Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Ograniczanie wyników
Czasopisma help
Lata help
Autorzy help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 101

Liczba wyników na stronie
first rewind previous Strona / 6 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  enzootyczna bialaczka bydla
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 6 next fast forward last
EN
The purpose of the work was to assess the results of relieving cows from bovine enzootic leukaemia taking into account some laboratory tests, ie agar gel diffusion test, ELISA and syncytial test. In the Wrocław district immunodiffusion testing was introduced to standard practice in 1982. Up to 1990 only a small number of animals (9-14%) were evaluated for leukaemia and the percentage of positive seroreactions ranged from 27-7%. The process of the spreading of the EBL virus at that time was significant and was confirmed by positive results of the virus isolation from the peripheral blood of cows and calves coming from herds being treated for enzootic leukaemia. In 1991-1995 mass serological examinations involved the majority of cattle and the percentage of positive results declined to 5.8% in 1991 and 1.67% in 1995. In light of the findings the best results were obtained when the serological tests were introduced as obligatory ones and the cost of the studies were covered by Ministry of Agriculture.
EN
On the basis of post-slaughter examinations there was assessed the dynamics of the nodular form of enzootic bovine leukaemia (EBL) occurrence in the Lower Salesia region in 1960—1974 and its distribution in Poland in 1984. There was paid attention to the reasons of EBL spreading, the percentage of infections in large-scale cowsheds, the relationship between the age of animals and the degree of a herd infection, and some problems associated with the control of the disease. In 36 large-scale cowsheds there were assessed 4499 cows using the AGID test. The index of infection in individual herds ranged from 12 to 82%. The process of cowsheds recovery was based on the healthy system of calves and heifers breeding. Calves, fed colostrum taken from their own mothers, were separated from udalt cows and fed milk-replacement liquids. The first serological assessments were performed in calves aged 4 months, that permitted for a quick elimination of infected animals. Consecutive examinations were carried out every 4 months until the recevery of a herd was stated.
EN
Every member country of the European Union has to prepare current eradication programs of bovine leukaemia that will enable the elimination of the disease from infected herds. At the end of the year 2005 in Poland more than 20 000 cattle were infected with BLV, that were not bought and paid by Veterinary Inspection because of the lack of financial resources. Such a situation has been observed for years. Without the realisation of the elimination from the market of serologically positive animals it makes no sense to continue the field of research and bovine leukaemia eradication programs. Furthermore it is against the rules and directives referring to BLV eradication. However there is a possibility of a partial refund of invested sources from the European Commission, under the condition of own financial sources guarantied by the Ministry Council. With a sufficient level of budgetary financial support, initially 6 of the 16 voivodeships in Poland could become free from BLV infections. With own financial support and EU funds the eradication program of bovine leukaemia in Poland can last for about 4-5 years.
EN
Serological studies were carried out using two kinds of antigens i.e. BLV and BLV plus parainfluenza virus (PI3) propagated in FLK cells. Out of 38 cattle sera sixteen (42.2 per cent) produced positive results with the BLV antigen and 31 (81.6 per cent) with the mixed antigen. The findings showed that with the mixed antigen the positive results rose by 39.4.
EN
Epizootiological analysis for the occurrence of enzootic bovine leukaemia (EBL) performed on 35 660 cattle in private farms situated in the Wrocław region showed that 5% of the animals were positive. In 1992 EBL was diagnosed in only 34 out of 98 farms by the AGID test in which in 1988-1990 a nodular form of leukaemia was found. Farms with large herds serve as a reservoir of BLV because about 47% serologically confirmed cases of EBL in private farms were connected with purchasing cattle from such farms. The frequency of EBL was twice as high in the regions where the same veterinary staff serviced both the private and state farms compared to regions where the veterinary staff exclusively serviced private farmers. These observations point to a iatrogenic route of BLV transmission.
RU
В настоящей работе представлен вариант борьбы с ЭЛС, заключающийся в образовании коровников из серологически отрицательных коров из разных объектов того же самого предприятия, показатель инфекции BLV в которых составлял 40—60%. Серологические исследования с применением теста АРID провели в хозяйстве „Cz”, имеющем 2 коровника с общим поголовьем ок. 160 молочных коров. В первом исследовании получили положительные результаты у 62,4 и 43,5% коров. Инфицированных коров поместили в один коровник, а коров с отрицательными серологическими результатами подвергли дальнейшему лечению во втором объекте. Очередные контрольные исследования в оздоравливаемом коровнике выполняли в 2—6-месячных интервалах. Серологически положительных коров каждый раз удаляли немедленно после получения результатов, н на их место вводили стельных телок с по крайней мере 2-кратным отрицательным результатом серологического исследования. За 4 года получили понижение процента инфекций BLV до 1.5—2,5%. Притом положительные результаты в последний год освобождения коровника от ЭЛС отмечали лишь у нововведенных коров-первотелок. Авторы считают, что в многообъектных хозяйствах путем строгой изоляции инфицированных животных и соблюдения санитарного режима можно в течение 4—5 лет освободить стада от ЭЛС.
EN
The work presents a variant of realising farms from enzootic bovine leukosis consisting in the formation of herds on the ground of negative serological results in cows derived from different cowsheds of the same breeding centre. The rate of infection ranged from 40 to 60 per cent. Serological test were perfomed using agar diffusion technique (AGID) in a farm „Cz” comprising two cowsheds with 166 milking cows. In the first trial positive reactions were noted in 62.4 per cent and 43.5 per cent, respectively. Infected cows were placed in one cowshed and those with serologically negative results in the second one. The animals of the latter cowshed were tested at intervals of 2—6 months. The cows with specific antibodies against EBL were being transferred and new calving cows with serologically negative results were being intoduced. Within four years the percentage of infections decreased to 1.5—2.5 per cent. The presence of specific antibodies was found in the 4th year only in primigravidas introduced. The authors are of opinion that within 4—5 years farms may be realised from EBL if strict sanitary rules are imposed.
RU
Исследования провели с применением теста AGID. В 2 коровниках, насчитывающих 75 и 47 коров, получили в первом исследовании 10% и 8% положительных серологических результатов. Дальнейшие исследования выполняли в 4—6-месячных интервалах. Животных, зараженных BLV, удаляли немедленно из коровника. На второй год освобождения стада от ЭЛС у всех животных получили отрицательные результаты. В коровниках молочного скота при проценте инфекций до 10% можно в течение 2 лет посредством систематических исследований довести до освобождения стада от ЭЛС при условии его пополнения телками, освободными от лейкоза. Вариант освобождения крупных коровников от ЭЛС, состоящий в изоляции инфицированных коров в выделенном секторе того же самого коровника, осуществляли в хозяйстве насчитывающем 377 молочных коров. В первом исследовании получили 22% положительных серологических результатов. В очередных контрольных исследованиях обнаруживали новые инфекции BLV у коров в излечиваемых секторах. В течение 4 лет освободили этим путем коровник от ЭЛС.
EN
The examinations using the AGID test were carried out on two cowsheds comprising 75 and 47 cows, respectively. The first testing revealed positive reactors in 10% of animals and 8% in the second cowsed. Further examinations were conducted at intervals of 4—6 months and the animals with positive seroconversion were removed from the premises. In the second year no animal showed the presence of antibody against EBL virus. The authors conclude that in cowsheds comprising milking cattle and in which not more than 10% of animals is infected with EBL virus, it is possible to release cowsheds from EBL within two years provided that cows are tested regularly and a cowshed is completed by heifers free from EBL. In case of large farms comprising hundreds animals the situation is much more complicated: e.g. on a farm containing 377 cows the first examination discovered the presence of specific antibodies in 22% of animals. All the milking cows were haused in the same premises; though the infected animals were in isolation nevertheless new infections were found in repeated examinations. At last after four vears the farm was free from EBL that was reached by elimination the seropositive animals.
first rewind previous Strona / 6 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.