Korean Journal of Animal Reproduction (한국가축번식학회지)

The Korean Society of Animal Reproduction (한국동물번식학회)
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Comparison of Estradiol-17$\beta$, Progesterone and litter Size among Primiparous Sow Breeds Weaned after Lactation for 7 or 21 Days

  • Kim, J. S (Livestock Experiment Station, Chungnam Livestock Sanitation Research Institute) ;
  • Kim, H. K. (Livestock Experiment Station, Chungnam Livestock Sanitation Research Institute) ;
  • C. B. Yang (National Livestock Research Institute, RDA) ;
  • D. S. Son (National Livestock Research Institute, RDA) ;
  • Lee, S. H. (College of Visual Image ＆ Health, Kongju National University) ;
  • Y. J. Yi (Division of Animal Science and Resources, Research Center for Transgenic Cloned Pigs, Chungnam National University) ;
  • Park, C. S. (Division of Animal Science and Resources, Research Center for Transgenic Cloned Pigs, Chungnam National University)
  • Published : 2003.12.01
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Abstract

This study was carried out to find out the changes on serum concentrations of estradiol-17$\beta$, progesterone in primiparous Duroc, Landrace and Yorkshire sows weaned at 7 or 21 days. Also, we compared the litter size at birth and weaning among the breeds weaned after lactation for 7 or 21 days. The estradiol-17$\beta$ concentrations among the breeds were 6.9∼8.8 pg/ml and 6.4∼8.8 pg/ml after lactation for 7 or 21 days, respectively. The progesterone concentrations ranged from 0.3 ng/ml to 1.6 ng/ml. Duroc sow showed higher progesterone concentration compared with Landrace and Yorkshire sows weaned after lactation for 7 or 21 days. Also, we found out that litter size at birth and weaning, respectively, did not show any differences between day 7 and day 21 of lactation. From the facts mentioned above, it was suggested that very early weaning systems could work with no apparent adverse effect on prolificacy.

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References

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