Growth patterns for three generations of an intercross between red junglefowl and chickens selected for low body weight

Growth is a complex and dynamic process that may be measured at a specific point or over a period of time. Compared was the growth of male and female chickens over a three‐generation period. Involved were red junglefowl (RJF; Gallus gallus), a line of White Plymouth Rock chickens (LWS; Gallus gallus...

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Bibliographic Details
Published in:Journal of animal breeding and genetics (1986) 2018-08, Vol.135 (4), p.300-310
Main Authors: Sutherland, Dez‐Ann Antoinette Therese, Honaker, Christa Ferst, Dorshorst, Ben, Andersson, Leif, Brisbin, I. Lehr, Siegel, Paul B.
Format: Article
Language:English
Subjects:
Age
Asymptotes
Body weight
Chickens
Egg production
Genetic diversity
Gompertz equation
Growth patterns
Growth rate
Heterosis
Inflection points
Males
Poultry
reciprocal crosses
Resource allocation
Sexual dimorphism
Sexual maturity
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Summary:Growth is a complex and dynamic process that may be measured at a specific point or over a period of time. Compared was the growth of male and female chickens over a three‐generation period. Involved were red junglefowl (RJF; Gallus gallus), a line of White Plymouth Rock chickens (LWS; Gallus gallus domesticus) selected for low body weight, and their reciprocal F1 and F2 crosses. In both sexes, Gompertz's description of growth showed that RJF had significantly lower asymptotes, earlier inflection points, and faster growth rates than LWS. Heterosis for these measures was positive for asymptote and negative for growth rate and inflection point. The RJF commenced egg production at a significantly younger age and lower body weight than LWS. Although F1 and F2 reciprocal crosses were similar for body weight and for age at first egg, the F1 reciprocal crosses began lay at significantly younger ages than the F2 crosses and parental lines. When viewed on a physiological basis where age and body weight were simultaneously standardized, both parental lines and reciprocal F1 and F2 crosses had differing rapid and lag growth phases. Overall, sexual dimorphism increased in all populations from hatch to sexual maturity. The LWS males had a longer growth period consistent with their female counterparts who became sexually mature at older ages. Comprehensively, these results indicate additive and nonadditive genetic variation for distinct growth patterns and changes in resource allocation strategies over time.
ISSN:0931-2668
1439-0388
1439-0388
DOI:10.1111/jbg.12336