Breed and sex differences in equally mature sheep and goats 3. Muscle weight distribution

Thonney, M. L.; Taylor, St C. S.; Murray, J. I.; McClelland, T. H.

doi:10.1017/s0003356100018857

Cited by 19 publications

(5 citation statements)

References 13 publications

(33 reference statements)

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“…3) g/kg more of their muscle in the prime shoulder than did females and 19 (s.e. Similar results have been found in studies of individual muscles (Lohse, 1973;Jury et al, 1911;Thonney et al, 1987c). Secondary sex characteristics were also reflected in males containing 10 (s.e.…”

Section: Genetic Effects Of Sex and Breed On Mean Body Compositionsupporting

confidence: 87%

Breed and sex differences among equally mature sheep and goats 4. Carcass muscle, fat and bone

1989

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Males and females from Soay, Welsh Mountain, Southdown, Finnish Landrace, Jacob, Wiltshire Horn and Oxford Down sheep breeds and a breed of feral goats were slaughtered when proportionately 0-40, 0-52, 0-64 or 0-76 of mature live weight. On average, carcasses contained 583 g muscle, 243 g fat and 174 g bone per kg. Individual cuts (four commercially higher-valued and six lower-valued cuts of the shoulder, rib, loin and gigot joints) ranged from 375 to 670g muscle, 129 to 625 g fat and 0 to 294 g bone per kg.Allometric coefficients are given for 32 traits. The distribution of bone in the carcass joints changed little as animals matured but carcass muscle and fat distributions changed significantly.Breeds differed significantly in proportion of carcass muscle, fat and bone and also in their distribution. Welsh Mountain, Southdown, Wiltshire and Oxford Down all deposited carcass fat about three times more rapidly than did the Soay, goat, Finnish Landrace and Jacob. The Oxford Down had the lowest proportion of muscle (514 g/kg) and most fat (317 g/kg). The Southdown had least bone (148 g/kg) and the feral goat most muscle (662 g/kg). Southdown and Soay had the most muscle in commercially higher-valued cuts and Jacob and feral goat the least. Males had significantly more of their muscle in the neck and shoulder and significantly less in the gigot and flank.As breed size increased, proportion of carcass muscle and bone decreased and proportion of carcass fat increased. These breed regressions were attributed to the small but exceptionally lean feral Soay and goat breeds, rather than to a failure of genetic size-scaling. There were no significant trends with breed size among the domesticated breeds. t , r t " . u^n a ;" o quantified by allometry and also by the T H E proportion of muscle, fat and bone in a M J . J J u i I » • n •• v slaughtered at four degrees of maturity. c u s ' Changes in proportions of muscle, fat and MATERIAL AND METHODS

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Section: Genetic Effects Of Sex and Breed On Mean Body Compositionsupporting

confidence: 87%

Breed and sex differences among equally mature sheep and goats 4. Carcass muscle, fat and bone

1989

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“…Meat proportions of the breast rib and neck did not change significantly ( Table 4), while that of the flank was a mirror image of changes in SCF (Table 2), by declining between fat scores 1 to 3 with no significant variation between fat scores 3 and 5. As a result of the high increase in SCF proportions over all fat scores, % meat in the loin declined significantly (P <0.05) between fat score 1 and 5 While some work has been reported on the proportional development of muscles in cattle (Berg & Butterfield (1978) and sheep (Lohse et al, 1971;Palsson & Verges, 1952;Thonney et al, 1987), it is difficult to relate these results with the yield of commercial cuts, since anatomical muscle grouping often extends over cuts or various groups are contained within a commercial cut. Moreover, meat and not muscle yield was reported in the present study and therefore IMF was included in the proportions reported.…”

Section: Resultsmentioning

confidence: 97%

The influence of fat score and fat trimming on primal cut composition of South African lamb

Strydom¹,

Heerden²,

Schönfeldt³

et al. 2009

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe objectives of this study were to evaluate the primal cut composition of South African lamb carcasses with different fat scores, and to identify cuts suitable for fat trimming. Sixty grain fed Dorper lambs (rams and ewes) were divided into three groups and slaughtered at 30, 36 and 42 kg. Chilled carcass sides were subdivided into seven primal cuts. The cuts were dissected into meat (muscle, intermuscular and intramuscular fat), bone and subcutaneous fat (SCF) in order to determine the physical composition per cut and for the whole carcass. The % subcutaneous fat (SCF) in the loin increased the most (26 units) as the fat score increased from 1 to 5, followed by the flank, shoulder and neck. The % meat (lean) of the neck, thick rib and breast showed no significant change between fat scores 1 to 5, while % bone decreased significantly (>6% units). Meat and bone proportions decreased significantly with an increase in fat score for the loin, flank, leg and shoulder. The composition of the loin cut was most affected overall by changes in the fat score. Since different cuts accumulate SCF at different rates during fattening, trimming of SCF could reduce the boneless % SCF level of the major cuts such as the loin, leg and shoulder by 12, 6 and 9 units, respectively, when trimmed from SCF equal to a fat score 5 to a fat score 3. Further trimming to levels equal to a fat score 1, could reduce the % SCF by 18, 8 and 5 units, respectively on a boneless level. Considering differences in relative increase in intermuscular fat (IMF) and SCF in different cuts, the leg seems to be the most suitable cut for trimming in fat carcasses, since the IMF : SCF ratio is the lowest compared to the other larger cuts namely the loin and shoulder.________________________________________________________________________________

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“…The larger eye muscle areas in the Southdown cross lambs at a set carcass weight may be a reflection of the fact that this breed has been shown to have a slightly higher proportion of longissimus muscle to total muscle in comparisons where this breed was included (Taylor et al 1980;Thonney et al 1987). This muscle comprised 9.6% of muscle in the Southdown lambs and 7.7% in the Finn lambs.…”

Section: Discussionmentioning

confidence: 94%

A comparison between 15 ram breeds for export lamb production 1. Liveweights, body components, carcass measurements, and composition

Kirton

Carter

Clarke

et al. 1995

New Zealand Journal of Agricultural Research

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Results on the body and carcass composition of 7885 lambs sired by 371 rams of 15 different breeds mated to Romney cast-for-age ewes are given. Trials were run at the Ruakura Agricultural Centre and the Manutuke Research Station from 1963 to 1972. Lambs of the different breeds were slaughtered at the same average age so that differences between breeds/crosses in liveweight and carcass weight reflected differences in growth rate. Ranked from heaviest to lightest mean age-adjusted carcass weights, lambs sired by the Dorset Horn, Poll Dorset, Hampshire, Border Leicester, Suffolk, Dorset Down, South Suffolk, and South Dorset Down produced the heaviest carcasses, and those sired by the Cheviot, Southdown, English Leicester, and Ryeland were intermediate. The Lincoln, Merino, and Romney sired carcasses were lighter. The longer-woolled Romney, Merino, and Lincoln had lowest dressingout percentages based on full liveweights and the short finer-wooled breeds such as the Southdown, Dorset Down, and Poll Dorset/Dorset Horn dressed 2-3% higher. When compared at the same carcass weight, lambs sired by the Southdown followed by the Ryeland had the fattest carcasses and those A94091Received 26 September 1994; accepted 27 April 1995 1 Deceased sired by the Suffolk, Cheviot, and Dorset Horn produced the least fat, leanest carcasses. The Southdown, Dorset Horn, South Dorset Down, and Poll Dorset crosses had the largest eye muscle areas for carcasses of similar weight.

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Breed and sex differences in equally mature sheep and goats 3. Muscle weight distribution

Cited by 19 publications

References 13 publications

Breed and sex differences among equally mature sheep and goats 4. Carcass muscle, fat and bone

Breed and sex differences among equally mature sheep and goats 4. Carcass muscle, fat and bone

The influence of fat score and fat trimming on primal cut composition of South African lamb

A comparison between 15 ram breeds for export lamb production 1. Liveweights, body components, carcass measurements, and composition

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