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Time of Farrow and Performance in Spring Farrowed Pigs¹

University of Wisconsin

Abstract

The association of time of farrow and pig performance is of interest to both hog producers and packing companies. An analysis of records from 445 Wisconsin farms for the years 1947 to 1950 provides information on this problem in spring farrowed litters.

The differences in performance of pigs farrowed in the early, middle, and late spring groups, with regard to such characters as litter size, viability, and weight for age, were found to be small and not consistent from year to year. Such differences as were found tended to cancel over all years. The same general conclusions held whether the data were classified grossly or on an intra-herd basis. The need for controlled experimentation on this phase of swine production and for data on the ratio of income to cost was stressed.

¹ Paper No. 521 from the Department of Genetics and the Department of Animal Husbandry. Published with the approval of the Director of the Agricultural Experiment Station. This work was supported in part by a grant from Oscar Mayer and Company, Madison, Wisconsin.