Abstract

CARDONA-IGLESIAS, Juan Leonardo; MAHECHA-LEDESMA, Liliana  and  ANGULO-ARIZALA, Joaquín. Effect on of in vitro fermentation of mixture of Tithonia diversifolia , Cenchrus clandestinum and polyunsaturated fats. Agron. Mesoam [online]. 2017, vol.28, n.2, pp.405-426. ISSN 2215-3608.  http://dx.doi.org/10.15517/ma.v28i2.25697.

The aim of this study was evaluated by in vitro , the effect of mixing wild sunflower ( Tithonia diversifolia ), kikuyu ( Cenchrus clandestinum ) and concentrated feed, with the addition of polyunsaturated fatty acids (AGPI) on the production of methane (CH4 ml/g MSd), dry matter digestibility (%DIVMS) and production of volatile fatty acids (AGV). The research was conducted in NUTRILAB laboratory (Medellin, Colombia) in September 2015. Three combinations of AGPI rich lipid sources were used with a total maximum inclusion level corresponding to 3% of incubated dry matter. Combinations of lipid sources were: SAGPI1: 0.5% soya oil, 0.5% fish oil, 2% rich in omega 3 bypass fat. SAGPI2: 1% Soya oil, 0.5% fish oil, 1.5% bypass fat rich in omega 3. SAGPI3: 2.5% Soya oil, 0.5% fish oil. A source of bypass fat (GSP) was also used. The results were processed using pre-planned test comparisons through the PROC MIXED-SAS.The methane production in vitro decreased (p<0.05), while the dry matter digestibility increased (p<0.05) 24 and 48 hours after wild sunflower was include and / or AGPI or both into the mixtures. In the molar ratio of AGV (%), acetic acid showed an increased presence. The inclusion of forage like wild sunflower and sources of AGPI supplementation in cattle, could be a strategy to reduce methane emissions without causing a detriment to the ruminal fermentation.

Keywords : polyunsaturated fatty acids; methanogenesis; silvopastoral system; in vitro digestibility.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )