Epidemiological Investigation On Dairy Cow Coccidiosis And Cryptosporidiosis In The Area Of Baoto

The epidemiological investigations of dairy cow Coocidiosis and Cryptosporidiosis in the area of Baotou were firstly reported in this paper; By using the routing methods of fecal examination and observing the clinical symptoms of 265 dairy cows selected from 10 different cow farms in the suburban districts of Baotou , the infection rate and infection intensity of the Coccidiosis and the Cryptospridiosis in dairy cows were analyzed respectively．The results showed that: (1) Coccidia present in eight dairy cow farms in which the highest infection rate was 64.3% and the average infection rate was 28.7%;the infection rate of calves(under the age of one year), young dairy cows(1～2 years old )and adult dairy cows(over 2 years old)were 44.6%,25.6% and 14.6% respectively, The OPG(Oocysts per gram feces) values of faecal samples from calves ,young dairy cows and adult dairy cows were 3860,528 and 200 respectively. Nine species of Eimeria were identified as follows: 1.Eimeria zurnii(39.8%),2.Eimeria bovis(22.1%),3.Eimeria subspherica(11.0%),4.Eimeria ellipsoidalis(8.6%),5.Eimeria cylindriac(5.7%),6.Eimeria pellita(2.4%),7.Eimeria canadensis(7.0%),8 Eimeria alabamensis(2.6%),9.Eimeria bukidnonensis(0.7%). (2) Cryptosporidium oocysts were also detected in the feces of 55 dairy cows in the six dairy cow farms with the highest infective rate being 64.3 % , and the mean infectious rate being 20.8 % ,of which calves under the age of one year had a 33 % infectious rate much higher than that of 17.1% in the young dairy cows and 11.2% in the adult dairy cows. It was preliminarily identified as Cryptosporidium parvum.(3) the mixing infection involving Coccidia and Cryptosporidia were found in six dairy cow farms ,of which the highest mixing infection rate was 28.6% and the mean mixing infection rate was 10.6%.(4) The investigation outcomes revealed that there were differences in dairy cows infected with both Coccidium and Cryptosporidium between ages and areas. The simple or mixed parasitical infections may exist in the dairy cows and both of the infection rate and intensity were evidently higher in the calves than in the other two groups of cows. Those had a higher Coccidium and Cryptosporidium infection rate and intensity also had obviously clinical symptoms such as diarrhea and feces with blood . As a result, comprehensive measures of preventing the above mentioned two kinds of parasitoses should be the first of all choices.