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The Effect of Season of Birth on Sexual Development in Gilts^{1, 2, 3,}

University of Wisconsin

Abstract

The stage of sexual development was investigated in 2,967 market gilts of unknown ages slaughtered at four seasons of the year and in 113 gilts of known age slaughtered in the fall. Highly significant seasonal differences in the percentages of pre-puberal animals were found in the one study with the highest percentage being found in October and the lowest in April. In the other study the percentage of sexually immature animals was significantly higher in the group born early in the spring farrowing season than in the group born late although the latter group was younger at slaughter.

¹ From the Departments of Genetics (Paper No. 421) and Animal Husbandry, College of Agriculture, University of Wisconsin.

² The authors are grateful to Oscar Mayer and Co., Madison, Wisconsin, for their cooperation in making this study possible.

³ The authors acknowledge the assistance of A. C. Warnick, R. M. Durham, G. D. Wilson and A. B. Chapman.