Tailored phase-feeding program for liquid-fed growing pig towards a reduced use of protein rich diet

F. Maupertuis (Chambre d’Agriculture des Pays de la Loire, Ferme expérimentale) et al., 70th Annual Meeting of the European Federation Animal Science (EAAP), 26-30 août 2019, Ghent, Belgique, p. 481, poster

The growth profile and amino acid requirements of crossbred pigs were assessed with the InraPorc® software and used to investigate the possibility of implementing different phase-feeding strategies using a liquid feeding system.
Two batches (16 pens × 14 pigs per pen) were studied over the 44 to 120 kg body weight (BW) range. Two diets with 1.0 g (A) or 0.5 g (B) of digestible lysine per MJ of net energy (LYS/NE) were blended in proportions that depended on the strategy and the BW range. If using the 2-phase (2P) strategy, LYS/NE was 0.9 up to 65 kg BW and 0.8 afterwards. If using the 5-phase strategy (5P), LYS/NE was 0.90 (BW<50 kg), 0.85 (50-65 kg), 0.80 (65-85 kg), 0.70 (85-105 kg), and 0.60 (BW>105 kg). The daily supply of feed increased weekly by around 0.2 kg/pig, up to a plateau (gilts: 2.8 kg/d, barrows: 2.6 kg/d). The change from one phase to another was undertaken by the average BW per pen (measured every 3 weeks) and the minimum amount of feed the liquid-feeding system could deliver. Due to delivery problems, data of two pens were removed from the trial. No significant difference were observed between 2P and 5P pigs on daily feed intake (respectively: 2.38 and 2.42 kg/d, P=0.47), average daily gain (822 and 814 g/d, P=0.64), and feed conversion ratio (2.93 and 3.00, P=0.26). Diet A represented on average 65.4 and 48.1% of the total feed intake for 2P and 5P pigs (P<0.01), respectively. Based on the difference between N intake calculated from the crude protein (CP) content of diets A (15.6%) and B (10.7%) and N retention assessed from carcass leanness (P=0.37), N output was reduced by 6% with the 5P strategy (P=0.04). The decrease would have reached 19% with a two-phase strategy based on typical growing-finishing diets (16 and 15% CP) instead of the low-protein blends (14.6 and 13.6% CP) used in this study. Based on global environmental impacts of feedstuffs incorporated into diets A and B, the 5P strategy may contribute to a reduced consumption of phosphorus and climatic change. This research was part of the DY+ project, co-funded under the European Union’s Feader program.