Rank the following practices for risk of introduction of Joh…
Rank the following practices for risk of introduction of Johnes disease into a negative herd, from MOST RISKY to LEAST RISKY: a) Introduction of a mature cow from an unknown source, b) Custom rearing weaned calves (6 months old) until they are 12 months old, c) Walking around with manure covered boots from another farm, d) Custom rearing bottle calves (0-4 months old).
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