The dependence of lean carcass composition on carcass fat, as assessed by multivariate shape/size methods

Seebeck, RM

doi:10.1017/s0003356100001926

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…coefficients were similar for different rearing Both the prime and shank cuts of the conditions and suggested that relative growth shoulder joint had b values less than zero was not easily affected by plane of nutrition, and q values greater than 1-0, indicating that Seebeck (1983), however, showed that the these shoulder cuts are early maturing. Taken chemical composition of lean varied with the together, the brisket and neck cuts of the proportion of carcass fat.…”

Section: Allometric Growthmentioning

confidence: 86%

Breed and sex differences in equally mature sheep and goats 2. Body components at slaughter

et al. 1987

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Animals from Soay, Welsh Mountain, Southdown, Finnish Landrace, Jacob, Wiltshire Horn and Oxford Down sheep breeds and a breed of feral goats were slaughtered when 0-40, 0-52, 0-64 or 0-76 of mature body weight. The effects of stage of maturity, breed and sex were examined in the following traits: gut content as a proportion of slaughter weight; blood, omental plus mesenteric fat, perirenal fat, alimentary tract, 'remainder' of non-carcass parts and hot carcass, each as a proportion of fleece-free empty body weight; also shoulder, rib, loin and gigot joints and their commercially higher-valued (prime) and lowervalued cuts, each as a proportion of carcass weight.As a proportion, gut content declined as animals matured, as also did blood, alimentary tract, 'remainder', prime shoulder, shank and prime gigot. Increasing proportions were internal fat depots, the hot carcass, rib, loin and gigot flank. Males accumulated significantly less internal fat and more shoulder than females.When equally mature in live weight, males had proportions that were significantly lower for perirenal fat, rib and gigot and higher for shoulder and pelt plus head, feet and organs.There were significant inter-breed regressions on mature body weight. The proportion of blood, alimentary tract, pelt plus head, feet and organs, and prime gigot declined with breed size, while hot carcass, brisket, rib and loin proportions increased. These regressions were attributed to a non-random sample of breeds. The small Soay breed had proportions of internal fat and hot carcass which were well below average, and higher proportions of blood, alimentary tract and 'remainder'. Soay sheep also had a higher proportion of commercially higher-valued cuts in the carcass. In contrast, the large Oxford Down breed had low proportions of non-carcass components (except alimentary tract) and high proportions of lower-priced cuts and prime rib. Feral goats had a greater, and Southdown sheep a smaller, proportion of gut content than other breeds.

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Section: Allometric Growthmentioning

confidence: 86%

Breed and sex differences in equally mature sheep and goats 2. Body components at slaughter

et al. 1987

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“…Lipid concentration increased slightly and at about the same rate in both omental plus mesenteric and perirenal fat (b -0-05). Seebeck (1983) also found that carcasses with a higher proportion of chemical fat had less water (but more protein) in their lipid-free mass. With the exception of bone, there was a strong relationship between the initial lipid concentration and the rate of increase.…”

Section: Allometric Growthmentioning

confidence: 87%

Breed and sex differences among equally mature sheep and goats 5. Lipid in dry tissue

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. Lipid concentrations in dried tissue were obtained for perirenal fat, omental plus mesenteric fat, subcutaneous fat, carcass muscle plus associated intermuscular fat, carcass bone and offal (pelt, head, feet and organs). Lipid varied from 260 g/kg dry matter (DM) for bone to 968 g/kg for perirenal fat.As animals matured, lipid concentration increased in the dry matter of all tissues except bone, most rapidly in offal and least in intra-abdominal fat. The increases were highly correlated with the associated increases in proportion of dissected fat.Breeds differed significantly in lipid concentration in the DM of all tissues examined. Breeds with a high lipid concentration in DM of one tissue usually had high concentrations in all other tissues. The Oxford Down had the highest concentration, and the Soay and feral goat the lowest. Males had slightly lower concentrations in all tissues except internal fat.As breed size increased, mean lipid concentration (at the same stage of maturity) also increased in the DM of all tissues except bone. These breed regressions were attributed to the sampling of breeds, the smallest breeds being the exceptionally lean Soay and feral goat. Among the domesticated breeds, there were no signficant trends with breed size. , " .Lipid content of tissues t Present address:

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“…The method used for describing the relationship between multivariate shapes was developed by Seebeck (1983b). This method was evolved to take account of the fact that shape vectors which are to be related statistically are themselves each statistically related to size and that this relationship with size needs to be removed if one is to say meaningfully that the shape vectors are related.…”

Section: Discussionmentioning

confidence: 99%

“…The method for relating two shape vectors independently of size as developed by Seebeck (1983b) can be briefly stated as follows. Let Y be a shape vector of A:, elements formed by dividing the k x components by the size variable X, the sum of the A:, components.…”

Section: Discussionmentioning

confidence: 99%

“…elements of the shape vector for 'animal 83 composition', where the animal is divided into two parts, the dressed carcass and the residue. Seebeck and Tulloh (1966) first examined the relationship between yield of carcass and carcass fatness using logarithmic relationships, but a more satisfactory method of describing the relationship between multivariate shapes (of which yield of carcass and carcass composition are two examples) has been developed by Seebeck (1983b). Yield of carcass, when expressed as hot carcass weight (HCW) in relation to fasted body weight (FBW), is negatively related to rate of growth (Seebeck, 1984).…”

Section: Introductionmentioning

confidence: 99%

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Body composition of British and Zebu × British cattle in northern Australia 2. Yield of carcass and its relationship to other expressions of composition

Seebeck

1985

Anim. Sci.

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The variation in yield of carcass of Shorthorn-Hereford (SH), Africander x SH (Ax), Brahman x SH (Bx) and late-castrated Brahman x SH (Bx(late)) steers of the F, generation was examined in relationship to rate of growth and other expressions of composition.On a fasted body-weight basis, yield of carcass was shown to be related to rate of growth. Of the non-dressed-carcass parts of the body, yield of carcass was particularly related to the proportion of gut contents. When this was taken into account, the relationship between yield of carcass and rate of growth was diminished but not eliminated, and breed differences in yield of carcass still remained.Relationships between yield of carcass (relative to the empty body), carcass composition and offal composition are complex, due to the fact that each of these three shape vectors are related to size and rate of growth. Nevertheless, these shape vectors were shown to be related to each other independently of size. However, there was some confounding between the effect of rate of growth on a given shape vector and the effect of the other shape vector, particularly with respect to the relationship between yield of carcass and carcass composition. Nevertheless, it could be said that the proportion of the variation in a particular shape vector that was associated with variation in rate of growth, is explained more simply in terms of variation in another shape.Within breed, animals with a high yield of carcass had a high ratio of muscle to bone plus fascia and tendons in the dressed carcass.The large difference in yield of carcass between breeds.could be accounted for by differences in offal composition, but not by differences in carcass composition. Breed differences in carcass composition at the same size were accounted for by either yield of carcass or offal composition. However, breed differences in the relationship of carcass composition to size were not accounted for by these shape vectors. The effect of yield of carcass on carcass composition was itself accounted for by offal composition.

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The dependence of lean carcass composition on carcass fat, as assessed by multivariate shape/size methods

Cited by 7 publications

References 11 publications

Breed and sex differences in equally mature sheep and goats 2. Body components at slaughter

Breed and sex differences in equally mature sheep and goats 2. Body components at slaughter

Breed and sex differences among equally mature sheep and goats 5. Lipid in dry tissue

Body composition of British and Zebu × British cattle in northern Australia 2. Yield of carcass and its relationship to other expressions of composition

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