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KMID : 0900920030270040281
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Korean journal of Animal Reproduction
2003 Volume.27 No. 4 p.281 ~ p.285
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Comparison of Estradiol-17beta, Progesterone and litter Size among Primiparous Sow Breeds Weaned after Lactation for 7 or 21 Days
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Kim J.-S.
Kim H.-K.
Yang C.-B.
Son D.-S.
Lee S.-H.
Yi Y.-J.
Park C.-S.
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Abstract
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This study was carried out to find out the changes on serum concentrations of estradiol-17beta, 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-17beta 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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KEYWORD
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Estradiol-17beta, Progesterone, Litter size, Primiparous sow
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