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51. Milk fever and subclinical hypocalcaemia

Author

Houe, H., Jørgensen, R.J., Larsen, Torben, Østergaard, Søren, Sørensen, Jan Tind, Agger, J.F., Thilsing-Hansen, T., and Blom, J.Y.

Published
1999

53. Contributions to variability of Clinical Measures for use as Indicators of Udder Health Status in a Clinical Protocol

Author

Fossing, C., Vaarst, M., Houe, H., Enevoldsen, C., Fossing, C., Vaarst, M., Houe, H., and Enevoldsen, C.

Abstract

A cross-sectional observational study with repeated observations was conducted on 16 Danish dairy farms to quantify the influence of observer, parity, time (stage in lactation) and farm on variables routinely selected for inclusion in clinical protocols, thereby to enable a more valid comparison of udder health between different herds. During 12 months, participating herds were visited 5 times by project technicians, who examined 20 cows and scored the selected clinical variables. The estimates of effect on variables were derived from a random regression model procedure. Statistical analyses revealed that, although estimates for occurrence of several the variables, e.g. degree of oedema, varied significantly between observers, the effects on many of these estimates were similar in size. Almost all estimates for occurrences of variables were significantly affected either parity and lactation stage, or by both e.g. udder tissue consistency. Some variables, e.g. mange, had high estimates for the farm component, and others e.g. teat skin quality had a high individual component. Several of the variables, e.g. wounds on warts, had a high residual component indicating that a there still was a major part of the variation in data, which was unexplained. It was concluded that most of the variables were relevant for implementation in herd health management, but that adjustments need to be made to improve reliability.

Published
2006

58. Biosecurity in 116 Danish fattening swineherds: descriptive results and factor analysis

Author

Boklund, Anette, Alban, L., Mortensen, Sten, Houe, H., Boklund, Anette, Alban, L., Mortensen, Sten, and Houe, H.

Abstract

Biosecurity measures are important for the herd's protection against diseases and also to provide nationwide protection against the introduction of exotic diseases. In this paper, we describe the farmers’ choices and routines regarding biosecurity in Danish fattening herds.Overall, 116 Danish swine fattening herds in three areas of different pig density were interviewed.Of these herds, 78% purchased weaners from one sow herd only, whereas 10% purchased from >5 sow herds during 1 year. Large herds (>500 finishers) purchased weaners more often than smaller herds (≤500 finishers). Only two swine producers purchased weaners from a market. Almost all herds (95%) received weaners from one sow herd at one time, and only one herd received from >5 sow herds in one batch. Twenty-one percent did not use an effective barrier between the loading area and the stables when delivering pigs for slaughter. Entry rooms (in which clothing and boots are changed) were common at the farm, and the numbers of visitors were generally low ( 3.10). A site scoring high on factor 1 was a large SPF herd, which received weaners from a single source, had biosecurity requirements for the transport vehicles, and had a high level of biosecurity for visitors. A site scoring high on factor 2 was a multi-site farm, which had personnel working on more than one of the sites, only received weaners from one sow herd, had delivering herds placed close to the participating site, and transported animals themselves. A site scoring high on factor 3 was a site which hired commercial transport for slaughter, was situated far from the abattoir and had a high level of biosecurity when loading pigs. A production site scoring high on factor 4 was a large site, which used all-in/all-out management, washed and disinfected between each group, and purchased many weaners.

Published
2004

62. Appendix A:Biostatistics

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, and Toft, Nils

Published
2003

63. Evaluating diagnostics tests

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Søren Saxmose, Houe, Hans, Ersbøll, Annette Kjær, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Søren Saxmose, Houe, Hans, Ersbøll, Annette Kjær, and Toft, Nils

Published
2003

64. Hypotheses, study outcome and determinants

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Søren Saxmose, Houe, Hans, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Søren Saxmose, and Houe, Hans

Published
2003

66. Biosecurity in 121 Danish sow herds

Author

Boklund, Anette, Mortensen, Sten, Houe, H., Boklund, Anette, Mortensen, Sten, and Houe, H.

Abstract

Herds are under constant risk of introducing new pathogens from different sources. In this article we describe biosecurity practices in Danish sow herds. Between December 1, 1999 and February 29, 2000, 121 sow units were interviewed regarding biosecurity on the site. The questionnaire contained 62 questions. The 121 units were situated in three areas with different swine densities. Sow units were described by their sizes (units with >110 sows were regarded as large herds) and health status (SPF herds or conventional herds). Of the 121 sow herds, 63 (52%) sold weaners. Most sow units (71%) used delivery facilities for the picking up of weaners, but half of these did not have a barrier between the loading area and the stable while loading. In 19% of the units, weaners were picked up directly from the stable, and in 10% the truck driver had access to the stables. Most units required the vehicle to be cleaned (16%) or cleaned and disinfected (48%) before the transport; large sites and SPF sites more often required stricter biosecurity measures, for example a quarantine period before the transport of weaners.

Published
2003

72. Questionnaires:chapter 12

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Annette Cleveland, Agger, Jens Frederik Gramstrup, Ersbøll, Annette Kjær, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Annette Cleveland, Agger, Jens Frederik Gramstrup, and Ersbøll, Annette Kjær

Published
2002

74. Bias and interaction:chapter 11

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Bruun, Jeanett, Flensburg, Mimi Folden, Ersbøll, Annette Kjær, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Bruun, Jeanett, Flensburg, Mimi Folden, and Ersbøll, Annette Kjær

Published
2002

76. Observational studies:chapter 4

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, Toft, Nils, Bruun, Jeanett, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, Toft, Nils, and Bruun, Jeanett

Published
2002

77. Measures of disease fequency:chapter 6

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Toft, Nils, Agger, Jens Frederik Gramstrup, Houe, Hans, Bruun, Jeanett, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Toft, Nils, Agger, Jens Frederik Gramstrup, Houe, Hans, and Bruun, Jeanett

Published
2002

79. Sample size and sampling methods:chapter 8

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Toft, Nils, Houe, Hans, Nielsen, Søren Saxmose, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Toft, Nils, Houe, Hans, and Nielsen, Søren Saxmose

Published
2002

80. Evaluating tests used in veterinary medicine:chapter 9

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Søren Saxmose, Houe, Hans, Ersbøll, Annette Kjær, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Nielsen, Søren Saxmose, Houe, Hans, Ersbøll, Annette Kjær, and Toft, Nils

Published
2002

81. Introduction to veterinary epidemiology:chapter 1

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Agger, Jens Frederik Gramstrup, Houe, Hans, Ersbøll, Annette Kjær, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Agger, Jens Frederik Gramstrup, Houe, Hans, Ersbøll, Annette Kjær, and Toft, Nils

Published
2002

82. Nature of data for epidemiological studies:chapter 3

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Houe, Hans, Ersbøll, Annette Kjær, Nielsen, Liza Rosenbaum, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Houe, Hans, Ersbøll, Annette Kjær, and Nielsen, Liza Rosenbaum

Published
2002

84. Measures of association and effect:chapter 7

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Toft, Nils, Agger, Jens Frederik Gramstrup, Bruun, Jeanett, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Toft, Nils, Agger, Jens Frederik Gramstrup, and Bruun, Jeanett

Published
2002

85. Data management:chapter 10

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Houe, Hans, Ersbøll, Annette Kjær, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Houe, Hans, Ersbøll, Annette Kjær, and Toft, Nils

Published
2002

86. Experimental studies:chapter 5

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, and Toft, Nils

Published
2002

87. Data analysis:chapter 13

Author

Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, Bruun, Jeanett, Nielsen, Annette Cleveland, Toft, Nils, Houe, H., Ersbøll, A. K., Toft, N., Agger, J. F., Ersbøll, Annette Kjær, Bruun, Jeanett, Nielsen, Annette Cleveland, and Toft, Nils

Published
2002

92. Age distribution of animals persistently infected with bovine virus diarrhea virus in twenty-two Danish dairy herds

Author

Houe, H

Subjects
animal diseases, Denmark, Incidence, Chronic Disease, Age Factors, Animals, Cluster Analysis, Bovine Virus Diarrhea-Mucosal Disease, Cattle, Research Article, Disease Outbreaks, Follow-Up Studies
Abstract

The objectives of this study were to compare the age distribution of animals persistently infected (PI) with bovine virus diarrhea virus (BVDV) in 12 herds with clinical BVD compared to ten herds without clinical BVD and to examine the incidence of PI calves born after the oldest PI animal. Blood samples from all animals were tested for bovine virus diarrhea virus and antibodies. In five herds, blood samples were obtained from calves born after the whole herd had been tested. All calves born by PI dams were also blood tested. In herds with clinical BVD the median age of PI animals was 248 days and in herds without clinical BVD the median age was 144 days. There was no significant difference between the age of PI animals in herds with clinical BVD compared to herds without clinical BVD (p = 0.48) suggesting similar epidemiology of the occurrences of PI animals in the two herd categories. Thereafter, all herds were used to study the incidence of PI animals. A total of 129 PI animals were found. In ten herds with 72 PI animals the age range of PI animals was more than six months. In these herds 26.3% of the PI animals were born within the first two months after birth of the oldest PI animal, no PI animals were born 2- less than 6 months, 52.7% were born 6- less than 14 months, 6.9% were born 14- less than 22 months and 13.9% (all born by PI dams) were born later than 22 months after the oldest PI animal.(ABSTRACT TRUNCATED AT 250 WORDS)

Published
1992

93. Bulk-tank milk ELISA antibodies for estimating the prevalence of paratuberculosis in Danish dairy herds

Author

Nielsen, S. S., Thamsborg, S. M., Houe, H., Bitsch, V., Nielsen, S. S., Thamsborg, S. M., Houe, H., and Bitsch, V.

Abstract

Paratuberculosis (Johne's disease) has been widespread in Danish dairy herds for a long time but the herd-level prevalence has never been determined precisely. To evaluate the prevalence of paratuberculosis in Danish dairy herds in various regions, an ELISA based on a commercially available antigen was adapted for testing bulk-tank milk for the presence of antibodies to Mycobacterium avium subsp. paratuberculosis. Bulk-tank milk samples were collected from six milk-collecting centres from six different areas of the country. Samples from 900 herds (about 7.5% of all Danish dairy herds) were examined, and 70% were positive at the statistically optimal cut-off (sensitivity 97.1%; specificity 83.3%). The technical performance of the ELISA was not sufficient to provide a tool for surveillance because even slight changes in optical density for the samples would change the classification of some samples. The infection is more widespread than previous investigations have shown. (C) 2000 Elsevier Science B.V.

Published
2000

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