Valent M
Vet Med (Praha). 1984 Oct;29(10):583-92.
The changes in the acid-base indices of the blood of dairy cows in different stages of reproduction cycle were studied in relation to the composition of feed ration in the autumn, winter, spring and summer feeding seasons. The cows were in the following stages of their reproduction cycle: Group I the fourth to sixth month of gravidity, II eighth to ninth month of gravidity, III one to two months after calving. The seasonal composition of feed ration was demonstrated to exert a significant influence on the acid-base balance of the blood of cows in the studied stages of reproduction. A considerable occurrence of metabolic acidoses with different levels of compensation was observed when the cows were given the autumn and winter feed rations. Subclinical acid-base disorders of different directions (metabolic and respiratory alkaloses, acidoses) frequently occurred in the green feeding season. The frequency of acid-base disorders as a result of incorrect nutrition was found to be the highest in highly pregnant cows (group II) and in those one to two months after parturition (group III), i. e. in the periods with a significant influence on the reproduction process. On the whole, the best situation as to the acid-base balance was found in cows in the fourth to sixth month of their gravidity, irrespective of the seasonal effect of feed ration.
研究了不同繁殖周期阶段的奶牛血液酸碱指标变化与秋、冬、春、夏饲养季节日粮组成的关系。奶牛处于以下繁殖周期阶段：第一组怀孕第四至六个月，第二组怀孕第八至九个月，第三组产犊后一至两个月。结果表明，日粮的季节组成对所研究繁殖阶段奶牛的血液酸碱平衡有显著影响。给奶牛投喂秋冬日粮时，观察到相当多不同代偿水平的代谢性酸中毒情况。在青绿饲料季节，经常出现不同方向的亚临床酸碱紊乱（代谢性和呼吸性碱中毒、酸中毒）。因营养不当导致的酸碱紊乱发生率在怀孕后期的奶牛（第二组）和产后一至两个月的奶牛（第三组）中最高，即在对繁殖过程有重大影响的时期。总体而言，无论日粮的季节影响如何，怀孕第四至六个月的奶牛酸碱平衡状况最佳。
