The amount of feed demand per unit of output (meat or milk) varies between world regions by factors of up to 10, due to the differences in animal husbandry systems [49].
Other practices, like adding certain proteins to ruminant diets, can reduce methane production per unit of milk or meat by a factor of six, according to research at Australia's University of New England.
We calculated the lead content of such a meal from the arithmetic mean lead concentration, per unit weight of meat, for the species concerned, including the lead associated with both the meat and sauce components of the meal, for those meals that included sauce.
The unit VWC was estimated per unit weight of meat (e.g., per ton).
We observed a 0.09% increase of high molecular weight phthalates, a 0.02% increase in DEHP metabolites, a 0.11% increase in MEHP, a 0.10% increase in MEHHP and a 0.10% increase in MEOHP per unit consumption of meat, poultry, and fish intake.
An increase in N-input per hectare increased the amount of N-produce in milk and meat per hectare, but, on average for all farms, only 11% of the N-input was utilised as N-output; however, the N-surplus per unit of N in produce (delivered milk and meat gain) was not correlated to total N-input.
8 Therefore, to allow comparison between populations, risk should ideally be reported per unit of exposure, e.g. per 100 g meat intake per day.
Production of CH4 (and other GHGs) per unit of animal product (e.g. milk, meat) has declined over the past 50 years in most ruminant livestock industries in developed countries due to ongoing improvements in animal productivity.
In her paper on food security in the context of a growing demand for protein, Dr Hanna Tuomisto calculates that the algae (along with 'in vitro' meat) has the lowest land use per unit of protein and unit of human digestible energy.
