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Published byAntonio Rhodes Modified over 10 years ago
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Meat Science
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Slaughter Process wIwImmobilization wAwAnimal is rendered unconscious wdwdoes not feel pain
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Kosher Slaughter wawanimal is slaughtered under the regulations of the Jewish religion wawanimals slaughtered for Kosher markets do not have to be stunned.
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Methods wCwCarbon dioxide chamber wewelectric shock wcwcartridge or mechanical bolt
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Immobilization wawallows the heart to pump in order to drain the animals body of blood
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Exsanguination wpwprocess of bleeding the animal wuwusually done by severing the jugular vein with a sharp knife
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wbwbleeding must be done quickly to avoid hemorrhaging whwhemorrhaging can cause blood spots in the meat
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Hemorrhage wewescape of blood from ruptured blood vessels wcwcaused by a rise in blood pressure
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Hide and organs removed wlwliver wbwbrains wpwpancreas wiwintestines whwheart and kidneys
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In the US wtwthere are over 5000 plants that slaughter animals
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Hogs waware dipped into scalding water and placed on a machine that scrapes the hair from the hide wswsome plants may skin hogs
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Organs used for food wlwliver - most common wbwbrains, pancreas, intestines, and heart wkwkidneys may also be used for human consumption
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Inspectors waware present to inspect carcass and internal organs wdwdetect any health concerns
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wiwif a problem is found with the carcass, the entire carcass may be condemned weweach carcass to be sold must be inspected
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Cooling wcwcarcasses may be wrapped in a shroud wcwcarcass goes through rigor mortis wcwcarcass may be aged
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wbwbeef carcasses are split down the middle wswsides of beef are created by sawing down the backbone
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Carcasses wmwmay be divided into quarters by cutting each side in two pieces. wSwSides are divided at the 12th and 13th rib to form quarters
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wlwlamb carcasses are usually sent to the cooler whole as they are much smaller whwhog carcasses are split into sides by cutting down the backbone.
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wbwbeef and hog carcasses that have been skinned are covered in a heavy cloth soaked in salt water wcwcalled a shroud
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Shroud wpwprevents the carcass from drying out
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Carcasses waware cooled down rapidly wgwgo through rigor mortis wmwmuscles lock into place and carcass becomes stiff
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Rigor Mortis wpwphysiology is similar to muscle contractions in live animals wcwcarcass muscles do not relax
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wowonset usually takes 6 - 12 hours for beef and lamb w3w30 minutes - 3 hours for pork
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wawas enzymes and microorganisms begin to break down the muscle tissue, rigor mortis is partially relaxed
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Cooling wQwQuick cooling of meat is important to minimize protein degradation wiwinhibit growth of microorganisms
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Pork and Lamb wcwcarcasses are usually cooled for 18-24 hours before cutting
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Beef wcwcooled for 30 or more hours before cutting into wholesale cuts wmwmay also be aged in the cooler for as much as a week
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Aging wcwcarcasses undergo a period of aging to allow enzymes and microoganims to begin the process of breaking down the tissue
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wiwimproves tenderness and flavor wawadds to the expense of processing meat
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Aging alternatives wewelectric stimulation of muscles wcwcurrent of 600 volts is sent through the carcass right after slaughter and before the hide is removed
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wswstimulation speeds natural processes that occur after death wdwdepletion of energy stores from the body
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Electric stimulation wiwimproves tenderness wiwimprove color, texture and firmness wmwmakes hide removal easier
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Grading wcwcarcasses are graded according to USDA standards wfwfederal meat grading was established in 1925
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wawadministered by the AMS (Agricultural Marketing Service) of the USDA
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Grade wcwcertifies class, quality and condition with uniform standards
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Quality grades wpwprediction of the eating quality (palatability) of the meat when properly prepared
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Yield Grades wiwindicate expected yield of edible meat from a carcass and the subsequent wholesale cuts from that carcass
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Grading wiwis voluntary and is paid for by the packer
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Quality Beef Grades wpwprime wcwchoice wswselect wswstandard wcwcommercial
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wuwutility wcwcutter wcwcanner
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Grades waware determined by the age of the animal wawamount of fat intermingled with the muscle
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Age wdwdetermined by maturity of the cartilage and bones wcwcartilage hardens and turns to bone as the animal ages
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wgwgraders inspect the rib cage and vertebrae for the degree of bone and cartilage hardening - ossification
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wawas the animal ages, vertebrae in the lower end of backbone tend to fuse or grow together. wAwAnimals older than about 42 months cannot receive the highest two grades
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wywyounger animals are usually more tender than older animals
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Fat wfwfat, known as marbling wswshows up as specks of white across the rib eye wmwmore specks of fat that are visible, the higher the grade
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Prime whwhas the highest degree of fat in the muscle wfwfat gives meat its flavor and juiciness
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wfwfat is expensive to put on animals wlwleaner grades are less expensive
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Feedlot operators want their animals to grade low choice at slaughter wtwthose raising prime animals usually cater to the restaurant trade
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Beef wmwmost beef bought in the grocery store is choice grade. wAwA few market chains are selling the leaner select grade as a low fat meat
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Yield Grade wewestimate of the percentage of boneless, closely trimmed retail cuts that come from the major lean primal cuts
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Beef Yield grades w1w1 over 52.3 % lean primal cuts w2w2 50 - 52.3% w3w3 47.7-50.0 w4w4 45.4-47.7% w5w5 less than 45.4%
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Wholesale cuts wPwPrimal cuts wbwbeef wcwchuck, loin, rib and round
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wpwpork wswshoulder, loin, sides and ham
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wlwlamb wswshoulder, rib, loin, and leg
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Retail cuts wpwprimal cuts are divided into retail cuts wcwcuts of meat that the consumer buys at the grocery store
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wswsized into portions that can be easily cooked and eaten without further cutting or trimming
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Retail Cuts wmwmost expensive usually come from the loin area wmwmost tender of the muscle groups wcwchops and steaks such as the T Bone
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Trimmings waware made into sausage or ground meat wswsausage is spiced and preserved by drying or smoking
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Palatability whwhow food appeals to the palate - taste wdwdepends upon: appearance, aroma, flavor, tenderness, and juiciness
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wdwdepends upon the combination of qualities and the way it is cooked
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Appearance wbwbeef, pork and lamb vary in the shades of red color wdwdarker meats are associated with either a lack of freshness or meat from older animals
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wbwbright red gives the appearance of being fresh and wholesome
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Fat wtwthat is yellow instead of creamy white is less appealing to consumers wywyellow fat is found in certain breeds of animals that are unable to convert carotene
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wgwgrain fed cattle generally have white fat and considered to taste better than grass fed beef wgwgrass fed may have yellow fat
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Tenderness wcwcomponents of muscle that contribute to tenderness: wcwconnective tissue, state of muscle fibers, amounts of adipose (fat ) tissue
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Connective tissue wcwconnects various parts of the body wiwis distributed throughout the body
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Collagen wmwmost abundant protein the animal wmwmore activity - more collagen wawas the animal ages, collagen becomes less soluble
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Elastin wewelastic like protein found throughout the ligaments, arterial walls, and organ structures wfwfibers are easily stretched, unaffected by cooking
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Fresh Meats wWwWhen selecting, avoid extremes in apparent juiciness
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Flavor changes wowoften occur after extended storage wcwchemical breakdown of nucleotides give a desirable aged flavor
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wOwOxidation of fats results in a rancid flavor and a sharp unpleasant aroma
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Preservation and Storage wmwmeat is highly perishable wswspoils quickly wcwcreate conditions that are unfavorable to growth of spoilage organisms
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wdwdrying wswsmoking wswsalting wrwrefrigeration
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wfwfreezing wcwcanning wfwfreeze-drying
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wmwmeat provides an ideal environment for microbial growth wmwmolds wywyeast wbwbacteria
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Molds wmwmulticellular, multicolored organisms whwhave fuzzy, mildew-like appearance
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wswspread by spores that float in the air or transported by contact with objects
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Yeasts wlwlarge, unicellular bud and spore forms wswspread by contact or in air currents
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wmwmost colonies are white to creamy in color wuwusually moist or slimy in appearance or to the touch
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Microbial growth wawaffected by temperature wmwmoisture wowoxygen wpwpH physical form of the meat
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Temperature wcwcan influence the rate and kind of microbial growth
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Psychrophiles wgwgrow in cooler temperatures w3w32-68 degrees F
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Thermophiles wgwgrow best in warmer temperatures w4w45-65 degrees F
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Mesophiles wgwgrowth optimum between psycros and thermos
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Microbes wtwtemperatures below 40 degrees F greatly retard the growth of spoilage microbes and prevent growth of pathogens
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Moisture wgwgreatly affect the growth of certain microbes wmwmust have moisture to reproduce
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Oxygen wawavailability determines the type of microbe that grows wawaerobic - require free oxygen wawanaerobic - grow in the absence of oxygen
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wfwfacultative - grow with or without free oxygen wvwvacuum packaging helps to inhibit growth of aerobic organisms
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pH wowoptimum pH for most microbes is near neutral (pH 7) wMwMolds - 2.0 - 8.0 wYwYeasts 4.0 - 4.5
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wbwbacteria 5.2 - 7.0 wmwmeat and meat by products range from 4.8 - 6.8 wmwmeat conditions favor the growth of molds, yeast and acidolphilic bacteria
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Curing and Smoking wdwdocumented as far back as 850 B.C. by the Chinese wswsmoking and salting (curing) only methods of preservation known
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wiwimparts a particular flavor wfwfew people in the US still rely on curing and smoking to preserve meat
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wswsalt and nitrite - two main ingredients wswsugar, ascorbate, erythorbate, phosphates, and delta gluconolactone
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wswsalt is used in amounts to give flavor as opposed to amounts needed to preserve the meat
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wnwnitrates used to impart the cured color and flavor and inhibit bacteria action wcwcannot ammount to more than 120 ppm
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wowoldest method is dry curing wcwcure ingredients are rubbed onto surface of meat
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wiwinjection curing wpwpump curing solution (brine) into meat wswshortens curing time
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wcwcombination curing wdwdry curing and injection curing
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Refrigeration wfwfresh meat, under home refrigeration conditions should be consumed within four days of purchase
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Freezing wbwblast freezing - use high velocity air and temps af -10 C to -40 C wfwfreezes meat very quickly
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wlwlength of time meat can be kept frozen depends on temperature, species, type of product and the wrapping material on the product
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wrap using vapor proof materials wkwkeep oxygen out and moisture in wmwmoisture loss causes freezer burn
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wbwbeef - 6-12 months wlwlamb - 6-9 months wpwpork - 4-6 months wcwcured meats - 1-2 months
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Drying wlwlow moisture foods contain less than 25% moisture wBwBeef Jerky is an example of a low moisture food
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wiwintermediate moisture less than 50% wdwdry salami
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