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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)
Publication Information
Korean Journal of Animal Reproduction / v.27, no.4, 2003 , pp. 281-285 More about this Journal
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.
Keywords
Estradiol-17$\beta$; Progesterone; Litter size; Primiparous sow;
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