T HE D AIRY S UPPLY C HAIN IN S OUTHERN B RAZIL : S TRUCTURE – E FFICIENCY – C OMPETITIVENESS Dissertation to obtain the Doctor of Philosophy (Ph. D.) degree in the Ph. D. Program for Agricultural Sciences in Göttingen (PAG) at the Faculty of Agricultural Sciences, Georg-August-University Göttingen, Germany presented by Caetano Luiz Beber born in Blumenau, Brazil Göttingen, December 2018