Abstract
Laying White Leghorn chickens were fed mirex at 0, 5, 10, 20, 40, 80, and 160 ppm for 12 weeks, and laying Japanese quail were fed mirex at 0, 5, 40, and 80 ppm for 12weeks. The data suggest that dietary mirex at these levels did not affect egg production, egg weight, shell thickness, shell calcium, the proportion of broken eggs, or the proportion of soft-shelled eggs of either chickens or quail. Statistical significance (P greater than 0.05) associated with dietary mirex was detected in the analysis of eggshell weight for chickens; however, because a dose-response relationship of shell weight vs. level of mirex fed was not evident, this observation was attributed to chance. The data suggest that dietary mirex did not affect eggshell weight, fertility, or hatchability of quail. Mirex accumulation in eggs and carcasses of both species was proportional to dose and was slightly higher in quail than in chickens.
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