NUTRITIONAL COMPOSITION OF Arceuthobium vaginatum subsp. vaginatum AND A. globosum subsp. grandicaule AND THEIR EFFECT ON IN VITRO RUMINAL FERMENTATION KINETICS

<p><strong>Background</strong>: <em>Arceuthobium vaginatum</em> subsp. <em>vaginatum</em> (BM; black mistletoe) and globosum</em> <em>grandicaule</em> (YM; yellow mistletoe), are two parasitic plant species abundant in the forests of northern central Mexico Central America, affect 43% <em>P. </em><em>hart</em><em>wegii</em> tree population Nevado de Toluca Flora Fauna Protection Area (NTFFPA), including mistletoe as a complementary feed sheep can reduce environmental impact generated by these pests to forest also purchase for livestock. <strong>Objective</strong>: To evaluate chemical composition, phenolic content <em>in vitro</em> fermentation kinetics (M) <em>A. four age categories (AC) <em>Pinus hartwegii</em> (AC: small sapling, large juvenile adult) collected (NTFFPA). <strong>Methodology</strong>: The composition (dry matter DM; neutral detergent fiber NDF; acid ADF crude protein CP), (total phenols TP; total tannins TT condensed tannins, CT), parameters digestibility were analysed. experimental design used was completely randomized with 2x4 factorial arrangement. <strong>Results</strong>: DM different between M (P< 0.05), highest found BM. NDF M, ranging from 364.45-467.43 g/kg DM. No differences (P>0.05) observed CP which averaged 62.08 TP, CT (P<0.05), YM no effect AC. B-gas production (mL gas) presented AC sampled (P<0.05). gas rate c on average 0.042. Lag time dry organic <strong>Implications</strong>: results reported here serve tool decision making its possible inclusion forage addition diet feeding. <strong>Conclusions: </strong>The vitro </em>digestibility AC, contain secondary metabolites such have an fermentation.</p>