Of course with clean animals, raised organically, it probably wouldn't matter, but we can't always be certain about that.
Does anyone else know or can direct me to a source?
All I have to contribute to the discussion is this quote,
Between 1910 and 1980 many changes took place to the kinds and amounts of fats and oils that people ate...Fats and oils (shortening, margarine, refined salad and cooking oils) account for 57%, dairy products account for 7%, and meat, poultry, and fish account for 31% of the total increase in our fat consumption. The average intake of trans-fatty acids in hydrogenated products rose from zero in 1910 to close to 10% of all fats we consume today... Our use of butter declined to 1/5 of its 1910 level, while our use of margarine increases 9 times. The use of lard went down to about 1/5 of its former level, while the use of vegetable shortenings almost doubled in the same time span...Our annual consumption of sugar rose from 15 pounds per person in 1815 to about 90 pounds in 1910, about 120 pounds in 1980 and about 135 pounds today. Cholesterol intake from foods has remained essentially constant during the last 70 years... consumption of linoleic acid (18:2w6) increased by 170%. The consumption of w3s (LNA, EPA, DHA) decreased to 1/6 of its level in 1850, while w6 (LA, AA) consumption doubled during that time, resulting in widespread w3 deficiency and serious w3:w6 imbalance. Udo Erasmus Fats the Heal, Fats that Kill