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Diallel cross among lines of mice selected for litter size and body weight growth traits



Diallel cross among lines of mice selected for litter size and body weight growth traits



Zeitschrift fuer Tierzuechtung und Zuechtungsbiologie 101(2): 96-111



A diallel cross among 5 lines of mice was used to evaluate genetic differences in growth, feed intake and feed efficiency. Lines were: L+ selected for large litter size; W+ selected for large 6-wk bodyweight; L-W+ selected for small litter size and large body weight; L+W- selected for large litter size and small body weight; and K unselected control. Traits measured on male progeny were body weights at birth, 12-days, 3, 4.5 and 6-wk and 3-6 wk postweaning gain, feed intake and feed efficiency. Parameters estimated were average direct (li) and average maternal (mi) genetic effects, general combining ability (gi), direct heterosis of a cross (hij) partitioned into overall (.hivin.h), line (hi, Zi, .hivin.hi) and specific (Sij, Wij) heterosis, reciprocal (rij) and specific reciprocal (rij) effects, and net line effects (function of gi and mi). Correlated responses to selection were the results of li, mi or both. Positive correlated response for 12-day weight in W+ was due to mi, whereas negative correlated response in L+W- was caised bu li. For 6-wk weight ranking of parental lines was W+ > (L+, L-W+) > K > L+W-; rankings were W+ > L+ > L-W+ > K, L+W-) for li, and L-W+ > (W+, K) > L+ W- for mi. For feed efficiency line W+ had the largest positive correlated response, which was due to a positive li response exceeding a negative mi response. Lines W+ and L+W- had the largest .hivin.hi for 12-day weight, while L+ and L-W+ showed a lesser degree of .hivin.hi Lines L+, W+ and L-W+ had significant .hivin.Hi for 6-wk weight. Positive .hivin.Hi for feed intake was eliminated after adjustment for metabolic body size. Line L+W- exhibited negative .hivin.hi for feed efficiency. Estimates of hij for a given trait varied from moderate to negligible values, depending on the selection history of lines involved. The gi differences in 12-day weight were accounted for by a similar degree of differences in lI and hij, gi differences in 6 wk body weight and feed efficiecy were due more to li than hi, hi was an important component in determining gi for some lines. Line W+ had the largest gi and net line effects for 12-day and 6-wk body weight and feed efficiency.

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Accession: 005145559

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DOI: 10.1111/j.1439-0388.1984.tb00026.x


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