J. Anim Sci.
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J. Anim Sci. 1968. 27:1602-1606.
© 1968 American Society of Animal Science
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Effect of Feed Intake and Antibiotic on Reproduction in Gilts1

M. E. Ruiz, V. C. Speer, V. W. Hays2 and W. P. Switzer3

Iowa Agriculture and Home Economics Experiment Station, Ames,4

Abstract

A 2 x 2 factorial experiment was conducted to study the effects of two levels of feed intake with and without a combination of antibiotics (penicillin and chlortetracycline) and sulfamethazine on the reproductive performance of gilts. Ninety-six animals were subjected to the treatments starting 1 wk. before and ending 3 wk. after the beginning of breeding.

The antibiotic-treated gilts farrowed significantly more pigs per litter (including pigs born dead) than did the control gilts. More pigs were farrowed alive in the antibiotictreated group than in the control group, although the difference was not statistically significant. No treatment differences due to antibiotics were observed on the weight of pigs farrowed alive, number of pigs weaned or weaning weight. Significant increases in conception at first estrus and farrowing rates were obtained in the antibiotic-treated groups. Significant interactions of the responses to antibiotics and feeding levels were observed in both lactation feed consumption and total feed consumption.

No significant effects due to the level of feed intake were observed in the number or weight of pigs farrowed or weaned. Gilts receiving the high level of feed intake showed no significant difference in weight gain as compared with the low-plane gilts.

Bacteriological studies of the vaginal flora before breeding revealed that treatments did not significantly change the bacterial population of the different microorganisms studied.

Footnotes

1 Journal Paper No. J5897 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1511.

2 Present address: Animal Sciences Department, University of Kentucky, Lexington.

3 Veterinary Medical Research Institute.

4 Department of Animal Science.

5 Aureo S.P. 250 Medicated Premix, American Cyanamid Company, Princeton, New Jersey.






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Copyright © 1968 by the American Society of Animal Science.