Cow in Silvopasture (IMAGE) American Society of Agronomy Caption Livestock are grazing on silvopasture system of Gliricidia sepium and Brachiaria decumbens; Pernambuco, Brazil. Tree legumes provide shade for livestock and add nitrogen to grazing system. Credit Jose Dubeux Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.