Kikuyu grass in winter-spring time in small-scale dairy systems in the highlands of central Mexico in terms of cow performance and fatty acid profile of milk.

摘要: The work herein reported closes the evaluation of role kikuyu grass in small-scale dairy systems highlands Mexico. objective was to compare productive response vacas lecheras en pastoreo continuo de (Cenchrus clandestinus) with a sown frost-resistant tall fescue (Lolium arundinaceum) during winter-spring dry season and determine fatty acid profile feeds milk. An on-farm double cross-over experiment three periods 14 days each undertaken eight Holstein cows randomly assigned treatments sequence. Treatments were daytime grazing for 8 h/d Cajun II endophyte free pasture invaded by (CJ) or naturally (KY), both associated white clover (Trifolium repens) annual ryegrass multiflorum). Cows supplemented pens 6.0 kg DM/cow/day maize silage 4.6 commercial concentrate. profiles milk determined gas chromatography. There differences (P<0.05) net herbage accumulation chemical composition between pastures, but not vitro digestibility estimated metabolizable energy. In animal variables, protein content higher KY (P<0.05). significant among experimental fat urea nitrogen highest values Period 3. Pasture DM intake lowest terms content, there interactions vaccenic (C18:1t11) linoleic (C18:2c9c12) Linolenic (C18:3c9c12c15) when grazed significantly It is concluded that pastures complemented concentrates perform as scarcity. Milk from has linolenic an atherogenic index favorable human health.