J. Anim Sci.
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J. Anim Sci. 1954. 13:949-954.
© 1954 American Society of Animal Science
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Some Effects of Source of Protein and an Antibiotic on Reproductive Performance in Gilts

Stewart H. Fowler and George L. Robertson

Texas Agricultural Experiment Station1

Abstract

LITTER size in swine is largely dependent upon three factors: the number of ova released, the percentage of such ova fertilized, and the percentage of fertilized ova that develop to maturity. Therefore, any increase in ovulation and fertilization rates and decrease in embryonic mortality would result in an increase in number of pigs farrowed. Data presented by Squiers et al. (1950) and Robertson et al. (1951b) indicate that fertilization rates are quite high in swine, probably over 90 percent. Consequently, any noticeable increase in litter size will have to result from increased ovulation rates and decreased embryonic deaths. Accordingly, this experiment was initiated as part of a study designed to test the effects of various nutritional factors on reproductive performance. This phase of the study considered the effects of the various combinations of animal and vegetable protein and presence or absence of an antibiotic on ovulation rates and embryonic mortality.

Footnotes

1 Department of Animal Husbandry, College Station.




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Copyright © 1954 by the American Society of Animal Science.