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The objective of the present work was to evaluate the physical-chemical characteristics (density, pH, acidity, fat, protein, lactose and total of solids contents) and milk fatty acids composition (C: 4 to C: 20) in response to roughage sources (alfalfa hay T1; oat hay T2 and maize silage T3). Nine Saanen lactating goats were used, in a triple Youden square design (3 animals x 2 periods). There was no treatment effects in the physical-chemical variables in the univariate analyses; by multivariate analyses three distinct patterns of fatty acids could be defined: milk with greater quantity of short chain fatty acids and acids C17:1omega7 e C18:2omega6 (T1); milk with equivalent amounts of short, medium and long chain fatty acids (T2); and milk with greater amounts of acids C16:1omega7, C17:0, C18:1omega9 and C20:0 (T3). These results indicated that the roughage sources used in the diet of lactating dairy goats affected the fatty acids composition, without altering the milk physical-chemical characteristics. The acids more sensitive to the treatment effects were: C10:0, C12:0, C14:0, C16:0, C16:1omega7, C18:0 and C18:3omega6. O presente trabalho teve por objetivo avaliar o efeito de fontes de volumosos (feno de alfafa T1; feno de aveia T2 e silagem de milho T3) nas características físico-químicas (densidade, pH, acidez, teores de gordura, proteína, lactose e sólidos totais) e composição em ácidos graxos (C:4 a C:20) do leite. Foram utilizadas 9 cabras Saanen em lactação, em delineamento experimental triplo quadrado de Youden (3 animais x 2 períodos). Não houve efeito (P>0,05) dos tratamentos nas variáveis físico-químicas. Através de análise multivariada, verificou-se três padrões distintos de ácidos graxos: leite com maior quantidade de ácidos graxos de cadeia curta e dos ácidos C17:1ômega7 e C18:2ômega6 (T1); leite com quantidades equivalentes de ácidos graxos de cadeia curta, média e longa (T2) e leite com maiores quantidades dos ácidos C16:1ômega7, C17:0, C18:1ômega9 e C20:0 (T3). Estes resultados indicaram que a fonte de volumoso em dietas de cabras em lactação afeta a composição em ácidos graxos, sem alterar as características físico-químicas do leite. Os ácidos mais sensíveis aos efeitos dos tratamentos foram: C10:0, C12:0, C14:0, C16;0, C16:1ômega7, C18:0 e C18:3ômega6

Physical-chemical characteristics and fatty acids composition in dairy goat milk in response to roughage diet