Finally, LOQs obtained for each compound in the matrices evaluated are shown in Table S3, Electronic Supplementary Material. It can be observed that 69 % of compounds showed LOQs ≤50 μg kg−1 in hen feed, whereas in rabbit and horse feed, the number of compounds with LOQs ≤50 μg kg−1 was 55 % and 61 %, respectively. Table 1 shows a summary of the results obtained for all the matrices. As aforementioned, some compounds showed LOQs higher than the lowest concentration at which they can be recovered. Again, these compounds showed problems to detect the fragment at LOQ concentration, although their quasi-molecular ion was perfectly detected.