MASS SELECTION FOR POST-WEANING GROWTH IN SWINE: II. RESPONSE TO SELECTION | Zendy

G. W. RAHNEFELD | Zendy

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MASS SELECTION FOR POST-WEANING GROWTH IN SWINE: II. RESPONSE TO SELECTION

Author(s) -

G. W. RAHNEFELD

Publication year - 1971

Publication title -

canadian journal of animal science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1918-1825

pISSN - 0008-3984

DOI - 10.4141/cjas71-065

Subject(s) - heritability , selection (genetic algorithm) , weaning , biology , zoology , litter , genetic correlation , population , statistics , offspring , genetic variation , mathematics , demography , genetics , agronomy , pregnancy , artificial intelligence , sociology , computer science

Recurrent mass selection for post-weaning average daily gain was practiced for seven generations in a population of Lacombe swine. Response to selection was positive, but the observed response was estimated to be only 0.33 of the predicted. The pooled estimate of additive genetic variance was 0.0013 ± 0.0002. Realized heritability was 0.126 ± 0.029. The pooled estimate of heritability obtained from components of variance and parent-offspring regression was 0.377 ± 0.058. Litter size was positively correlated with average daily gain (0.14 piglet per generation). No significant effects of selection in reducing additive genetic variance were observed.

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