期刊
SUSTAINABILITY
卷 13, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/su13094815
关键词
acidification; nitrogen; swine
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (Brasilia, Brazil)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
Reducing the crude protein content and supplementing with amino acids in diets for growing pigs improved weight gain and nutrient utilization, while also reducing environmental impacts such as acidification, eutrophication, and land occupation through life cycle assessment.
Two experiments were performed to determine the digestibility of diets with crude protein (CP) reduction supplemented with amino acids (18.15; 17.15; 16.15 and 15.15%) to growing pigs (30-50 kg), to assess the use of nutrients and account for the manure excretion, and to evaluate the performance, backfat thickness, Longissimus lumborum depth, and plasma urea, aiming to evaluate the environmental impact through life cycle assessment (LCA); for the first time in Brazil interacting experiments were developed to evaluate the CP reduction and LCA. The CP reduction resulted in greater daily weight gain (p = 0.011), final weight (p = 0.020), better use of N and P, through the greater N and P retained (p = 0.003 and p = 0.017, respectively). There was a linear reduction in acidification potential (p = 0.015), eutrophication potential (p = 0.001), and land occupation (p = 0.005) when dietary CP decreased from 18.15 to 15.15%. The reduction in CP and supplementation of amino acids in diets for growing pigs (30-50 kg) improved final and daily weight gain. Through LCA, and performance and metabolism data, it was concluded that for the acidification, eutrophication and land occupation categories, impacts were reduced as the protein concentration was reduced.
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