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The Role of Maternal Effects in Animal Breeding: VI. Maternal Effects in Beef Cattle^{1, 2,}

University of Nebraska, Lincoln 68503

Abstract

Conclusions:

1. Genetic and permanent environmental components of maternal ability and covariance of individual and maternal effects accounted for 15 to 20% of variation in birth weight and 35 to 45% of variation in daily gain from birth to weaning.
   
2. In the case of birth weight, maternal ability of dams did not have a significant direct affect on maternal ability in the next generation. Conflicting evidence of small positive and small negative values may indicate the magnitude is low and not likely to seriously bias correlations of birth weight between generations.
   
3. Maternal environment for gain from birth to weaning seems to be significantly and negatively affected by direct effects of maternal environment from previous generations. Speculation suggests a value of –.1 to –.2 for this direct path. Such values lead to estimates of environmental covariance which satisfy observed correlations and regressions. Negative direct influence between maternal ability of dam and daughter may be cause for examining alternative rearing systems for male and female calves to obtain maximum gains.
   

¹ Presented at a symposium on The Role of Maternal Effects in Animal Breeding sponsored by the American Society of Animal Science, August 3, 1971, University of California, Davis.

² Published as Paper Number 3236, Journal Series, Nebraska Agricultural Experiment Station. Contribution from North Central Regional Project NC-1, Improvement of Beef Cattle Through Breeding Methods.

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