Methane output and diet digestibility in response to feeding dairy cows crude linseed, extruded linseed, or linseed oil.

摘要: This experiment studied the effect of 3 forms presentation linseed fatty acids (FA) on methane output using sulfur hexafluoride tracer technique, total tract digestibility, and performance dairy cows. Eight multiparous lactating Holstein cows (initial milk yield 23.4 +/- 2.2 kg/d) were assigned to 4 dietary treatments in a replicated x Latin square design: control diet (C) consisting corn silage (59%), grass hay (6%), concentrate (35%) same with crude (CLS), extruded (ELS), or oil (LSO) at FA level (5.7% DM). Each experimental period lasted wk. All significantly decreased daily CH(4) emissions (P 0.05) but was ELS LSO (-3.1 -5.1 kg/d, respectively; P < 0.001). Milk fat content similar for less than C CLS (19.9 vs. 22.3 kg/d 33.8 43.2 g/kg, average, 0.01 Linseed offer promising means depress ruminal methanogenesis. The form greatly influences from negative effects production will need be overcome if it is considered as mitigation agent. Optimal conditions utilization ruminant diets determined before recommending its use industry.