Resumen

MONTOYA AGUIRRE, Jhon Alejandro; CORREA CARDONA, Héctor Jairo  y  GALVIS GOEZ, Rubén Darío. Effect of choline and methionine protected on intake, Lipid Mobilization, Production and composition of milk in Holstein Cows. Ces. Med. Vet. Zootec. [online]. 2015, vol.10, n.2, pp.179-192. ISSN 1900-9607.

To evaluate the effect of choline and methionine protected in rumen on plasma concentrations of triglyceride (TG), non-esterified fatty acids (NEFAS), β-hydroxybutyrate (BHB); the dry matter intake; production and milk composition, 24 Holstein cows were selected. They were randomly assigned to four treatments: T0: 0.0 g/day of Choline + 0.0 g/day of Methionine, T1: 0.0 g/day of Choline + 15 g/day of Methionine, T2: 15 g/day of Choline + 15 g/day of methionine and T3: 30 g/day Choline + 15 g/day Methionine. The day 270 of pregnancy, calving and days 10 and 20 postpartum, were determined plasma concentrations of TG, NEFAS and BHB; day 270 of gestation, 10 and 20 postpartum was estimated the dry matter intake of forage (DMIf) and total dry matter intake (DMIt). The milk production was recorded on days 5, 10, 15 and 20 pospartum and its fat and protein content was determined. The data were analyzed using the PROC MIXED model of SAS for a completely randomized design with repeated measures. Concentrations TG, NEFAS and BHB were significantly higher on day 10 prepartum, calving and 20 days postpartum, respectively (p<0.0001). The BHB was significantly higher in the treatments containing choline and methionine (T2 and T3) (p=0.0157). The DMIt, milk production and protein percentage were affected by the sampling periods (p<0.0001).

Palabras clave : -hydroxybutyrate lipid metabolism; lipotropic factors; NEFAS; triglycerides.

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