Nitrogen flow in pig production and enviromental consequences :  proceedings of the first international symposium on nitrogen flow in pig production and enviromental consequences, Wageningen(Doorwerth), The Netherlands, 8-11 June 1993/ 
M.W.A. Verstegen [et al...]. 
 - Wageningen :  Pudoc Scientific Publishers,  1993. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9022010856 
<br/><br/><label>LC Class. No.: </label>SF398.9  / Nit 1993