Cattle
Thirty-two Zebu cattle and 31 Holstein-Friesian (HF) cattle were sourced
from farms free of TB. Due to their nature, Zebu cattle were sourced
from the southern subtropical regions of Mexico (State of Veracruz) and
Holstein-Friesian cattle were sourced from the central region of Mexico
(State of Mexico). Zebu cattle varied between 2 and 8 months of age with
a median age of 3 months, whilst HF cattle varied between 4 and 7 months
of age with a median age of 6 months.