Yield Testing Your Own Carcasses
- Run a five-stage weighing test that produces your own dressing, shrink and cutting yield figures
- Compare your measured yields against published ranges and explain the differences
- Calculate the yield cost of dry ageing before deciding to sell aged meat
Module 1 gave you published yield ranges and a worked example. This lesson is about replacing those published figures with your own. Averages from another country tell you the shape of the problem. Only your own scale tells you the size of it in your shop, with your suppliers, your animals and your chiller.
A yield test is five weighings and one sheet of paper per carcass.
- Live weight, on a scale, under a consistent rule about feed and rest, so that your own records stay comparable to each other.
- Hot carcass weight, immediately after dressing.
- Cold carcass weight, after 24 hours in the chiller.
- Every category as you cut it: bone-in cuts, boneless cuts, trim, offal, bone, and anything discarded. Weigh each category into its own tub. Do not estimate the last one because you are tired.
- The total. Your category weights plus your losses should come close to your cold carcass weight. If they do not, you have missed a stream, and a missing stream is either meat you are giving away or meat somebody is taking.
Now calculate three percentages of your own. Dressing percentage is hot carcass divided by live weight. Chilling shrink is the loss from hot to cold, as a percentage of hot weight. Cutting yield is saleable meat divided by cold carcass weight.
Compare them with the published ranges. Grain-fed beef dresses at 60 to 63 percent and grass-fed at 56 to 58, with a second source giving beef generally 60 to 64. Pork skin-on is 70 to 73, reported elsewhere as 70 to 75. Shorn sheep is 50 to 53, with a second source giving lamb 54 to 59. Goat is 45 to 50. The disagreement between sources is itself the lesson: nobody has your number, so measure it.
Chilling shrink is 3 to 5 percent of hot carcass weight in the first 24 hours, and goat shrinks significantly more, up to 10 percent. If your measured shrink comes out above the published range, look at your chiller loading before you blame the animal. A published technical reference records approximately 1 percent loss from a chiller holding fifty 150 kg bodies, against approximately 2 percent from the same room holding twenty-five. A half-empty chiller doubles your shrink. That is money evaporating off your carcasses because you did not fill the room or did not buy the right size of room.
For cutting yield, published figures give beef 65 to 70 percent bone-in and 55 to 60 percent boneless; pork 75 to 80 bone-in and 65 to 70 boneless; lamb 70 to 75 bone-in. Bone alone is 15 to 20 percent of a carcass. Published worked examples are useful sanity checks: a 1,200 lb, or 544 kg, beef carcass yields about 500 lb, 227 kg, of bone-in cuts at quarter-inch trim, or about 425 lb, 193 kg, of boneless steaks and roasts at eighth-inch trim, or about 490 lb, 222 kg, of mixed cuts. A 250 lb, 113 kg, pork carcass gives about 133 lb, 60 kg, of bone-in chops and roasts, or about 118 lb, 54 kg, boneless. A 120 lb, 54 kg, shorn lamb carcass gives about 46 lb, 21 kg, of bone-in chops and roasts.
For goat, carcass-to-retail cutting yields were not verified for this course and none is given. Do not assume the lamb figures transfer, because goat carcasses dress lower and are leaner and smaller. Obtain a goat-meat extension publication from a national agricultural research institute or a university small-ruminant programme, and in the meantime build your own figure from your own weighing sheets. If goat is a serious part of your trade, ten weighed carcasses will give you a better working number than any book will.
One more yield question decides whether a whole product line is possible. Dry ageing costs weight. Cooler shrink over the ageing period runs 6 to 15 percent overall: about 5 percent at 14 days, 10 percent at 21 days, 15 percent at 30 days and 35 percent at 120 days. On top of that, removing the crust costs a further 3 to 24 percent depending on duration and muscle. Work a 30-day age: 15 percent shrink and, say, 15 percent trim leaves 0.85 multiplied by 0.85, which is about 72 percent of the starting weight as saleable product. Your price has to carry that 28 percent loss before it carries labour, rent or profit. Against that, shear force fell 17 percent between 14 and 35 days of dry ageing, and peak flavour develops at 42 to 49 days with diminishing returns beyond. Ageing is a real product, but it is a product you must price with a calculator, not with enthusiasm.
Do the test on three carcasses, not one. One animal is an anecdote. Three give you an average you can price against and a spread that tells you how much variation to allow for.