The task of the research was to state the peculiarities of the farm animal breeding technologies that are most widespread in Latvia with the purpose to use the research results for calculation of greenhouse gas emissions (GHG). With a view to this, it was necessary to state the length of the farm animal pasturing (grazing) period as well as the sizes of the herds at which the transition from production of solid litter manure to liquid manure or manure without solid litter (for laying hens) takes place. The expert method was used in the research. The research results show that the longest pasture (grazing) period is for cattle (they spend in pastures 85 % of the total number of hours per year), but the shortest – for goats and milk cows (they spend in pastures 14.6 and 18.8 % of the total number of hours per year). It is to a great extent related to the necessity to milk these animals. In turn, transition from production of solid litter manure to liquid manure for cows takes place, if the size of the herd reaches 85 cows, for pigs – if this number reaches 500 pigs, but for laying hens the transition from production of litter manure to manure without litter, i.e. to keeping the poultry in cage batteries – if this number reaches 1000 laying hens.