Se bioavailability in commercial pet foods has been shown to be highly variable. The aim of the present study was to identify dietary factors associated with in vitro accessibility of Se (Se Aiv) in pet foods. Se Aiv is defined as the percentage of Se from the diet that is potentially available for absorption after in vitro digestion. Sixty-two diets (dog, n 52; cat, n 10) were in vitro enzymatically digested: fifty-four of them were commercially available (kibble, n 20; pellet, n 8; canned, n 17; raw meat, n 6; steamed meat, n 3) and eight were unprocessed (kibble, n 4; canned, n 4) from the same batch as the corresponding processed diets. The present investigation examined if Se Aiv was affected by diet type, dietary protein, methionine, cysteine, lysine and Se content, DM, organic matter and crude protein (CP) digestibility. Se Aiv differed significantly among diet types (P< 0·001). Canned and steamed meat diets had a lower Se Aiv than pelleted and raw meat diets. Se Aiv correlated positively with CP digestibility in extruded diets (kibbles, n 19; r 0·540, P =0·017) and negatively in canned diets (n 16; r − 0·611, P =0·012). Moreover, the canning process (n 4) decreased Se Aiv (P =0·001), whereas extrusion (n 4) revealed no effect on Se Aiv (P =0·297). These differences in Se Aiv between diet types warrant quantification of diet type effects on in vivo Se bioavailability.

This paper concerns crosslinguistic differences in the acceptability of so-called relative clause extraction constructions, exemplified by the unacceptable English sentence *This boat I know the guy that owns (associated with the acceptable canonical sentence I know the guy that owns this boat). It has sometimes been argued, since Ross (1967), that such extractions are universally blocked by a syntactic constraint. However, following observations of such structures in English and other languages, some linguists have argued that such sentences have varying degrees of acceptability and that the degree of acceptability depends on attention limits and pragmatic foregroundedness/backgroundedness. Another view which appears to have gained ground in recent years is one where the degree of acceptability is directly related to processing difficulty. The analysis presented in this paper is based on a comparison between English and Swedish, and includes authentic data, examples previously discussed in the literature, as well as acceptability-tested invented sentences. In the end it will be argued that, while the dominance- and processing-based proposals are on the right track, there is a more plausible and straightforward way of explaining the observed crosslinguistic variation using the theoretical framework of Construction Grammar. Thus, an alternative account will be presented drawing on general principles which are well established within cognitive- and construction-based theories.