Abstract

ARENAS, Fredy A; NOGUERA, Ricardo R  and  RESTREPO, Luis F. Effect of different types of fat on the degradation and fermentation kinetics of the dry matter in vitro in ruminants diet. Rev Colom Cienc Pecua [online]. 2010, vol.23, n.1, pp.55-64. ISSN 0120-0690.

The objective of the experiment was to evaluate the effect of saturated and unsaturated fats and the protection degree (protected and without protection) on the in vitro degradation kinetics of the dry matter (DM) in diets for ruminants. Four diets were formulated to be isocaloric (3200 Kcal DE/ Kg DM) and isoproteic (13%CP), in total mixed ration (TMR), according to the nutritional requirements of sheep in finished. Four types of fats were formulated with 8% fat (DM basis) and evaluated: 1) saturated fat without protection (GSSP), 2) saturated fat protection (GSP), 3) unsaturated fat without protection (GISP) and 4) protected unsaturated fat (GIP).To estimate the kinetics and the extent of DM degradation and kinetics of gas production, the diets were evaluated using the in vitro gas production technique based on the models proposed by Orscov and McDonald (1979) and France et al. (1993) using the SAS procedure PROC NLIN (2001), repeated measures analysis were used to determine the effect of treatment on gas production and degradation of DM in time using the SAS procedure PROC MIXED (2001)In this experiment the use of protected unsaturated fat didn’t affect DM degradation according to those unprotected. There was no clear effect of saturated fats on the degradation and fermentation kinetics.

Keywords : degradability; gas production; in vitro; ruminant.

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