Bias Due to Corrective Matings in Sire Evaluations for Calving Ease

Dwyer, D.J.; Schaeffer, L.R.; Kennedy, B. W.

doi:10.3168/jds.s0022-0302(86)80468-4

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…These results are consistent with a number of studies: the antagonistic relationships between the direct and maternal genetic effects on different traits in dairy cattle (Dwyer et al . ; Groen et al . ) and in beef cattle (Philipsson ; Burfening et al .…”

Section: Resultsmentioning

confidence: 99%

Genetic relationship of body measurement traits at early age with carcass traits in Japanese black cattle

Munim

Oikawa

Ibi

et al. 2012

Animal Science Journal

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Estimates of genetic parameters were obtained for body measurement traits of 648 animals at 4 months of age, of 545 at 8 months and carcass traits of 14 972 animals with the use of an animal model by the restricted maximum likelihood procedure. The estimated heritabilities for carcass traits were high (0.41 to 0.54). At 4 months the estimated direct heritabilities for body measurement traits were moderate to high (0.28 to 0.64), except for chest width (0.19); at 8 months they were also moderate to high (0.23 to 0.49), except for chest depth and chest width (0.18 and 0.06, respectively). Maternal heritabilities for all body measurement traits were low at both ages. The results indicate that because of their moderate direct genetic correlations with body measurement traits, carcass weight, rib thickness and subcutaneous fat thickness can be improved; however, rib eye area and beef marbling standard show little such possibility considering their correlation with body measurement traits.

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Section: Resultsmentioning

confidence: 99%

Genetic relationship of body measurement traits at early age with carcass traits in Japanese black cattle

Munim

Oikawa

Ibi

et al. 2012

Animal Science Journal

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“…These results indicate that antagonistic relationships exist between calving ease as a trait of the calf and as a trait of the dam and that, from a genetic point of view, female calves born more easily are expected to exhibit greater difficulties when giving birth as dams. A number of studies reported antagonistic genetic relationships between direct and maternal effects on calving ease in dairy (Dwyer et al, 1986;Groen et al, 1995) and beef cattle (Burfening et al, 1981;Trus and Wilton, 1988;Cubas et al, 1991). Few studies have reported null or synergic relationships between direct and maternal effects.…”

Section: Univariate Analysesmentioning

confidence: 99%

Genetic parameters for direct and maternal calving ability over parities in Piedmontese cattle.

Carnier

Albera²,

Zotto

et al. 2000

Journal of Animal Science

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Estimates of heritabilities and genetic correlations for calving ease over parities were obtained for the Italian Piedmontese population using animal models. Field data were calving records of 50,721 first- and 44,148 second-parity females and 142,869 records of 38,213 cows of second or later parity. Calving ability was scored in five categories and analyzed using either a univariate or a bivariate linear model, treating performance over parities as different traits. The bivariate model was used to investigate the genetic relationship between first- and second- or between first- and third-parity calving ability. All models included direct and maternal genetic effects, which were assumed to be mutually correlated. (Co)variance components were estimated using restricted maximum likelihood procedures. In the univariate analyses, the heritability for direct effects was .19 +/- .01, .10 +/- .01, and .08 +/- .004 for first, second, and second and later parities, respectively. The heritability for maternal effects was .09 +/- .01, .11 +/- .01, and .05 +/- .01, respectively. All genetic correlations between direct and maternal effects were negative, ranging from -.55 to -.43. Approximated standard errors of genetic correlations between direct and maternal effects ranged from .041 to .062. For multiparous cows, the fraction of total variance due to the permanent environment was greater than the maternal heritability. With bivariate models, direct heritability for first parity was smaller than the corresponding univariate estimate, ranging from .18 to .14. Maternal heritabilities were slightly higher than the corresponding univariate estimates. Genetic correlation between first and second parity was .998 +/- .00 for direct effects and .913 +/- .01 for maternal effects. When the bivariate model analyzed first- and third-parity calving ability, genetic correlation was .907 +/- .02 for direct effects and .979 +/- .01 for maternal effects. Residual correlations were low in all bivariate analyses, ranging from .13 for analysis of first and second parity to .07 for analysis of first and third parity. In conclusion, estimates of genetic correlations for calving ease in different parities obtained in this study were very high, but variance components and heritabilities were clearly heterogeneous over parities.

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“…Dwyer et al 1986). This modification allows one to obtain an additional ouadratic form and its expectation for the computation of the covariance between bulls appearing as sire of the calf and bulls appearing as sire of the cow.…”

mentioning

confidence: 99%

Factors Affecting Gestation Length in Ontario Holsteins

Nadarajah¹,

Burnside²,

Schaeffer³

1989

Can. J. Anim. Sci.

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The mean gestation length of an Ontario Holstein population was 281.3 + 6.0 d. Parity, sex ofcalf, cow size and size ofcalfwere associated with variation in gestation length. Heritability estimates calculated from sire of the calf and maternal grand-sire of the calfvariance components were 0.33 and 0.06, respectively. Genetic correlation between direct and maternal effects for gestation length was negative and 1ow (-0.27

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Bias Due to Corrective Matings in Sire Evaluations for Calving Ease

Cited by 13 publications

References 8 publications

Genetic relationship of body measurement traits at early age with carcass traits in Japanese black cattle

Genetic relationship of body measurement traits at early age with carcass traits in Japanese black cattle

Genetic parameters for direct and maternal calving ability over parities in Piedmontese cattle.

Factors Affecting Gestation Length in Ontario Holsteins

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