Genetic control of embryonic cardiac growth and functional maturation in turkeys

Poultry Science
V L ChristensenS G Velleman

Abstract

Turkey experimental lines E (selected 44 yr for increased total egg production) and F (selected 38 yr for increased 16-wk BW) were mated reciprocally with the randombred control lines from which they were derived (RBC1 and RBC2, respectively), and the pureline and reciprocal cross poults were compared for their BW, heart weight, heart rates, myocardial glycogen and lactate concentrations, and plasma creatine kinase (CK) and lactate dehydrogenase (LDH) activities. The CK and LDH were used as indicators of cardiac insufficiency. Orthogonal contrasts of the data from the pureline and reciprocal cross data were used to estimate additive genetic effects, reciprocal effects (confounded maternal and sex-linked effects), and heterosis for each of the traits measured. Long-term selection for increased egg production in the E line has reduced embryo heart weight and has altered the energy metabolism of the myocardium. The differences in energy metabolism may be due to the more rapid heart rates. Conversely, long-term selection for increased 16-wk BW has significantly decreased the heart rate of F line embryos and has not changed the weight of the heart relative to the BW until the embryo has passed through the plateau stage. The F line e...Continue Reading

References

Feb 1, 1990·Journal of Comparative Pathology·S M MirsalimiP J O'Brien
Jan 1, 1989·Comparative Biochemistry and Physiology. A, Comparative Physiology·L G Bagley, V L Christensen
Nov 1, 1967·The Journal of Experimental Zoology·V Hamburger, R Oppenheim
Nov 1, 1982·Respiration Physiology·I E McCutcheonT Ettinger
Nov 1, 1981·Respiration Physiology·J MetcalfeJ E Welch
Aug 3, 2004·Poultry Science·S G Velleman, K E Nestor
Feb 14, 2007·Poultry Science·V L ChristensenG B Havenstein

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