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- W2015317939 abstract "A performance study and a nitrogen balance study (2×3 factorial) were conducted to investigate the interaction between lactose level (215 and 125 g/kg) (lactofeed 70; 860 g whey permeate/kg, 140 g soya bean meal/kg, Volac International, UK) and crude protein (CP) concentration (160, 185 and 210 g/kg) on post-weaning piglet performance, nitrogen metabolism, faecal microbiology and faecal volatile fatty acid concentrations. In the performance trial, 252 piglets (7.6 kg; 33 days of age) were assigned to one of six dietary treatments following a 12-day period on a commercial creep diet (17 MJ/kg DE, 16 g lysine/kg). The experimental diets were fed for 28 days (days 12–40) and were formulated to have identical digestible energy (15 MJ/kg) and total lysine (14.5 g/kg) contents. In the N balance experiment, 24 boars (20 kg live weight) were offered the same diets as in the performance trial. Faecal samples were collected for selected microbial populations. There was an interaction (P<0.05) between lactose and CP concentration in daily gain (ADG) and daily feed intake (ADFI) (P<0.01) during the weaner period (days 12–40). At the high lactose level there was a linear increase in ADG and ADFI with increasing CP. However, at the low lactose level there was no increase in ADG or ADFI above the medium CP. Pigs offered 215 g lactose/kg had a higher dry matter (P<0.001), organic matter (P<0.001), energy (P<0.001), nitrogen (P<0.01) and neutral detergent fibre (P<0.05) coefficient of total tract apparent digestibility compared to pigs offered 125 g lactose/kg. There was an interaction between lactose and CP concentration for nitrogen intake (NI) (P<0.05), urine pH (P<0.05) and selected faecal microbial populations. At the high CP level, pigs offered diets containing 215 g lactose/kg had a higher NI and a lower urine pH than pigs offered 125 g lactose/kg (P<0.05). However, the inclusion of lactose had no significant effect on either NI or urine pH at the low or medium CP concentration. At the low lactose level there was a linear increase in faecal E. coli population and a linear decrease in faecal Lactobacilli population with increasing CP. However at high lactose levels CP concentration had no effect on either E. coli or Lactobacilli populations. Pigs offered 215 g lactose/kg had a significantly higher Bifidobacteria population compared to pigs offered 125 g lactose/kg. There was a linear decrease in Bifidobacteria population as CP increased. In conclusion, at the high lactose level there was a linear increase in ADG and ADFI with increasing CP concentrations. There was no increase in these parameters above 185 g CP/kg at the low lactose level." @default.
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- W2015317939 date "2007-01-01" @default.
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- W2015317939 title "The interaction between lactose level and crude protein concentration on piglet post-weaning performance, nitrogen metabolism, selected faecal microbial populations and faecal volatile fatty acid concentrations" @default.
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- W2015317939 doi "https://doi.org/10.1016/j.anifeedsci.2006.02.010" @default.
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