Meat yield in Turkeys

Clayton, G. A.; Nixey, C.; Monaghan, G.

doi:10.1080/00071667808416540

Cited by 27 publications

(16 citation statements)

References 4 publications

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“…Direct selection for increased growth rate and increased amount of breast muscle caused total body weight and the amount of breast muscle to increase at a faster rate than that observed for the muscles of the legs (Marsden, 1940;Miller, 1968;Clayton et al, 1978). Selection for increased 16-wk body weight in Line F increased the relative amount of breast muscle at 16 and 20 wk of age (Table 1), whereas the relative increase with age in total leg muscle was less in Line F than in the RBC2 line.…”

Section: Resultsmentioning

confidence: 94%

Comparison of Bone and Muscle Growth in Turkey Lines Selected for Increased Body Weight and Increased Shank Width

et al. 1987

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A subline (FL) of a long-term growth-selected line (F) of turkeys was established by mass selecting solely for increased shank width at the narrowest point (dew claw). A comparison was made of bone and muscle growth in Line FL (fourth generation of selection), Line F (17th generation of selection), and a randombred control (RBC2, the base population of F) at 8, 16, and 20 wk of age. Also, a sample of the tibiotarsal and femur bones was studied histologically for evidence of pathological conditions. No significant pathological changes were observed in bones from turkeys of the different lines at the ages examined. Samples for histological study were taken at Day 1, 27, 56, 84, 112, and 140 posthatching. Genetic increases in body weight (F and FL lines) resulted in a significant decline in the relative amount of leg muscles from 16 to 20 wk of age while in Line RBC2 the relative amount of leg muscles increased slightly from 16 to 20 wk of age. This resulted in a significant line x age interaction. No significant differences in the amount of leg muscles were detected between turkeys of Lines F and FL. Amount of breast muscles increased consistently with age in all lines. Amount of breast muscles (absolute and as a percentage of body weight) was larger in Line F than in the FL and RBC2 lines. The actual weight of the breast muscles was larger in Line FL than in the RBC2 line but as a percentage of body weight there was no significant difference.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Resultsmentioning

confidence: 94%

Comparison of Bone and Muscle Growth in Turkey Lines Selected for Increased Body Weight and Increased Shank Width

et al. 1987

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“…The relative amount of leg muscle also declines with age as the birds get heavier (Harshaw and Rector, 1940). The skeleton exhibits a similar relative decline with age (Clayton et al, 1978). Thus, we hypothesize that there appears to be a biologically incompatible combination in the present commercial turkeys of increased body weight with relatively less support (leg muscles and bones), and this inherent stress probably magnifies the effect of the various causes of leg problems.…”

Section: Introductionmentioning

confidence: 82%

“…Journal Article No. 41-85. Direct selection for increased amount of breast muscle as well as for greater body weight has increased total body weight and amount of breast muscle at a faster rate than the increase observed in the muscles of the legs (Marsden, 1940;Miller, 1968;Clayton et al, 1978). The relative amount of leg muscle also declines with age as the birds get heavier (Harshaw and Rector, 1940).…”

Section: Introductionmentioning

confidence: 91%

The Influence of Genetic Increases in Shank Width on Body Weight, Walking Ability, and Reproduction of Turkeys

Nestor

Bacon

et al. 1985

Poultry Science

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Body weight and breast width have been greatly increased in the modern turkey. However, the relative amounts of leg muscles and leg bones have declined. A similar decline also occurs with age. It was theorized that this is an inherent weakness that magnifies other causes of leg problems. In an attempt to increase the relative amount of leg bone, a subline (FL) was developed by mass selection for increased shank width at 16 weeks of age from a long-term growth-selected line of turkeys (F). Shank width of FL was increased greatly by selection. The realized heritability of shank width, based on the regression of accumulated selection response on accumulated selection differential, was .33 +/- .05 over five generations of selection. Body weight of males from FL increased at a rate comparable to that of F at 16 weeks of age. However, there was no comparable improvement in body weight of FL females, resulting in a significant line X sex interaction. A similar interaction was observed for body weight at 8 and 20 weeks of age in these lines. The genetic increases in shank width in FL resulted in significantly improved walking ability of males at 16 weeks of age in comparison to F, even though body weight of males from the two lines was similar. The walking ability of FL did not change relative to the control line from which F originated. Thus, large genetic increases in body weight of males can be achieved without loss in walking ability by genetic increases in shank width.(ABSTRACT TRUNCATED AT 250 WORDS)

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“…Direct selection of turkeys for rapid and heavy breast muscle growth has resulted in higher total body weights and disproportionately heavy breast muscles compared with leg muscles (1,2). A redistribution of body weight toward breast muscle deposition rather than leg muscle may limit the mobility of heavy strains of turkeys (2,5).…”

Section: Discussionmentioning

confidence: 99%

Femoral Fractures in a Young Male Turkey Breeder Flock

Crespo¹,

Stover²,

Droual³

et al. 1999

Avian Diseases

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Twenty-two 32-to-35-wk-old male turkeys from a commercial breeding flock were presented to the California Veterinary Diagnostic Laboratory System, Fresno Branch, with a clinical complaint of lameness and increased mortality. Necropsy findings included a unilateral, closed oblique fracture involving the femur in 12 birds. Ten complete femoral fractures had periosteal new bone adjacent to and bridging the fracture. Periosteal callus formation, in this case, suggested that preexisting lesions preceded complete fracture of the femur. Factors such as selection for heavy body weight, lack of exercise, and handling might have contributed to the development and promotion of complete fractures.

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Meat yield in Turkeys

Cited by 27 publications

References 4 publications

Comparison of Bone and Muscle Growth in Turkey Lines Selected for Increased Body Weight and Increased Shank Width

Comparison of Bone and Muscle Growth in Turkey Lines Selected for Increased Body Weight and Increased Shank Width

The Influence of Genetic Increases in Shank Width on Body Weight, Walking Ability, and Reproduction of Turkeys

Femoral Fractures in a Young Male Turkey Breeder Flock

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