This study aimed to determine the effect of dietary cation and anion difference (DCAD) on milk production and body fluid distribution in lactating dairy goats. Ten dairy goats were selected and divided into two groups, five animals each. Animals received either control DCAD (control, 22.81 mEq/100 g dry matter (DM)) or high DCAD (DCAD, 39.08 mEq/100 g DM). The results indicated that rectal temperature (Tr), respiration rate, milk yield and compositions did not differ between groups. But the percentage change of Tr from the DCAD group was lower than the control group between 09.00 and 13.00 hours. DM intake tended to increase in the DCAD group. Dairy goats in the DCAD group drank more water, but urinary excretion and plasma antidiuretic hormone concentration remained unchanged. Apparent water balance was higher from the DCAD group over 24 h. There was no effect of DCAD on plasma and blood volumes, but tended to increase in extracellular fluid and thereby increased total body water. The present results indicate that animals supplemented with high DCAD increase their total body water and apparent water balance. These results have contributed to the process of adaptation for evaporative cooling and would be useful in slowing down the elevation in Tr.

中文翻译：

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饮食中阳离子和阴离子的差异：在热带条件下对泌乳奶山羊产奶量和体液分布的影响。

这项研究旨在确定饮食阳离子和阴离子差异（DCAD）对泌乳奶山羊产奶量和体液分布的影响。选择十只奶山羊，分成两组，每组五只。动物接受对照DCAD（对照22.81mEq / 100g干物质（DM））或高DCAD（DCAD 39.08mEq / 100g DM）。结果表明，两组之间的直肠温度（Tr），呼吸频率，产奶量和组成没有差异。但是在09.00和13.00小时之间，DCAD组的Tr百分比变化低于对照组。DCAD组的DM摄入量倾向于增加。DCAD组的奶山羊喝更多的水，但尿排泄和血浆抗利尿激素浓度保持不变。在24小时内，DCAD组的表观水分平衡较高。DCAD对血浆和血容量没有影响，但倾向于增加细胞外液，从而增加体内总水分。目前的结果表明，补充有高DCAD的动物会增加其体内总水分和表观水分平衡。这些结果促进了蒸发冷却的适应过程，将有助于减缓Tr的升高。