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| Permin, A.; Ambrosen, T.; Maag Eigaard, N.; Folden Fensburg, M.; Bojesen, M.; Christensen, J.P.; Bisgaard, M.. |
| Siden anden verdenskrig er der sket store ændringer i fjerkræproduktionen. Indførslen af nye produktionssystemer, robuste og højtydende dyr, forbedret management og indførslen af biosecurity har medført en stor produktionsfremgang med lav mortalitet. I de senere år har forbrugerønsker medført at udvikling af udendørs produktionssystemer, hvor de klassiske fjerkræsygdomme nu er på fremmarch med en forhøjet mortalitet til følge. Forfatterne diskuterer, om de udendørs produktionssystemer reelt har betydet en forbedret velfærd for hønerne. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Health and welfare. |
| Ano: 2002 |
URL: http://orgprints.org/1877/1/DVTSygd_velf.pdf |
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| Maag Eigaard, N.; Permin, A.; Christensen, J.P.; Bisgaard, M.. |
| Longitudinal investigations on causes of mortality were carried out at one organic layer farm with four flocks of Lohman Brown and Lohman White chickens producing table eggs. All flocks were housed separately. One flock of each breed were followed from September 2001 to August 2002. Post mortem examinations were performed on a total of 16% of the dead chickens over the entire period. Of these 346 (96%) of the Lohmann Brown and 315 (91%) of the Lohmann White chickens were subjected for bacteriology. High mortality rates, 91% and 63% were observed in Lohman Brown and Lohman White chickens, respectively and were found to be due to infections with mainly Pasteurella multocida, Erysipelothix rhusiopathia and Escherichia coli. E. rhusiopathia, P. multocida and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Health and welfare. |
| Ano: 2003 |
URL: http://orgprints.org/1878/1/Denver_2003_endelig_version.pdf |
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| Dahl, C.; Permin, A.; Christensen, J.P.; Bisgaard, M.; Muhairwa, A.P; Petersen, K.M.; Poulsen, J.S.; Jensen, A.L.. |
| Pasteurella multocida and Ascaridia galli are observed with high prevalences in free range chickens in Denmark, but the impact is unknown. A study was carried out to examine the interaction between A. galli and P. multocida in chickens and the impact on production. Five groups, each with 20 18-week-old Lohmann Brown chickens were infected. Group I was orally infected with 1000 +/- 50 embryonated A. galli eggs. Group 2 received 10(4) cfu p. multocida intratracheally. Group 3 was infected with A. galli and subsequently with P. multocida. Group 4 was infected with P. multocida followed by A. galli. Group 5 was the control. The study ran for I I weeks where clinical manifestations, weight gain and egg production were recorded. Excretion of P. multocida was... |
| Tipo: Journal paper |
Palavras-chave: Health and welfare. |
| Ano: 2002 |
URL: http://orgprints.org/1857/1/The_effect_of_concurrent_infections_with_Pasteurella_multocida_and_Ascaridia_galli_on_free_range_chickens.pdf |
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| Schou, T.; Permin, A.; Roepstorff, A.; Sorensen, P.; Kjaer, J.. |
| 1. The objective of the study was to compare the establishment and effect of Ascaridia galli infections in 4 different layer-lines. 2. A total of 160 birds comprising 4 different commercial layer-lines, ISA Brown, New Hampshire, Skalborg and a cross of New Hampshire(NH) and Skalborg (Sk), were infected with A. galli eggs. The birds were examined for the presence of parasite eggs and parasites at weeks 3, 6 and 9 post infection (pi). 3. At week 6 pi the chickens of the NH line harboured more larvae compared with the three other lines. The Sk line chickens excreted more A. galli eggs throughout the study compared with the other lines. Female worms in the Sk line were more fecund than the worms in the other lines. Male and female worms recovered from the Sk... |
| Tipo: Journal paper |
Palavras-chave: Health and welfare. |
| Ano: 2003 |
URL: http://orgprints.org/1858/1/Comparative_genetic_resistance.pdf |
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| Eigaard, N.M.; Permin, A.; Christensen, J. P.; Bojesen, A.M.; Bisgaard, M.. |
| Detailed longitudinal studies of the genetic stability of Pasteurella multocida ssp. multocida, the cause of fowl cholera, have not previously been carried out. Consequently, the aim of the present study was to provide detailed information on the genetic stability and diversity of P. multocida ssp. multocida in poultry flocks over time enabling new insight concerning the molecular epidemiology of this important poultry pathogen. Longitudinal investigations of the rate and causes of mortality were carried out on two free-range layer farms (A and B) over a period of 11 months. The total mortality of two flocks, A1 and A2, on farm A were 62% and 91%, respectively, while the total mortality of a single flock B1 on farm B was 6%. Postmortem examinations were... |
| Tipo: Journal paper |
Palavras-chave: Health and welfare. |
| Ano: 2006 |
URL: http://orgprints.org/9796/1/9796.pdf |
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