Dietary cation and anion difference: Effects on milk production and body fluid distribution in lactating dairy goats under tropical conditions

作者：Thiet Nguyen; Chaiyabutr Narongsak; Chanpongsang Somchai; Thammacharoen Sumpun^*

来源：Animal Science Journal, 2018, 89(1): 105-113.

DOI：10.1111/asj.12897

• cation-anion difference
• dairy goat
• milk production
• tropical conditions
• water balance

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, 22.81mEq/100g dry matter (DM)) or high DCAD (DCAD, 39.08mEq/100g 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 13.00hours. 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 24h. 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.

• 出版日期2018-1