( ( ( ( ( ( If ( ( energy sources ) ( are ( ( ( limited ( in ( the rumen ) ) ) or ) ( if ( too much ) ) ) ) ) ) ( urea ( is consumed ) ) ) , ) then ) ( ( ( large amounts ) ( of urea ) ) ( can ( enter ( the ( circulatory system ) ) ) ) ) ) . )
(ROOT (S (S (SBAR (IN If) (S (NP (NN energy) (NNS sources)) (VP (VBP are) (UCP (VP (VBN limited) (PP (IN in) (NP (DT the) (NN rumen)))) (CC or) (ADJP (IN if) (RB too) (RB much)))))) (NP (NN urea)) (VP (VBZ is) (VP (VBN consumed)))) (, ,) (RB then) (S (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (NN urea)))) (VP (MD can) (VP (VB enter) (NP (DT the) (JJ circulatory) (NN system))))) (. .)))
If energy sources are limited in the rumen or if too much urea is consumed, then large amounts of urea can enter the circulatory system.
(ROOT (S (NP (NNS Animals)) (VP (MD can) (VP (VP (VB transport) (NP (NP (DT the) (NN waste) (NN material)) (VP (VBN known) (PP (IN as) (NP (NP (NN urea)) (PP (IN in) (NP (DT the) (JJ circulatory) (NN system)))))))) (CC and) (VP (VB store) (NP (PRP it)) (ADVP (RB safely)) (PP (IN at) (NP (JJ high) (NNS concentrations)))))) (. .)))