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Selection for Ovulation Rate in Swine: Population, Procedures and Ovulation Response¹

University of Nebraska, Lincoln 68503^{,3, 4,}

Abstract

Five generations of selection for ovulation rate in swine have been applied in a multi-breed synthetic line of swine. Corpora lutea were counted on 845 gilts in each of two lines. Mass selection was practiced for number of corpora lutea in one line with the other line serving as a control. Inbreeding levels were less than 1% and similar for both lines. Mean ovulation rates were 14.4 for the Select line vs 14.6 for the Control line in generation 0 and 16.2 vs 13.7 in generation five. The regression of line mean on generation number was .40 ± .09 for the Select line and -.16 ± .05 for the Control line. Realized heritability was estimated by three methods. Estimates obtained were 52 ± 10% from conventional regression of response on cumulative selection (Method 1), 40 ± 8% when response deviations from controls were weighted by cumulative selection differentials (Method 2) and 45 ± 7% from Fifth generation only (Method 3).

¹ Published with the approval of the Director as Paper No. 3760 Journal Series, Nebraska Agr. Exp. Sta. Research reported was conducted under Project 13–1.

² The authors are indebted and express appreciation to Dr. Lavon Sumption, originally a leader on the project, for establishing the population and for making a major contribution to the experimental design: Mr. Roy Carlson for making most of the critical estrus observations and for the management and care of the pigs throughout the experiment; Dr. E. R. Peo, Jr., for formulating the diets used; Dr. Andy Swiger, for providing valuable advice regarding the statistical design of the experiment; Dr. Leo Lucas, for assisting with the establishment of the lines; Dr. Gordon Dickerson, for valuable suggestions incorporated into the paper; and the numerous herdsmen, technicians, graduate and undergraduate students at UN-L who contributed in many ways to the success of the experiment.

³ Department of Animal Science.

⁴ This research was supported in part by a cooperative agreement with the Agricultural Research Service, U.S.D.A.

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