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  • 1
    Electronic Resource
    Electronic Resource
    Heterosis for concentrations of dopamine, norepinephrine, their metabolites, and epinephrine in the chick hyperstriatum ventrale, hypothalamus, and optic tectum (1992)
    Springer
    Behavior genetics 22 (1992), S. 381-398 
    Details
    ISSN: 1573-3297
    Keywords: Gallus domesticus ; chicks ; diallel ; heterosis ; dominance ; overdominance ; dopamine ; norepinephrine ; epinephrine ; 3,4-dihydroxyphenylacetic acid (DOPAC) ; 3-methoxy-4-hydroxyphenylglycol (MHPG) ; hypothalamus ; hyperstriatum ventrale ; optic tectum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract A complete diallel cross using both sexes was derived from four parental populations of chickens having divergent developmental rates. This paradigm was used to investigate the genetic architecture of the neurochemicals, norepinephrine (NE), epinephrine (EPI), 3,4-dihydroxyphenylacetic acid (DOPAC), dopamine (DA), and 3-methoxy-4-hydroxyphenylglycol (MHPG). No sex differences were found for any genetic parameter investigated. Estimates of average line effects, maternal effects, and additive sex linkage were not significant. Highly significant heterosis, in the form of overdominance, was observed for catecholamine and metabolite concentrations. Hybrids exhibited significant line heterosis in the positive direction for NE, while heterosis for MHPG was observed in the negative direction for all crosses. Heterosis for EPI was both line and brain area specific with the hypothalamus showing greatest heterotic effects. DOPAC showed significant heterosis for all lines only in the optic tectum, and DA showed little heterosis specific to any line, cross, or brain area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066669
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genotype differences in catecholamine concentrations in hypothalamus, intramedial hyperstriatum ventrale, and optic tectum of newly hatched chicks (1991)
    Springer
    Neurochemical research 16 (1991), S. 105-112 
    Details
    ISSN: 1573-6903
    Keywords: Genetics ; catecholamine ; brain ; imprinting ; development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study was designed to compare catecholamine concentrations among three brain areas of four pureline populations of visually isolated chicks. The purelines used were a commercial male line, a fertility selected line, an unselected fertility control line, and unselected White Jersey Giants. In general, male chicks had significantly larger brain weights than females. Six catecholamine-related compounds (norepinephrine, epinephrine,l-DOPA, dopamine, DOPAC, and MHPG) were measured via HPLC-ECD. No significant differences in neurochemical concentration were observed for any line or brain area due to sex of the chick. The hypothalamus (HT) contained the greatest concentration of catecholamines in all lines, followed by the intramedial hyperstriatum ventrale (IMHV) and optic tectum (OT). The HT exhibited consistent lateralization in all lines with the right HT containing ca. 30% more catecholamines than the left HT. While no consistent lateralization was observed among the other brain areas, the IMHV exhibited significantly different degrees of lateralization among the populations. Neuronal activity, as measured by MHPG:NE and DOPAC:DA ratio varied by line within each brain area. There were line differences for MHPG:NE in the HT, IMHV, and OT, while line differences for DOPAC:DA were observed in the HT. Since differences among purelines have been demonstrated in this study, care must be given to precisely define the genotype of chicks used in behavioral and neurochemical research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00965696
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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