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Productive performance, milk composition, and milk fatty acids of goats supplemented with sunflower and linseed whole seeds.

E. Vargas-Bello-Pérez

Abstract:

94
Productive performance, milk composition, and milk fatty acids of goats supplemented with sunflower and linseed whole seeds.
E. Vargas-Bello-Pérez*1, C. A. García Montes de Oca2, N. Pescador-Salas2, J. G. Estrada Flores3, J. Romero Bernal2, L. E. Robles Jimenez2, M. González-Ronquillo3. 1Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen Frederiksberg C, Denmark, 2Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México Toluca, Estado de México, México, 3Instituto en Ciencias Agropecuarias y Rurales, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México Toluca, Estado de México, México.

The objective of this study was to determine productive performance, milk composition and milk fatty acids (FA) of goats supplemented with sunflower and linseed whole seeds in grass silage-based diets. Nine Alpine goats were grouped in a replicated 3 × 3 Latin square design (n = 3) that included 3 21 d periods. Treatments were based on grass silage offered ad libitum and a concentrate mixture supplemented with either 40 g/d of Megalac (control), 80 g/d of sunflower seed (SF), or 80 g/d of linseed (LS). Data was analyzed using GLM procedure of SAS. Milk yield (776 ± 20 g/d), dry matter intake (64 ± 3 g/kg LW0.75) and digestibilities (g/kg) of dry matter (612 ± 27), organic matter (664 ± 12), neutral detergent fiber (567 ± 24) and acid detergent fiber (522 ± 28) were not affected by treatments (P > 0.05). Treatment did not affect milk fat yield (40 ± 1.1 g/d), protein content (4.5 ± 0.04%) and protein yield (35 ± 1.2 g/d). Milk fat content was higher (P < 0.05) in control (5.4 ± 0.1%), intermediate in SF (5.1 ± 0.1%) and lower (4.9 ± 0.1%) in LS. Compared with control, SF and LS, decreased C16:0 (28.2 ± 0.8 vs. 23.1 ± 0.8 and 22.4 ± 0.8 g/100g) and increased total C18:1 (24.1 ± 1.1 vs. 27.6 ± 1.1 and 28.4 ± 1.1 g/100g) respectively. The ratio of monounsaturated to polyunsaturated FA was higher (P < 0.05) in LS (8.9 ± 0.32), intermediate in SF (7.7 ± 0.32) and lower in control (6.2 ± 0.32). Overall, SF and LS represent an effective strategy for altering the FA composition of goat's milk toward a healthier profile for humans without deleterious effects on animal performance.

Keywords: oilseeds, milk, dairy goat.