High Dietary Cation and Anion Difference Enhanced Renal Response to an Acute Acid Load of Lactating Goat Fed Under Tropical Conditions

IF 1.7 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Sapon Semsirmboon, Dang Khoa do Nguyen, Narongsak Chaiyabutr, Sutthasinee Poonyachoti, Thomas A. Lutz, Sumpun Thammacharoen
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Abstract

High ambient temperature (HTa) in tropical conditions leads to evaporative heat dissipation by panting in lactating dairy goats. This panting causes respiratory hypocapnia, which increases the renal excretion of buffer molecules including sodium, potassium, and bicarbonate. In response, renal acid excretion decreases to preserve acidity. Besides hypocapnia, lactation and HTa could further deplete buffer molecules, enhancing acid preservation. This current study restored buffer molecules using high dietary cation and anion difference (DCAD) regimen and hypothesized that renal acid excretion during acute acid load would be increased in dairy goats fed high DCAD under HTa. To investigate this, 12 early-lactating dairy goats were randomly assigned to two groups: control and DCAD, which were fed control and high-DCAD diets, respectively, for 8 weeks. Acute acid loading during HTa was induced by high-dose ascorbic acid (AA) supplementation. During Weeks 4 and 8, the vehicle and AA were supplemented on the last two consecutive days of each week. The results showed that the renal acid excretion in DCAD group was higher than control group during high-dose AA supplementation. Together with high renal buffer excretion by DCAD, an increased renal acid excretion may be partially mediated by an increase in buffer reserve.

热带条件下高阴阳离子饲粮差异增强了哺乳山羊对急性酸负荷的肾脏反应
热带条件下的高环境温度(HTa)导致泌乳山羊通过喘气蒸发散热。这种喘息引起呼吸性低碳酸血症,从而增加肾脏对钠、钾和碳酸氢盐等缓冲分子的排泄。因此,肾酸排泄减少以保持酸度。除低碳酸血症外,泌乳和HTa可进一步消耗缓冲分子,增强酸保存。本研究采用高饲粮正阴离子差(DCAD)方案恢复缓冲分子,并假设高DCAD饲喂的奶山羊在HTa条件下急性酸负荷时肾酸排泄会增加。为此,将12只泌乳早期奶山羊随机分为对照组和DCAD组,分别饲喂对照组和高DCAD饲粮,试验8周。大剂量补充抗坏血酸(AA)可诱导HTa过程中的急性酸负荷。在第4周和第8周,在每周的最后两天连续补充载药和AA。结果表明,在高剂量AA添加过程中,DCAD组的肾酸排泄量高于对照组。与DCAD引起的高肾缓冲液排泄一起,肾酸排泄的增加可能部分由缓冲液储备的增加介导。
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来源期刊
Animal Science Journal
Animal Science Journal 生物-奶制品与动物科学
CiteScore
3.80
自引率
5.00%
发文量
111
审稿时长
1 months
期刊介绍: Animal Science Journal (a continuation of Animal Science and Technology) is the official journal of the Japanese Society of Animal Science (JSAS) and publishes Original Research Articles (full papers and rapid communications) in English in all fields of animal and poultry science: genetics and breeding, genetic engineering, reproduction, embryo manipulation, nutrition, feeds and feeding, physiology, anatomy, environment and behavior, animal products (milk, meat, eggs and their by-products) and their processing, and livestock economics. Animal Science Journal will invite Review Articles in consultations with Editors. Submission to the Journal is open to those who are interested in animal science.
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