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comparison of efficiency and reproductive aptitude indexes between a reference and field strains of the cattle tick rhipicephalus (boophilus) microplus, in sinaloa, mexico.the objective of this work was to study the reproductive behavior of two strains of r. (b.) microplus, one wild-caught (native) and one reference strain (media joya) for two years, measuring the reproductive efficiency index (rei) and reproductive aptitude index (rai). engorged ticks from each strain were collected monthly from february 2002 to february 2004. these were weighed and kept in the laboratory until egg-laying. oogenic masses were individually weighed and incubated until larvae emerge ...200920040202
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