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Journal of Animal Science, Vol 77, Issue 6 1532-1535, Copyright © 1999 by American Society of Animal Science

JOURNAL ARTICLE

Failure of vitamin A to increase litter size in sows receiving injections at various stages of gestation

A. E. Pusateri, M. A. Diekman and W. L. Singleton
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907-1151, USA.

To determine the effectiveness of a single injection of vitamin A to increase litter size, 1,375 sows were assigned randomly to 11 treatment groups (125 sows per treatment). Treatments included injection of 1 x 10(6) IU of vitamin A dissolved in corn oil at weaning or on d 0, 2, 6, 10, 13, 19, 30, 70, or 110 after breeding. Sows in the control group were injected with corn oil on corresponding days. A total of 396 sows were removed from the study following treatment or treatment assignment. Therefore, farrowing data were collected for 979 sows. Injection of vitamin A did not influence (P > . 10) total litter size, live litter size, litter weight, pig weight, number of runts, or number of mummies. Mean live litter size was 10.1 +/- .1 for all sows that farrowed in the experiment. Parity group affected total litter size, live litter size, live litter weight, and number stillborn (P < .01) but not pig weight, number of runts, number of mummies, or gestation length (P > . 10). In this study, a single injection of vitamin A at any time from weaning to farrowing did not increase litter size in sows.


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M. D. Lindemann, J. H. Brendemuhl, L. I. Chiba, C. S. Darroch, C. R. Dove, M. J. Estienne, and A. F. Harper
A regional evaluation of injections of high levels of vitamin A on reproductive performance of sows
J Anim Sci, February 1, 2008; 86(2): 333 - 338.
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