Milk fatty acid profile from grazing buffaloes fed a blend of soybean and linseed oils

• Autores: Gagliostro, G. A.; Patiño, E. M.; Sánchez Negrette, M.; Sager, G.; Castelli, L.; Antonacci, L. E.; Raco, F.; Gallello, L.; Rodríguez, M. A.; Cañameras, C.; Zampatti, M. L.; Bernal, C.
• Año de publicación: 2015
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 67 (3)
• Materia: Ganado bovino; Industria láctea; Leche; Ácido linoleico; Ácido láctico; Ácidos grasos; Aceites de soja
• Institución: Instituto Nacional de Tecnología Industrial

The aim of the study was to examine the changes in milk fatty acid (FA) profile of grazing buffaloes fed either low (L, 276g/d) or high (H, 572g/d) doses of a blend (70:30, wt/wt) of soybean and linseed oils. Fourteen multiparous Mediterranean buffaloes grazing on a native pasture were fed 4 kg/day of a commercial concentrate containing no supplemental oil over a pre-experimental period of ten days. The baseline milk production and composition and m i l k FA profile were measured over the last three days. After this pre-experimental period the animals received the same concentrate added with either the L or H oil doses for 26 additional days. Milk yield (g/animal/day) did not differ at the start (1776 ± 522 and 1662 ± 291 for L and H, respectively, P<0.622) or at the end of the t r i a l (4590 ± 991 and 4847 ± 447 in L and H, respectively, P<0.543). Baseline milk fat content (g/kg) averaged 77.1 (±20.5) in L and 74.3 (±9.9) in H (P<0.10) and was reduced (P<0.031) to 60.7 (±23.6) and 49.4 (±11.2) (P<0.0031) respectively after L and H with no differences between treatments (P<0.277). Baseline milk protein content (L=43.2 ± 3.4 and H= 44.3 ± 6.9g/kg) increased after oil supplementation (P<0.0001) in both L (73.2 ± 6.0g/kg) and H (68.4 ± 4.9g/kg) without differences between oil doses (P<0.123). Milk fat content of 14:0 decreased after oil supplementation only in the H treatment (5.29 to 4.03, P<0.007) whereas that of 16:0 was reduced (P<0.001) at both L (24.49 to 19.75g/100g FA) and H (25.92 to 19.17g/100g FA) doses. The reduction of total content o f 12:0 to 16:0 was higher (P<0.052) in H (32.02 to 23.93g/100g FA) than L (30.17 to 25.45g/100g FA). Vaccenic acid content increased (P<0.001) from 5.70 to 13.24g/100g FA in L and from 5.25 to 16.77 in H, with higher results in the in H treatment (P<0.001). Baseline rumenic acid was sharply increased (P<0.001) in L (1.80 to 4.09g/100g FA, +127%) and H (1.60 to 4.61g/100g FA, +187%) with no differences between L and H (P<0.19). Overall, these results indicate a pronounced improvement in the nutritional value of milk fat from grazing buffaloes fed little amounts (0.276g/day) of a blend of soybean and linseed oils.
Fil: Gagliostro, G. A. Instituto Nacional de Tecnología Agropecuaria (INTA); Argentina
Fil: Patiño, E. M. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias (UNNE); Argentina
Fil: Sánchez Negrette, M. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias (UNNE); Argentina
Fil: Sager, G. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias (UNNE); Argentina
Fil: Castelli, L. Instituto Nacional de Tecnología Industrial. INTI-Lácteos; Argentina
Fil: Antonacci, L. E. Instituto Nacional de Tecnología Agropecuaria (INTA); Argentina
Fil: Raco, F. Instituto Nacional de Tecnología Industrial. INTI-Lácteos; Argentina
Fil: Gallello, L. Instituto Nacional de Tecnología Industrial. INTI-Lácteos; Argentina
Fil: Rodríguez, M. A. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias (UNNE); Argentina
Fil: Cañameras, C. Instituto Nacional de Tecnología Industrial. INTI-Lácteos; Argentina
Fil: Zampatti, M. L. Instituto Nacional de Tecnología Industrial. INTI-Lácteos; Argentina
Fil: Bernal, C. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas (UNL); Argentina