂高阴阳离子平衡日粮的犊牛第7和第9肋骨的抗断强度更高，仅饲喂高钙日粮的犊牛第7肋骨的抗断强度更高。阴阳离子平衡改变了钙的代谢，但尚不清楚钙的需求量是否也发生了改变。
