Frei, C <br/><br/>
The production system and disease incidence in a national random longitudinal study of Swiss dairy herds.  [electronic resource] 

 -  Preventive veterinary medicine  Sep 1997 
 - 1-21 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>0167-5877 
<br/><br/><label>Standard No.: </label>10.1016/s0167-5877(97)00020-2  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal Husbandry<br/>Animals<br/>Cattle<br/>Cattle Diseases--epidemiology<br/>Epidemiologic Methods--veterinary<br/>Female<br/>Incidence<br/>Longitudinal Studies<br/>Pregnancy<br/>Switzerland--epidemiology