A comparison of breast muscle characteristics in three broiler great-grandparent lines

Vicky E MacRae*, Michael Mahon, Sally Gilpin, Dale Sandercock, Richard R Hunter, Malcolm A Mitchell

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Genetic selection of broiler chickens has led to a gross overdevelopment of the broiler breast muscle pectoralis major. This may have resulted in increased myopathy and detrimental effects on meat quality. The present study examined 3 commercial great-grandparent lines (lines A, B, and C). Lines A and B are female lines, and line C is a male line. The mean BW of line C (2.7 kg) was significantly greater than those of lines A and B (both 2.3 kg). However, the mean breast yield of both lines B and C (8.9 and 8.7%, respectively) was significantly greater than that of line A (6.9%). Line B therefore matched the meat yield of line A while maintaining a high reproductive capacity. The mean breast fillet weight of line A (169 g) was significantly lower than lines B (207 g) and C (235 g). No differences were observed between lines in either mean fiber size or amount of connective tissue. Therefore, additional fibers must provide the additional weight in the breast fillet of lines B and C, compared with A. Plasma creatine kinase activity, a commonly used marker of muscle damage, was significantly higher in line A (1368 IU/L) than in lines B (995 IU/L) and C (982 IU/L). However, qualitative evaluations of muscle pathology revealed no differences among lines. Selection for increased embryonic muscle fiber number, rather than for increased radial fiber growth, could improve growth potential and may also alleviate muscle damage.
Original languageEnglish
Pages (from-to)382-385
JournalPoultry Science
Volume86
DOIs
Publication statusPrint publication - 1 Feb 2007
Externally publishedYes

Fingerprint

grandparents
breast muscle
breasts
Breast
dietary fiber
broiler chickens
fillets
Muscles
muscles
Meat
line differences
muscular diseases
creatine kinase
Pectoralis Muscles
Weights and Measures
muscle fibers
connective tissues
meat quality
Genetic Selection
reproductive performance

Keywords

  • Broiler
  • Myopathy
  • Muscle damage
  • Muscle fibre number
  • Histopathology
  • Growth rate
  • Hypertrophy
  • Skeletal muscle
  • Production pathology
  • Muscle pathology

Cite this

MacRae, Vicky E ; Mahon, Michael ; Gilpin, Sally ; Sandercock, Dale ; Hunter, Richard R ; Mitchell, Malcolm A. / A comparison of breast muscle characteristics in three broiler great-grandparent lines. In: Poultry Science. 2007 ; Vol. 86. pp. 382-385.
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A comparison of breast muscle characteristics in three broiler great-grandparent lines. / MacRae, Vicky E; Mahon, Michael ; Gilpin, Sally; Sandercock, Dale; Hunter, Richard R; Mitchell, Malcolm A.

In: Poultry Science, Vol. 86, 01.02.2007, p. 382-385.

Research output: Contribution to journalArticle

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T1 - A comparison of breast muscle characteristics in three broiler great-grandparent lines

AU - MacRae, Vicky E

AU - Mahon, Michael

AU - Gilpin, Sally

AU - Sandercock, Dale

AU - Hunter, Richard R

AU - Mitchell, Malcolm A

PY - 2007/2/1

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N2 - Genetic selection of broiler chickens has led to a gross overdevelopment of the broiler breast muscle pectoralis major. This may have resulted in increased myopathy and detrimental effects on meat quality. The present study examined 3 commercial great-grandparent lines (lines A, B, and C). Lines A and B are female lines, and line C is a male line. The mean BW of line C (2.7 kg) was significantly greater than those of lines A and B (both 2.3 kg). However, the mean breast yield of both lines B and C (8.9 and 8.7%, respectively) was significantly greater than that of line A (6.9%). Line B therefore matched the meat yield of line A while maintaining a high reproductive capacity. The mean breast fillet weight of line A (169 g) was significantly lower than lines B (207 g) and C (235 g). No differences were observed between lines in either mean fiber size or amount of connective tissue. Therefore, additional fibers must provide the additional weight in the breast fillet of lines B and C, compared with A. Plasma creatine kinase activity, a commonly used marker of muscle damage, was significantly higher in line A (1368 IU/L) than in lines B (995 IU/L) and C (982 IU/L). However, qualitative evaluations of muscle pathology revealed no differences among lines. Selection for increased embryonic muscle fiber number, rather than for increased radial fiber growth, could improve growth potential and may also alleviate muscle damage.

AB - Genetic selection of broiler chickens has led to a gross overdevelopment of the broiler breast muscle pectoralis major. This may have resulted in increased myopathy and detrimental effects on meat quality. The present study examined 3 commercial great-grandparent lines (lines A, B, and C). Lines A and B are female lines, and line C is a male line. The mean BW of line C (2.7 kg) was significantly greater than those of lines A and B (both 2.3 kg). However, the mean breast yield of both lines B and C (8.9 and 8.7%, respectively) was significantly greater than that of line A (6.9%). Line B therefore matched the meat yield of line A while maintaining a high reproductive capacity. The mean breast fillet weight of line A (169 g) was significantly lower than lines B (207 g) and C (235 g). No differences were observed between lines in either mean fiber size or amount of connective tissue. Therefore, additional fibers must provide the additional weight in the breast fillet of lines B and C, compared with A. Plasma creatine kinase activity, a commonly used marker of muscle damage, was significantly higher in line A (1368 IU/L) than in lines B (995 IU/L) and C (982 IU/L). However, qualitative evaluations of muscle pathology revealed no differences among lines. Selection for increased embryonic muscle fiber number, rather than for increased radial fiber growth, could improve growth potential and may also alleviate muscle damage.

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KW - Myopathy

KW - Muscle damage

KW - Muscle fibre number

KW - Histopathology

KW - Growth rate

KW - Hypertrophy

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KW - Production pathology

KW - Muscle pathology

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JF - Poultry Science

SN - 0032-5791

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