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dram now meant only avoirdupois drams, which were 1 ⁄ 16 of an avoirdupois ounce. An ounce consisted of 437.5 grains, thus making the dram exactly 27.34375 grains. drachm now meant only apothecaries' drachms, which were 1 ⁄ 8 of an apothecaries' ounce of 480 grains, or equal to 60 grains.
English-speaking countries also used a system of units of fluid measure, or in modern terminology volume units, based on the apothecaries' system. Originally, the terms and symbols used to describe the volume measurements of liquids were the same as or similar to those used to describe weight measurements of solids [33] (for example, the pound by weight and the fluid pint were both referred to ...
Troy weight, avoirdupois weight, and apothecaries' weight are all built from the same basic unit, the grain, which is the same in all three systems. However, while each system has some overlap in the names of their units of measure (all have ounces and pounds), the relationship between the grain and these other units within each system varies.
The grain was the legal foundation of traditional English weight systems, [5] and is the only unit that is equal throughout the troy, avoirdupois, and apothecaries' systems of mass. [6]: C-6 The unit was based on the weight of a single grain of barley which was equal to about + 4 ⁄ 3 the weight of a single grain of wheat.
The scruple is 8 ⁄ 175 of an ounce (or 1 ⁄ 24 of a troy ounce), 1 ⁄ 3 dram, or 20 grains: [1] it is therefore exactly 1.2959782 grams. The Roman scruple was 11.875% smaller, therefore being exactly 1.14208078875 grams.
dram now meant only avoirdupois drams, which were 1 ⁄ 16 of an avoirdupois ounce. An ounce consisted of 437.5 grains, thus making the dram approximately 27.34 grains. drachm now meant only apothecaries' drachms, which were 1 ⁄ 8 of an apothecaries' ounce of 480 grains, thus equal to 60 grains.
In 1588 Queen Elizabeth increased the weight of the avoirdupois pound to 7000 grains and added the troy grain to the avoirdupois weight system. Prior to 1588, the "part" (1 ⁄ 16 ounce) was the smallest unit in the avoirdupois weight system. In the 18th century, the "part" was renamed "drachm".
As for the inputs portion, although FCR is commonly calculated using feed dry mass, it is sometimes calculated on an as-fed wet mass basis, (or in the case of grains and oilseeds, sometimes on a wet mass basis at standard moisture content), with feed moisture resulting in higher ratios. [11]