Limits...
Demographics of cattle positive for Mycobacterium avium subspecies paratuberculosis by faecal culture, from submissions to the Cork Regional Veterinary Laboratory.

Richardson E, Mee J, Sánchez-Miguel C, Crilly J, More S - Ir Vet J (2009)

Bottom Line: Although the study area is restricted, it includes the most intensive (and economically-important) dairy region in Ireland.The demographics of JD infection from the study area are in agreement with international reports.It is hoped this work may contribute to the development of a surveillance strategy for MAP by regional veterinary laboratories.

View Article: PubMed Central - HTML - PubMed

Affiliation: Moorepark Dairy Production Research Centre, Teagasc, Fermoy, Co, Cork, Ireland. richardson.esther@gmail.com.

ABSTRACT
The demography of bovine infections caused by Mycobacterium avium subspecies paratuberculosis (MAP) in Ireland is poorly defined. The objective of this study was to describe the demographics of cattle positive to MAP on faecal culture, based on submissions to the Cork Regional Veterinary Laboratory (Cork RVL) from 1994 to 2006. The study focused on all available faecal samples from adult cattle with non-responsive chronic diarrhoea that were submitted by private veterinary practitioners to Cork RVL for MAP culture. For each MAP-positive by faecal culture animal, data were collated from Cork RVL and Cattle Movement Monitoring Scheme (CMMS) records. Johne's disease (JD) was confirmed in 110 animals from 86 herds by the Cork RVL between 1994 and 2006, with a rate of positive cases between 15% and 18% over last four years of the study. Two breeds (Holstein/Friesian or Limousin) made up 78% of submissions. Movements were assessed for the 57 study animals with available movement information, 90% died within one year of the test and 26% tested positive in the herd they were born into. The study provides preliminary information about movement trends and demographics of animals with MAP positive submissions. Although the study area is restricted, it includes the most intensive (and economically-important) dairy region in Ireland. The demographics of JD infection from the study area are in agreement with international reports. Further work is required to determine demographic trends, incidence and prevalence of JD throughout Ireland. It is hoped this work may contribute to the development of a surveillance strategy for MAP by regional veterinary laboratories.

No MeSH data available.


Related in: MedlinePlus

Network diagram of the relationships between MAP-culture positive animals (study animals) and test locations. The number beside each study animal (red dot) indicates the year of birth. The number beside each farm (blue dot) refers to the number of animals on that farm that tested positive. Arrows indicate the direction of movement of study animals. Three reference groups (A, B, C) highlight movement trends in the network, including the movement of multiple positive animals from a single infected herd (A), a study (positive) animal moving through farms before testing positive and moving to a factory or knackery (B; grey and black dots, respectively), and imported animals testing positive in Irish herds(C).
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3113751&req=5

Figure 5: Network diagram of the relationships between MAP-culture positive animals (study animals) and test locations. The number beside each study animal (red dot) indicates the year of birth. The number beside each farm (blue dot) refers to the number of animals on that farm that tested positive. Arrows indicate the direction of movement of study animals. Three reference groups (A, B, C) highlight movement trends in the network, including the movement of multiple positive animals from a single infected herd (A), a study (positive) animal moving through farms before testing positive and moving to a factory or knackery (B; grey and black dots, respectively), and imported animals testing positive in Irish herds(C).

Mentions: The pattern of lifetime movements for the 54 animals is presented in Figure 5. In network analysis a component is each group of connected nodes (data points). The 'main' component of a social network is much larger than the next largest component [21], and in this analysis a main component was identified, linking 39 of the study animals and included 91% of recorded animal movements in the data set. Limousin animals were the predominant breed in the main component of the social network. The remaining 15 animals not in the main component were linked either through smaller components (two groups of three linked animals, two groups of two linked animals) or did not have any movements in common with other study animals (five animals). In Figure 5, three reference groups which highlight movements of interest in the network are outlined; the outward movement of multiple positive animals from a single source herd (A), the movement of positive animals from the source herd into a subsequent herd where they tested positive and then moved to a factory or knackery (B: this pattern was frequently observed), and imported animals entering the network of Irish herds before testing positive (C: this was observed on five occasions in the network as the remaining seven imported animals either did not have tags reported, or traceable tags). Many of the study animals were connected through outward movements from two source herds and through inward movements to two knackeries and a factory. Few animals were diagnosed at their herd of origin.


Demographics of cattle positive for Mycobacterium avium subspecies paratuberculosis by faecal culture, from submissions to the Cork Regional Veterinary Laboratory.

Richardson E, Mee J, Sánchez-Miguel C, Crilly J, More S - Ir Vet J (2009)

Network diagram of the relationships between MAP-culture positive animals (study animals) and test locations. The number beside each study animal (red dot) indicates the year of birth. The number beside each farm (blue dot) refers to the number of animals on that farm that tested positive. Arrows indicate the direction of movement of study animals. Three reference groups (A, B, C) highlight movement trends in the network, including the movement of multiple positive animals from a single infected herd (A), a study (positive) animal moving through farms before testing positive and moving to a factory or knackery (B; grey and black dots, respectively), and imported animals testing positive in Irish herds(C).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3113751&req=5

Figure 5: Network diagram of the relationships between MAP-culture positive animals (study animals) and test locations. The number beside each study animal (red dot) indicates the year of birth. The number beside each farm (blue dot) refers to the number of animals on that farm that tested positive. Arrows indicate the direction of movement of study animals. Three reference groups (A, B, C) highlight movement trends in the network, including the movement of multiple positive animals from a single infected herd (A), a study (positive) animal moving through farms before testing positive and moving to a factory or knackery (B; grey and black dots, respectively), and imported animals testing positive in Irish herds(C).
Mentions: The pattern of lifetime movements for the 54 animals is presented in Figure 5. In network analysis a component is each group of connected nodes (data points). The 'main' component of a social network is much larger than the next largest component [21], and in this analysis a main component was identified, linking 39 of the study animals and included 91% of recorded animal movements in the data set. Limousin animals were the predominant breed in the main component of the social network. The remaining 15 animals not in the main component were linked either through smaller components (two groups of three linked animals, two groups of two linked animals) or did not have any movements in common with other study animals (five animals). In Figure 5, three reference groups which highlight movements of interest in the network are outlined; the outward movement of multiple positive animals from a single source herd (A), the movement of positive animals from the source herd into a subsequent herd where they tested positive and then moved to a factory or knackery (B: this pattern was frequently observed), and imported animals entering the network of Irish herds before testing positive (C: this was observed on five occasions in the network as the remaining seven imported animals either did not have tags reported, or traceable tags). Many of the study animals were connected through outward movements from two source herds and through inward movements to two knackeries and a factory. Few animals were diagnosed at their herd of origin.

Bottom Line: Although the study area is restricted, it includes the most intensive (and economically-important) dairy region in Ireland.The demographics of JD infection from the study area are in agreement with international reports.It is hoped this work may contribute to the development of a surveillance strategy for MAP by regional veterinary laboratories.

View Article: PubMed Central - HTML - PubMed

Affiliation: Moorepark Dairy Production Research Centre, Teagasc, Fermoy, Co, Cork, Ireland. richardson.esther@gmail.com.

ABSTRACT
The demography of bovine infections caused by Mycobacterium avium subspecies paratuberculosis (MAP) in Ireland is poorly defined. The objective of this study was to describe the demographics of cattle positive to MAP on faecal culture, based on submissions to the Cork Regional Veterinary Laboratory (Cork RVL) from 1994 to 2006. The study focused on all available faecal samples from adult cattle with non-responsive chronic diarrhoea that were submitted by private veterinary practitioners to Cork RVL for MAP culture. For each MAP-positive by faecal culture animal, data were collated from Cork RVL and Cattle Movement Monitoring Scheme (CMMS) records. Johne's disease (JD) was confirmed in 110 animals from 86 herds by the Cork RVL between 1994 and 2006, with a rate of positive cases between 15% and 18% over last four years of the study. Two breeds (Holstein/Friesian or Limousin) made up 78% of submissions. Movements were assessed for the 57 study animals with available movement information, 90% died within one year of the test and 26% tested positive in the herd they were born into. The study provides preliminary information about movement trends and demographics of animals with MAP positive submissions. Although the study area is restricted, it includes the most intensive (and economically-important) dairy region in Ireland. The demographics of JD infection from the study area are in agreement with international reports. Further work is required to determine demographic trends, incidence and prevalence of JD throughout Ireland. It is hoped this work may contribute to the development of a surveillance strategy for MAP by regional veterinary laboratories.

No MeSH data available.


Related in: MedlinePlus