Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor
The purpose of the present study was to investigate the cow-level association between acute hoof lesions and the somatic milk cell count in dairy cattle. Cows from three loose-housed Swedish dairy herds were enrolled in the study if they had an acute hoof lesion treated by a veterinarian or professi...
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| Formato: | L3 |
| Lenguaje: | sueco Inglés |
| Publicado: |
SLU/Dept. of Animal Environment and Health (until 231231)
2005
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| Materias: |
| _version_ | 1855571736778506240 |
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| author | Lilja-Helmersson, Frank |
| author_browse | Lilja-Helmersson, Frank |
| author_facet | Lilja-Helmersson, Frank |
| author_sort | Lilja-Helmersson, Frank |
| collection | Epsilon Archive for Student Projects |
| description | The purpose of the present study was to investigate the cow-level association between acute hoof lesions and the somatic milk cell count in dairy cattle. Cows from three loose-housed Swedish dairy herds were enrolled in the study if they had an acute hoof lesion treated by a veterinarian or professional hoof trimmer during the preceding year, according to farmer records. Studied lesions were sole ulcer, dermatitis, interdigital necrobacillosis and hoof abscess, in each case causing lameness. For each hoof-diseased cow, 0 to 3 healthy cows were included, matched with respect to herd, breed, parity and lactation stage. Cell counts were obtained from monthly test recordings from one month before to three months after the hoof-lesion diagnosis, and log-transformed. In total, 203 cell-count observations from 14 hoof-diseased and 32 healthy cows were analysed using mixed least-squares multivariable regression modelling. A random effect for cow identity was included. The principal explanatory variable was disease month, coded as -1 the month before diagnosis, as 0 for the same month as diagnosis, as 1 or 2 for the corresponding number of months after diagnosis, and as 3 for 3 months after diagnosis and all observations in healthy cows. Predictors representing herd identity, breed, parity, lactation stage, milk yield, type of hoof lesion and season were tested but excluded in the final analysis because they were judged not to improve the model. Cows with an acute hoof lesion had a 2.1 times higher cell count the month before the diagnosis (P=0.002) and a 2.3 times higher cell count the same month as the diagnosis (P=0.005) compared to 3 months after the diagnosis and healthy cows. |
| format | L3 |
| id | RepoSLU10704 |
| institution | Swedish University of Agricultural Sciences |
| language | swe Inglés |
| publishDate | 2005 |
| publishDateSort | 2005 |
| publisher | SLU/Dept. of Animal Environment and Health (until 231231) |
| publisherStr | SLU/Dept. of Animal Environment and Health (until 231231) |
| record_format | eprints |
| spelling | RepoSLU107042017-09-15T11:02:03Z Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor Lilja-Helmersson, Frank klövskador cellhalt akuta klövskador individnivå The purpose of the present study was to investigate the cow-level association between acute hoof lesions and the somatic milk cell count in dairy cattle. Cows from three loose-housed Swedish dairy herds were enrolled in the study if they had an acute hoof lesion treated by a veterinarian or professional hoof trimmer during the preceding year, according to farmer records. Studied lesions were sole ulcer, dermatitis, interdigital necrobacillosis and hoof abscess, in each case causing lameness. For each hoof-diseased cow, 0 to 3 healthy cows were included, matched with respect to herd, breed, parity and lactation stage. Cell counts were obtained from monthly test recordings from one month before to three months after the hoof-lesion diagnosis, and log-transformed. In total, 203 cell-count observations from 14 hoof-diseased and 32 healthy cows were analysed using mixed least-squares multivariable regression modelling. A random effect for cow identity was included. The principal explanatory variable was disease month, coded as -1 the month before diagnosis, as 0 for the same month as diagnosis, as 1 or 2 for the corresponding number of months after diagnosis, and as 3 for 3 months after diagnosis and all observations in healthy cows. Predictors representing herd identity, breed, parity, lactation stage, milk yield, type of hoof lesion and season were tested but excluded in the final analysis because they were judged not to improve the model. Cows with an acute hoof lesion had a 2.1 times higher cell count the month before the diagnosis (P=0.002) and a 2.3 times higher cell count the same month as the diagnosis (P=0.005) compared to 3 months after the diagnosis and healthy cows. Syftet med studien var att på individnivå undersöka samband mellan akuta klövskador och mjölkcellhalt hos mjölkkor. Kor från tre svenska lösdriftsbesättningar togs med i studien om de hade en akuta klövskada som enligt lantbrukaren under det senaste året behandlats av veterinär eller professionell klövvårdare. Studerade klövskador var klövsulesår, eksem, klövspaltinflammation och klövböld, i samtliga fall orsakande hälta. För varje klövsjuk ko utvaldes 0-3 friska kor, matchade med avseende på besättning, ras, laktationsnummer och laktationsstadium. Cellhalter erhölls från månatliga provmjölkningsdata, från en månad före till tre månader efter diagnosen av klövskadan, och logaritmerades. Totalt 203 cellhaltsobservationer från 14 klövsjuka och 32 friska kor analyserades med ordinär multipel regression. Koidentitet inkluderades i modellen som en s k ”random effect”. Huvudförklaringsvariabeln var sjukdomsmånad, kodad som -1 för månaden före diagnos, som 0 för samma månad, som 1 eller 2 för motsvarande antal månader efter diagnos, och som 3 för 3 månader efter diagnos och samtliga observationer hos friska kor. Oberoende variabler för besättning, ras, laktationsnummer, laktationsstadium, mjölkavkastning, typ av klövskada och säsong testades men uteslöts i den slutliga analysen eftersom de inte bedömdes förbättra modellen. Resultaten visade att kor med en akut klövskada hade 2,1 gånger högre cellhalt en månad före (P=0,002) och 2,3 gånger högre cellhalt samma månad som diagnosen (P=0,005) jämfört med 3 månader efter diagnos och friska kor. SLU/Dept. of Animal Environment and Health (until 231231) 2005 L3 swe eng https://stud.epsilon.slu.se/10704/ |
| spellingShingle | klövskador cellhalt akuta klövskador individnivå Lilja-Helmersson, Frank Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| title | Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| title_full | Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| title_fullStr | Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| title_full_unstemmed | Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| title_short | Samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| title_sort | samband på individnivå mellan akuta klövskador och cellhalten i mjölk hos mjölkkor |
| topic | klövskador cellhalt akuta klövskador individnivå |