After the identification of 5-10% of trans-unsaturated acids, mainly elaidic (trans-octadec-9-enoic) and vaccenic (trans-octadec-11-enoic), in ox fat (Swern, Knight & Eddy, 1952), it has been shown in this Laboratory (Hartman, Shorland & McDonald, 1954, 1955) that substantial amounts of these acids appear in the depot fats of other ruminants (3-5-11-2 %) and in certain marsupials (18-1-21-0 %),...

Nitrogen is an essential nutrient for ryegrass growth and development but excess of it may lead to accumulation nitrate in plants which be lethal ruminants. Irrigation, seed rate, variety, quality, cutting time frequency, location alittude fertilizer types are variables the different articles this review we selected see reaction Italian rygrass nitrogen doses core. A series comments were also m...

Ruminant animals play an important role in the food chain for evaluate cellulose and non-protein nitrogenous (NPN) compounds absorbed partially or not by other farm animals and humans. However, ruminant animals also bring some disadvantages. Methane, produced as a natural consequence of the ruminal digestion and it is a potential green house gas, is a problem, both ecologically and economically...