Direct responses to selection for increased litter size, decreased age at puberty, or random selection following selection for ovulation rate in swine.

Lamberson, W. R.; Johnson, R. K.; Zimmerman, David; Long, Tiha M.

doi:10.2527/1991.6983129x

Cited by 80 publications

(65 citation statements)

References 14 publications

(12 reference statements)

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“…The estimated ratio of permanent environmental variance (c2) found in the present study is within the interval of estimates (0.00 to 0.19) reported in the literature for number of born piglets (Lamberson et al, 1991;Knap et al, 1993;Estany & Sorensen, 1994;Lourenço et al, 2008).…”

Section: Resultssupporting

confidence: 64%

Estimation of variance components, genetic parameters and genetic trends for litter size of swines

et al. 2010

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-Records of Large White breed animals were used to estimate variance components, genetic parameters and trends for the character total number of born piglets (TNBP) as measure of litter size. For obtaining variance components and genetic parameters, it was used the Restricted Maximum Likelihood Method using MTDFREML software. Two mixed models (additive and repeatability) were evaluated. The additive model contained fixed effect of the contemporary group and the following random effects: direct additive genetic and residual effect for the first parturition. Repeatability model had the same effects of the additive model plus parturition order fixed effect and non-correlated animal permanent environment random effect for the second, third and forth parturition. Direct additive heritability estimates for TNBP were 0.15 and 0.20 for the additive and repeatability models, respectively. The estimate of the ration among variance of the non-correlated effect of animal permanent environment effect and the phenotypic variance, expressed as total variance proportion (c2) was 0.09. The estimates of yearly genetic trends obtained in the additive and repeatability models have similar behaviors (0.02 piglets/sow/year).

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Section: Resultssupporting

confidence: 64%

Estimation of variance components, genetic parameters and genetic trends for litter size of swines

et al. 2010

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“…The estimate of hz for NBA was .002, much smaller than values found in many other studies (Avalos and Smith, 1987;Jorgensen, 1989;Long et al, 1990;Southwood and Kennedy, 1990;Kaplon et al, 1991a;Lamberson et al, 1991) but close to the value of ,007 obtained by Haley and Lee (1992) with DFREML. Using Model 1, Southwood and Kennedy (1990) estimated, for Canadian pigs, h: of -13, very close to the value of .14 found here.…”

Section: Geneticcontrasting

confidence: 42%

Animal model estimation of genetic parameters and response to selection for litter size and weight, growth, and backfat in closed seedstock populations of large white and Landrace swine2

Ferraz

Johnson

1993

Journal of Animal Science

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ABSTRACTranged from .01 to .14 for NBA, from .18 to .22 for LW, from .23 to .34 for ADG, and from .40 to .50 for BF. Maternal genetic variance was from 2.4 to 3.8% of phenotypic variance in NBA, from 1.2 to 3.6% in LW, from .5 to 1.5% in ADG, and from 1.9 to 3.4% in BF.The correlation between o and m was -.07 for NBA, -.25 for LW, -.34 for ADG, and -.26 for BF. Permanent environmental effects explained from 16 to 17% of total phenotypic variation for NBA and from 1.6 to 5.3% for LW. Approximately 7% of the variation in ADG and 5% in BF was due to litter environmental effects. Genetic trends were .012 pigsiyr for NBA, .25 kg/yr for LW, 5.91 g/yr for ADG, and -.063 mmlyr for BF.

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“…Subsequent selection for litter size produced a significant increase in litter size (Lamberson et al, 1991 (Tess et al, 1983;Rydhmer, 1993). Moreover, early puberty may improve genetic progress by shortening the generation interval (Hixon et al, 1987 (Ollivier, 1977(Ollivier, , 1980 (Groeneveld, 1993 (Christenson, 1981;Hutchens et al, 1982;Legault and Caritez, 1983;Allrich et al, 1985;Irgang et al, 1992).…”

mentioning

confidence: 99%

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Bidanel¹,

Legault²

1996

Genet. Sel. Evol.

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Direct responses to selection for increased litter size, decreased age at puberty, or random selection following selection for ovulation rate in swine.

Cited by 80 publications

References 14 publications

Estimation of variance components, genetic parameters and genetic trends for litter size of swines

Estimation of variance components, genetic parameters and genetic trends for litter size of swines

Animal model estimation of genetic parameters and response to selection for litter size and weight, growth, and backfat in closed seedstock populations of large white and Landrace swine2

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

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