Peculiarities of the epizootic process in strongylatosis of the gastrointestinal tract of sheep and evaluation of the quality of mutton
The article is devoted to the study of the peculiarities of the epizootic process in strongylatosis of the gastrointestinal tract of sheep and the assessment of the quality of mutton in mixed helminthiasis. The work on the study of the helminthofauna of strongylates was carried out on sheep farms of the Kursk region. In order to study the spreading of strogilatoses, the research of helminthic and larvoscopic of feces from 1754 sheep was carried out. The abomasum and intestines of 126 sheep of different ages were subjected to the complete helminthological autopsy. The authors report that strongylatoses of the digestive tract of sheep are widely spread in the Kursk region. Up to 92% of sheep of all ages are infected with a combination of strongylates of various species. 13 species of strongylates from 8 kinds have been registered on sheep farms. Representatives of the genera Ostertagia, Trichostrongylus and Nematodir dominate. It is revealed that the distribution of the number of parasites in the host population is overdispersed, the majority of sheep are infected with an insignificant number of strongylates, and the main part of helminths is concentrated in a relatively small number of hosts. The dynamics of infection of sheep of different ages and isolation of strongylates eggs were studied. Data on the sex ratio of strongylates parasitic on sheep, depending on the season of the year, are given. The research results confirm that in recent years the tendency of infection of sheep with trichostrongilus is increased. In more than 30% of cases, mixed invasion by various types of helminthes is registered. At the same time, dicroceliotic-strongylatous invasion, fasciolous-strongylatous and combined invasion with strongylates and thinnecked cysticercus are of the greatest spread. Associative invasion has a pronounced negative impact on the quality of mutton. By assessing the quality of mutton, it was found that only 27.26% of sheep with mixed helminthiasis belong to the 1st category of fatness, 72.8% belong to the 2nd category. Mutton obtained from sheep with mixed helminthiasis, fresh meat, has no differences with the meat of non-invasive animals. After 72 hours of storage, mutton of the 2nd category of fatness has a dubious reaction to peroxidase and with copper sulfate, the pH indicator is in the range of 6.1-6.2. The total number of microorganisms (CFU / g) exceeds the standard by two orders of magnitude after 5 days of storage. The slaughter output of carcasses of the 1st and 2nd categories of fatness from sheep infested with different types of helminths with a high intensity of invasion by strongylates is less by 1.8% and 5.4%, respectively, than in the group of non-invasive animals.