A merocrine secretion that is produced by a Harderian gland, containing lipids.
Comment:
[taxon-note] "in amphibians, chiefly seromucoid with some lipids[PMID:7559104]"; [taxon-note] "in birds, mucoid and lipid[PMID:7559104]"; [taxon-note] "in mammals, predominantly lipid; mucoid secretion restricted to extraglandular duct tissue[PMID:7559104]"; [taxon-note] "in the armadillo and opossum, mucous or serous acini may be present[PMID:7559104]"