Calf-Level Factors Associated with Bovine Neonatal Pancytopenia – A Multi-Country Case-Control Study

Jones, Bryony A.; Sauter-Louis, Carola; Henning, Joerg; Stoll, Alexander; Nielen, Mirjam; Van Schaik, Gerdien; Smolenaars, Anja; Schouten, Matthijs; den Uijl, Ingrid; Fourichon, Christine; Guatteo, Raphael; Madouasse, Aurélien; Nusinovici, Simon; Deprez, Piet; De Vliegher, Sarne; Laureyns, Jozef; Booth, Richard; Cardwell, Jackie M.; Pfeiffer, Dirk U.

Dam PregSure vaccination (Table 4, Table S5 ). Case dams had increased odds of being PregSure-vaccinated compared with control dams. Case dams were more likely to have received their last dose of PregSure longer before calving, and to have received more doses of PregSure, compared with control dams. PregSure vaccination variables were correlated with each other so they were added to the model separately. The responses to dam PregSure-vaccinated were more reliable than no. doses PregSure because some farmers reported the initial two doses as a single dose, and for some dams the number of doses was unknown. First lactation cows were less likely to have received PregSure (49%) compared with second (14%) and third or more lactation cows (12%), and were more likely to have received fewer doses of PregSure than second or third or more lactation cows (Table S6 ). The polychoric correlation coefficient between PregSure doses and lactation number was 0.61.