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Newcastle West, Ireland

McDonnell P.,Lyons Research Farm | O'Shea C.J.,Lyons Research Farm | Callan J.J.,Lyons Research Farm | O'Doherty J.V.,Lyons Research Farm
Animal Feed Science and Technology | Year: 2011

A completely randomized design experiment was performed to examine the effect of formulating incremental concentrations of dietary maize dried distiller's grains with solubles (DDGS) on a net energy (NE) and ileal digestible amino acid (IDAA) basis, on growth performance and coefficient of total tract apparent digestibility (CTTAD) parameters of growing-finishing pigs. The study investigated the effect of incrementally replacing diet wheat with DDGS on pig growth performance, carcass characteristics, apparent nutrient digestibility, nitrogen (N) balance, phosphorus (P) balance and manure ammonia emissions. Three hundred and fifty-two pigs (42.4. kg, SD. = 6.4. kg) were blocked on the basis of initial body-weight (BW) and assigned to one of four dietary treatments: (T1) basal diet, (T2) basal diet with 100. g/kg DDGS, (T3) basal diet with 200. g/kg DDGS and (T4) basal diet with 300. g/kg of DDGS. The inclusion of DDGS in the diet was achieved by decreasing concentrations of wheat and all dietary treatments were formulated to contain similar concentrations of IDAA, available P and NE. There was no effect of increasing levels of DDGS on daily gain, feed intake, feed conversion ratio (FCR) and carcass characteristics during the experimental period (P>0.05). There was a linear decrease (P<0.01) in the CTTAD of dry matter and gross energy with increasing levels of DDGS in the diet. There was a linear increase in N intake (P<0.001), urinary N excretion (P<0.01) and total N excretion (P<0.01) with increasing levels of DDGS in the diet. There was a linear decrease (P<0.01) in P intake as the level of DDGS increased in the diet. There was no difference in manure ammonia emissions as the level of DDGS increased in the diet (P>0.05). In conclusion, when formulated on a NE and IDAA basis, consumption of DDGS at inclusion rates of up to 300. g/kg does not affect growth performance or carcass characteristics. While incremental consumption of dietary DDGS increased total N excretion, this was not reflected in elevated manure ammonia emissions. © 2011 Elsevier B.V. Source


O'Doherty J.V.,Lyons Research Farm | Dillon S.,Lyons Research Farm | Figat S.,Lyons Research Farm | Callan J.J.,Lyons Research Farm | Sweeney T.,Lyons Research Farm
Animal Feed Science and Technology | Year: 2010

A 2 × 2 factorial experiment was conducted to investigate the interactions between two different lactose (L) levels (150 g/kg vs. 250 g/kg) and seaweed extract (SWE): (0 g/kg vs. 2.8 g/kg; containing laminarin and fucoidan) derived from Laminaria spp. on growth performance, coefficient of total tract apparent digestibility (CTTAD) and faecal microbial populations in the weanling pig. Two hundred and forty pigs (120 male and 120 female) were selected after weaning (24 days of age, 7.6 ± 0.9 kg live weight) and blocked on the basis of live weight and within each block assigned to one of the four dietary treatments. The pigs were offered the following diets on an ad libitum basis for 25 days: (T1) 150 g L/kg; (T2) 150 g L/kg + SWE; (T3) 250 g L/kg; (T4) 250 g L/kg + SWE. Pigs offered diets supplemented with SWE had a higher average daily gain (ADG): (322 g vs. 281 g, s.e. ± 9.0; P<0.01) and gain to feed (G:F) ratio (669 g/kg vs. 611 g/kg, s.e. ± 19.0; P<0.05) between days (d) 0-25 compared with pigs offered non-SWE diets. Pigs offered high L diets had a higher ADG (319 g vs. 283 g, s.e. ± 9.0; P<0.05) and average daily feed intake (ADFI) between d 0-25 (480 g vs. 447 g, s.e. ± 11.0; P<0.05) compared with pigs offered the low L diets. The inclusion of SWE increased (P<0.001) the CTTAD of nitrogen (N) and gross energy (GE) and reduced the counts of Escherichia coli in the faeces compared with non-SWE diets. Pigs fed the high L diets had increased CTTAD of GE (P<0.001) and N (P<0.05) and decreased the counts of E. coli in the faeces compared with pigs offered low L diets. Summarising, the inclusion of either a high dietary concentration of L or a laminarin-fucoidan extract increased the CTTAD of diet components, decreased the counts of E. coli in the faeces and improved performance of pigs after weaning in the current study. © 2010 Elsevier B.V. All rights reserved. Source


Dillon S.,Lyons Research Farm | Sweeney T.,Lyons Research Farm | Figat S.,Lyons Research Farm | Callan J.J.,Lyons Research Farm | O'Doherty J.V.,Lyons Research Farm
Livestock Science | Year: 2010

A 2 × 2 factorial experiment was conducted to investigate the interactions between 2 different lactose levels (150g/kg vs 250g/kg) and the addition of seaweed extract (2.8 g/kg, containing laminarin and fucoidan) derived from Laminaria spp. on growth performance, nutrient digestibility and faecal microbial population in the weanling pig. Two hundred and forty piglets were selected after weaning (24days of age, 7.6kg (s.d 0.9kg) live weight) and blocked on the basis of live weight and within each block assigned to one of four dietary treatments. Piglets offered diets supplemented with seaweed extract had a higher average daily gain (ADG) (0.322 vs 0.281 kg, s.e ± 0.009) (P < 0.01) and gain to feed ratio (0.669 vs 0.611 kg/kg, s.e ± 0.019) (P < 0.05) during the entire experimental period (days 0-25) compared with piglets offered un-supplemented seaweed extract diets. Piglets offered high lactose diets had a higher ADG (0.319 vs 0.283. kg, s.e ± 0.009) (P < 0.05) and average daily feed intake between days 0 and 25 (0.480 vs 0.447. kg, s.e ± 0.011) (P < 0.05) compared with piglets offered the low lactose diets. The inclusion of seaweed extract increased (P < 0.001) the apparent digestibility of nitrogen (N Dig) and gross energy (GE Dig) and decreased (P < 0.05) faecal E. coli populations compared with un-supplemented seaweed extract diets. Piglets offered the high lactose diets had increased GE dig (P < 0.001), N dig (P < 0.05) and decreased (P < 0.05) faecal E. coli populations compared with piglets offered low lactose diets. In conclusion, the inclusion of either a high dietary concentration of lactose or a laminarin-fucoidan extract increased daily gain and gain to feed ratio of post weaned piglets through an increase in nutrient digestibility and decreased E. coli populations in the gut. © 2010 Elsevier B.V. Source

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