Effects of the diet form on health and performance of weaning or fattening pigs

visuel de Eric Royer et al., présenté aux 66e EAAP, Varsovie, Pologne, le 31 août-04 septembre 2015, session 14 : customized nutrition taking into account the health status of farms and individual animals, 11 pages

Four experiments were carried out to study the effect of dietary presentation on pigs. In a postweaning study, meal and pellets were compared in either good or bad sanitary conditions (Exp. 1, 14 pens/treatment). Over 41 days after weaning, pigs were offered ad libitum a phase 1 then a phase 2 diet in a dry feeder. The meal form increased DF1 (+6%, P<0.01) but reduced ADG (-4%, P<0.05), then increased FCR (+10%, P<0.01). Meal improved the faecal consistency at d 20 (+8%, P<0.05), but no differences were observed between treatments at d 5, 12 and 26. No interaction between presentation and sanitary conditions was found. In the fattening periods, diet was presented either as meal or ground pellets and delivered restrictively using a liquid feeding system to gilts and barrows (Exp. 2, 16 pens/treatment) or boars (Exp. 3, 8 pens/treatment). In Exp. 2 DFI averaged 2.13 kg for both presentations , but FCR (-5%, P<0.05), carcass yield (+1%, P<0.01) and carcass leanness (+0.4%, P=0.09) were (or tended to be) improved with pellets. In Exp. 3, the tendency for a lower DFI with pellets (-2%, P=0.06) without any difference in ADG resulted in a reduction in FCR (-3%, P=0.05). With pellets, fewer pigs presented a skatole level above the minimum detectable concentration in liquid fat (P=0.01). In Exp. 4 (32 pens/treatment), meal and pellets supplied in dry feeders and meal mixed with water in the trough were given to fatteners, either under restricted or ad libitum feeding conditions. The DFI was higher with liquid meal than with the other forms (P<0.01). During the growing phase, the highest ADG was found with pellets and the lowest with liquid meal, whereas during the finishing period ADG was higher with liquid meal and pellets than with dry meal. The FCR was 4 and 7% lower with pellets than with dry and wet meal, respectively (P<0.01). The improved FCR observed in Exp. 1 to 4 with pellets, compared with dry or wet meal, could be attributed to the increased digestibility of nutrients induced by technology used for diet preparation.