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Devising an indicator to detect mid-term abortions in dairy cattle: a first step towards syndromic surveillance of abortive diseases.

Bronner A, Morignat E, Hénaux V, Madouasse A, Gay E, Calavas D - PLoS ONE (2015)

Bottom Line: On average, the weekly MAIR among heifers increased by 3.8% (min-max: 0.02-57.9%) when the mean number of BT8 cases that occurred in the previous 8 to 13 weeks increased by one.The weekly MAIR among parous cows increased by 1.4% (0.01-8.5%) when the mean number of BT8 cases occurring in the previous 6 to 12 weeks increased by one.These results underline the potential of the MAIR to identify an increase in mid-term abortions and suggest that it is a good candidate for the implementation of a syndromic surveillance system for bovine abortions.

View Article: PubMed Central - PubMed

Affiliation: ANSES-Lyon, Unité Epidémiologie, 31 avenue Tony Garnier, 69364 Lyon Cedex 07, France.

ABSTRACT
Bovine abortion surveillance is essential for human and animal health because it plays an important role in the early warning of several diseases. Due to the limited sensitivity of traditional surveillance systems, there is a growing interest for the development of syndromic surveillance. Our objective was to assess whether, routinely collected, artificial insemination (AI) data could be used, as part of a syndromic surveillance system, to devise an indicator of mid-term abortions in dairy cattle herds in France. A mid-term abortion incidence rate (MAIR) was computed as the ratio of the number of mid-term abortions to the number of female-weeks at risk. A mid-term abortion was defined as a return-to-service (i.e., a new AI) taking place 90 to 180 days after the previous AI. Weekly variations in the MAIR in heifers and parous cows were modeled with a time-dependent Poisson model at the département level (French administrative division) during the period of 2004 to 2010. The usefulness of monitoring this indicator to detect a disease-related increase in mid-term abortions was evaluated using data from the 2007-2008 episode of bluetongue serotype 8 (BT8) in France. An increase in the MAIR was identified in heifers and parous cows in 47% (n = 24) and 71% (n = 39) of the departements. On average, the weekly MAIR among heifers increased by 3.8% (min-max: 0.02-57.9%) when the mean number of BT8 cases that occurred in the previous 8 to 13 weeks increased by one. The weekly MAIR among parous cows increased by 1.4% (0.01-8.5%) when the mean number of BT8 cases occurring in the previous 6 to 12 weeks increased by one. These results underline the potential of the MAIR to identify an increase in mid-term abortions and suggest that it is a good candidate for the implementation of a syndromic surveillance system for bovine abortions.

No MeSH data available.


Related in: MedlinePlus

Distribution of départements according to their weighted mean of time lags ℓmij and kmij.Each graph represents the distribution of the 51 départements (among heifers, Fig. 4A, on the left) and 55 départements (among parous cows, Fig. 4B, on the right) depending on their weighted mean of time lags ℓmij and kmij. Time lags ℓ̅j and k̅j averaged among départements are also plotted (black triangle).
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pone.0119012.g004: Distribution of départements according to their weighted mean of time lags ℓmij and kmij.Each graph represents the distribution of the 51 départements (among heifers, Fig. 4A, on the left) and 55 départements (among parous cows, Fig. 4B, on the right) depending on their weighted mean of time lags ℓmij and kmij. Time lags ℓ̅j and k̅j averaged among départements are also plotted (black triangle).

Mentions: The effect of the mean number of BT8 cases computed over département-specific time intervals showed an increase in the MAIR in 47% out of the 51 départements among heifers and 71% out of the 55 départements among parous cows (Table 1 and Fig. 3). It showed an increase in the MAIR in 18 départements among both groups of females, as illustrated by the Aisne département (Fig. 2A and 2B). Among heifers, the mean of weighted time lags ranged from 0 to 22 weeks for and from 0 to 20 weeks for among départements (Fig. 4); weighted mean of time intervals varied from 0 to 15 weeks. Among parous cows, the mean of weighted time lags ranged from 0 to 22 weeks for and for 0 to 19 weeks for among départements (Fig. 4); weighted mean of time intervals varied from 0 to 14 weeks.


Devising an indicator to detect mid-term abortions in dairy cattle: a first step towards syndromic surveillance of abortive diseases.

Bronner A, Morignat E, Hénaux V, Madouasse A, Gay E, Calavas D - PLoS ONE (2015)

Distribution of départements according to their weighted mean of time lags ℓmij and kmij.Each graph represents the distribution of the 51 départements (among heifers, Fig. 4A, on the left) and 55 départements (among parous cows, Fig. 4B, on the right) depending on their weighted mean of time lags ℓmij and kmij. Time lags ℓ̅j and k̅j averaged among départements are also plotted (black triangle).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4352010&req=5

pone.0119012.g004: Distribution of départements according to their weighted mean of time lags ℓmij and kmij.Each graph represents the distribution of the 51 départements (among heifers, Fig. 4A, on the left) and 55 départements (among parous cows, Fig. 4B, on the right) depending on their weighted mean of time lags ℓmij and kmij. Time lags ℓ̅j and k̅j averaged among départements are also plotted (black triangle).
Mentions: The effect of the mean number of BT8 cases computed over département-specific time intervals showed an increase in the MAIR in 47% out of the 51 départements among heifers and 71% out of the 55 départements among parous cows (Table 1 and Fig. 3). It showed an increase in the MAIR in 18 départements among both groups of females, as illustrated by the Aisne département (Fig. 2A and 2B). Among heifers, the mean of weighted time lags ranged from 0 to 22 weeks for and from 0 to 20 weeks for among départements (Fig. 4); weighted mean of time intervals varied from 0 to 15 weeks. Among parous cows, the mean of weighted time lags ranged from 0 to 22 weeks for and for 0 to 19 weeks for among départements (Fig. 4); weighted mean of time intervals varied from 0 to 14 weeks.

Bottom Line: On average, the weekly MAIR among heifers increased by 3.8% (min-max: 0.02-57.9%) when the mean number of BT8 cases that occurred in the previous 8 to 13 weeks increased by one.The weekly MAIR among parous cows increased by 1.4% (0.01-8.5%) when the mean number of BT8 cases occurring in the previous 6 to 12 weeks increased by one.These results underline the potential of the MAIR to identify an increase in mid-term abortions and suggest that it is a good candidate for the implementation of a syndromic surveillance system for bovine abortions.

View Article: PubMed Central - PubMed

Affiliation: ANSES-Lyon, Unité Epidémiologie, 31 avenue Tony Garnier, 69364 Lyon Cedex 07, France.

ABSTRACT
Bovine abortion surveillance is essential for human and animal health because it plays an important role in the early warning of several diseases. Due to the limited sensitivity of traditional surveillance systems, there is a growing interest for the development of syndromic surveillance. Our objective was to assess whether, routinely collected, artificial insemination (AI) data could be used, as part of a syndromic surveillance system, to devise an indicator of mid-term abortions in dairy cattle herds in France. A mid-term abortion incidence rate (MAIR) was computed as the ratio of the number of mid-term abortions to the number of female-weeks at risk. A mid-term abortion was defined as a return-to-service (i.e., a new AI) taking place 90 to 180 days after the previous AI. Weekly variations in the MAIR in heifers and parous cows were modeled with a time-dependent Poisson model at the département level (French administrative division) during the period of 2004 to 2010. The usefulness of monitoring this indicator to detect a disease-related increase in mid-term abortions was evaluated using data from the 2007-2008 episode of bluetongue serotype 8 (BT8) in France. An increase in the MAIR was identified in heifers and parous cows in 47% (n = 24) and 71% (n = 39) of the departements. On average, the weekly MAIR among heifers increased by 3.8% (min-max: 0.02-57.9%) when the mean number of BT8 cases that occurred in the previous 8 to 13 weeks increased by one. The weekly MAIR among parous cows increased by 1.4% (0.01-8.5%) when the mean number of BT8 cases occurring in the previous 6 to 12 weeks increased by one. These results underline the potential of the MAIR to identify an increase in mid-term abortions and suggest that it is a good candidate for the implementation of a syndromic surveillance system for bovine abortions.

No MeSH data available.


Related in: MedlinePlus