两种抗菌素油剂防治奶牛干奶期乳房炎的疗效比较

Comparison of 2 antibiotic preparations for dry cow therapy.

以杭州乳房炎诊断法(HMT)、细菌学检验和临床检查结果为依据,综合判断PC-805和TA-125两种抗菌素油剂对干奶期乳房炎的防治效果。66头受试奶牛随机分成两组,第一组35头136个乳区于停奶当天经由乳头管注入20ml PC-805;第二组31头121个乳区以同样方法注入20ml TA-125。第一组牛在干奶前有72个乳区为HMT强阳性(++、+++),至产后降为11个,转阴率为84.7％;第二组牛在干奶前HMT强阳性乳区为66个,产后降至6个,转阴率为90.9％。第一、二组HMT强阳性乳区的细菌转阴率分别为57.4％和68.4％,除去新感染后则分别为70.5％和75.4％。这两种制剂对链球菌感染的效果较好,而对葡萄球菌的作用较差,第一组牛在千奶期间的临床发病率为2.9％,第二组为1.7％。尽管TA-125的疗效较好,但统计结果表明这两种制剂对HMT和细菌转阴率以及临床发病率方面均无显著差异(P>0.05)。

Two dry cow antibiotic preparations coded with PC-805 and TA-125 were compared as to their efficacy for the control of dry cow mastitis as evaluated with Hangzhou Mastitis Test ( HMT ) , bacterial examination and clinical incidence. 6G cows were randomly divided into two groups. Group Ⅰ involved 35 cows with 138 quarters which were infused through the teat canal with 20 ml PC-803 after the last milking of lactation, and group 222, 31 cows with 121 quartwes receiving 20 ml TA-125 treatment in the same way. Among 13G quarters in group Ⅰ, 72 and 11 quarters were found HMT-high-graded ( ++, + + + ) two weeks before drying off and one week after calving respectively with 84.7% reduction. The respective HMT-high-graded quarters were G6 and 6 in group Ⅱ, reduced by 90.9% through the dry period. There were 57.4% and 68.4% decrease of bacterial infections in quarters with high HMT readings of the two groups, before drying, 70.5% and 75.4% if exclusive of the new infections Both preparations were more effective on the streptococcal infections (74.2% and 87.9% resp. ) than those caused by staphylococci (44.1% and 48.3% resp. ) . The clinical incidence during the dry period was 2.9% in group Ⅰ and 1.7% in group Ⅱ. Statistical analyses demonrtrated that there were no significant differences between these two preparations as to their effocacy on the HMT grades, subclinical bacterial infections and clinical incidence (P>0.05) alathough better results were obtained in the TA-123 treated group.