Consequences of dietary fibre for distribution of nitrogen excreted in pig
2016
Patráš, Peter (National Agricultural and Food Center, Lužianky (Slovak Republic). Research Institute of Animal Production Nitra, Department of Nutrition) | Nitrayová, Soňa (National Agricultural and Food Center, Lužianky (Slovak Republic). Research Institute of Animal Production Nitra, Department of Nutrition) | Brestenský, Matej (National Agricultural and Food Center, Lužianky (Slovak Republic). Research Institute of Animal Production Nitra, Department of Nutrition) | Heger, Jaroslav (National Agricultural and Food Center, Lužianky (Slovak Republic). Research Institute of Animal Production Nitra, Department of Nutrition)
A minimum level of fibre has to be included in pig diets to support normal physiological activity in the digestive tract. The objective of this study was to investigate the effects of dietary fibre level on redistribution of nitrogen (N) between faeces and urinary at different levels of nitrogen content in the diet. Two dietary fibre (CF) levels, low and high fibre (+27%) and two dietary protein concentrations - low and high protein (+26%) were tested in 4 x 4 Latin square design. Eight pigs (29.9± 1.7 kg) were housed in metabolic cages for 10 days. Faeces and urine were separately collected from 7 to 10 day. Nitrogen excretion was affected with the inclusion of 150 g/kg beet pulp (+12.1 g/d CF) in all groups diets shift from urinary to faecal excretion was detected. Highest significant difference was (faecal N) in the group with the high protein diet +34 % (P <0.05). The approximately same N content in the diet and the different fibre content caused different distribution of N in the urine too. Increasing the fibre content in the diet (26%) decreased the amount of nitrogen in the urine by 13 and 17%. Urinary/faecal N ratio was recorded of 3.14 vs. 2.05 (P <0.05). Nitrogen retention expressed as percentage of N intake was reduced in pigs fed the low-protein diets and it was affected by fibre addition to diet by -3.5 %. However, high protein diet positively increased N retention to 11.0 % (P <0.05), when the dietary fibre was increased. The content of fibre and crude protein in the diet had an effective influence on the distribution and excretion of N, which may contribute to the reduction of emissions from excrements.
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