Be more sustainable with low crude protein animal feed
Following recent estimations, the livestock supply chain may be responsible for 53% of anthropogenic nitrous oxide and 5% of carbon dioxide emissions. Animal production has an impact on environmental issues like global warming. Therefore, a precision animal nutrition is necessary to meet the nutrient requirements exactly.
BY TECHNICAL MARKETING TEAM, CJ EUROPE GMBH C
urrently, 8 out of 10 essential amino acids are com- mercially available, making it possible to further de- velop the advantages of a low crude protein (CP) strategy. Reducing the CP level while fulfilling the
amino acid requirement by supplementing crystalline amino acids, decreases faecal and urinary nitrogen excretion and consequently reduces the environmental nitrogen load. Pro- tein sources such as soybean meal typically contain twice as much phytic acid compared with grains (wheat and corn). Thus, a low CP strategy not only reduces nitrogen excretion but will reduce phosphorus excretion too. Lowering the CP
content of pig´s and poultry diets is therefore an important approach to improving the sustainability of the whole sector.
Lower nitrogen emissions in pigs Nitrogen excretion is still one of the major critics of modern pig production. Using the ideal protein pattern, it is possible to reduce the dietary CP content while maintaining the pig´s growth performance and carcass traits. Wang et al. (2018) re- cently summarised that each 1% decrease in dietary CP con- tent, will reduce the nitrogen excretion by almost 2.8%. An additional environmental benefit has been shown through a reduction of dietary CP from 14.5% to 12.0%. The low CP group caused a significant impact on manure concentration of volatile fatty acids, phenols and N20. Thus, the potential to decrease the environmental load by changing dietary strate- gies is huge. Combining different nutritional strategies (e. g. lowering CP intake, inclusion of fermentable fibre and adding acidifying salts) may lead to 70% reduction in ammonium emission in growing-finishing pigs. Another study tested the effects of a reduction in dietary CP content on N-retention and growth performance. A reduction in CP from 19.7% to 16.8% led to no changes on N-retention
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▶ SUSTAINABILITY AND WELFARE | OCTOBER 2020
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