Effect of extrusion on the ileal and fecal digestibilities of lysine in yellow corn in diets for young pigs.

Abstract

Forty crossbred barrows (initial avg BW of 20 kg) were fitted with T-cannulas to determine the effects of extrusion of yellow corn on lysine digestibility. A basal corn-cornstarch-soybean meal diet was formulated to contain .55% lysine. Extruded corn (EC), non-extruded corn (C) and L-Lysine-HCl (LLH) replaced cornstarch in the basal diet to provide total dietary lysine levels of .60, .65 and .70% lysine for each lysine source. Diet intake was 5.5% of BW. Treatments were arranged as a 3 x 3 factorial with the basal diet as an extra dietary treatment. Apparent ileal digestibilities of lysine, threonine, methionine and isoleucine were greater (P less than .05) for diets with added LLH than for diets containing EC or C, which were similar (P greater than .05). Apparent ileal and fecal digestibilities and retention of nitrogen (N) as a percentage of N absorbed or consumed were greater (P less than .05) for diets containing LLH than for those containing EC or C, which were not different (P greater than .05). Plasma urea N levels were also lower (P less than .05) for pigs fed diets containing LLH than for pigs fed EC or C. Fecal DE and ME as a percentage of GE were greater (P less than .05) in diets containing EC than in those containing C. In summary, extrusion improved (P less than .05) energy utilization but did not affect the utilization of lysine or N in corn by pigs. However, lysine and N utilization were greater (P less than .05) in diets supplemented with LLH compared with EC or C.

Effects of particle size and extrusion of maize and sorghum on ileal digestibility and growth performance in pigs weaned at 14 and 21 days of age

“…In the present study, extrusion of maize and sorghum did not improve the ileal digestibilities of amino acids, with the exception that the digestibility of Met in sorghum was improved (P<0.05) in EW pigs as compared with ground maize or sorghum. This result is in partial agreement with previous studies for maize (Herkelman et al, 1990) and sorghum (Noland et al, 1976). Herkelman et al (1990) reported that extrusion improved energy utilisation but did not affect utilisation of lysine or N in maize by growing pigs.…”

“…This result is in partial agreement with previous studies for maize (Herkelman et al, 1990) and sorghum (Noland et al, 1976). Herkelman et al (1990) reported that extrusion improved energy utilisation but did not affect utilisation of lysine or N in maize by growing pigs. Noland (1976) also reported that extrusion improved energy digestibility of high tannin sorghum grain when fed to nursery pigs.…”

“…However, Herkelman et al (1990) reported that extrusion of maize improved energy utilisation but not utilisation of lysine or N by pigs. The report of Richert et al (1992) showed that extruded maize and sorghum improved performance for d 0 to 10 postweaning, but was of no benefit from d 10 to 38.…”

Composição química, avaliação físico-química e nutricional e efeito da expansão do milho e do farelo de soja para suínos em crescimento

“…A atividade ureática do farelo de soja expandido foi inferior ao nível mínimo mencionado, indicando, portanto, efeitos do superprocessamento. Os baixos valores de atividade ureática do farelo de soja expandido coincidem com os resultados de proteína solúvel e da solubilidade da proteína em KOH neste alimento, semelhante ao encontrado por Araba e Dale (1989;1990). Segundo Van Soest (1994), parte do nitrogênio estaria em forma não utilizável no trato gastrintestinal dos animais, atribuído à redução da taxa de hidrólise protéica, impedindo o acesso das proteases.…”

Energy content and amino acid digestibility of extruded and dehulled-extruded corn by pigs and its effect on the performance of weaned pigs

“…Therefore, the utilization of energy may be greater in pigs fed extruded corn versus raw corn. However, the ileal digestibility of lysine or nitrogen in extruded corn is not different from that in raw corn (Herkelman et al, 1990;Chae et al, 2000). Dietary fibre reduces energy and nutrient digestibility by pigs and as a consequence, increases fecal mass and nutri-ent excretion (Shi and Noblet, 1994;Canh et al, 1998;Davidson and McDonald, 1998).…”