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Effect of starch source in pelleted diets on growth performance of pigs
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Edité par CCSD -
International audience. In European pig diets, wheat (W) and barley (B) are major energy suppliers. Their contrasted proportions in rapid and slowly digestible starch may alter the positive effect of pelleting on digestibility and metabolic use of energy. This study aimed to compare performance of growing pigs fed with pelleted diets, formulated for being iso-net energy (NE), either based on W, B or a balanced mixture of both cereals (so-called WB). Two batches of 224 gilts and entire males were studied between 31 and 117 kg body weight (16 pens of 7 pigs/treatment). Pigs were fed ad libitum with a 2-phase strategy. Based on chemical and nutritional (assessed with Evapig® for diets produced without any heating process) characteristics of feedstuffs, all diets were formulated to 9.40 MJ NE, 47 g crude fibre and 30 g crude fat/kg. Digestible lysine content was 0.93 and 0.85 g/MJ NE and starch content was 438 and 441 g/kg in Phase-1 and Phase-2 diets, respectively. All diets were pelleted (pellets temperature = 78±2°C). The average daily feed intake of W pigs was lower than that of B and WB pigs (2.62 vs. 2.69 kg/d on average for B and WB, P=0.03), without any difference in growth rate (1029 g/d on average for all groups, P=0.55). The resulting feed conversion ratio tended to be lower in W pigs (2.53 vs. 2.59, P=0.07). The hot carcass yield was better in W pigs (79.8 vs. 79.4%, P=0.02), but no difference was observed on carcass leanness (61.5%, on average for all groups, P=0.28). These results would agree with a greater improvement of the digestibility and/or metabolic utilisation after pelleting of W diets (compared to B), but more investigations are required to understand why results with WB were not intermediate between W and B.
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