Table 1.

List of covariates tested for their relationship with the infectious disease mortality

Farm factors	Farmer’s age, gender, education level, main occupation, herd size, land size
Management factors	Tick control, worm control, trypanosome control, vaccine use, grazing practices, watering practices, housing
Maternal status	Heart girth measurement, body condition score, suckling, health condition, dam antibody titres against Theileria parva, Theileria mutans, Anaplasma marginale, Babesia bigemina
Environmental variables	Normalised difference vegetation index (NDVI), farm altitude (elevation)
Calf factors	Calf sex, birth weight, heterozygosity, European introgression, clinical episodes, total serum protein, packed cell volume, white blood cell counts
Infectious factors	Protozoan: Theileria parva, Theileria mutans, Anaplasma marginale, Babesia bigemina, Trypanosoma spp., Coccidia spp. Helminths: Calicophoron spp., Cooperia spp., Dictyocaulus viviparous, Fasciola spp., Haemonchus placei., Moniezia spp., Microfilaria spp., Nematodirus spp., Oesophagostomum radiatum, Toxocara vitulorum, Trichostrongylus axei, Trichuris spp., Strongyloides eggs, Strongyle eggs. Fungi: Trichophyton spp.