tailieunhanh - Báo cáo khoa học: " Oestrone Sulphate Measurements for the Prediction of Small or Large Litters in Pigs"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Oestrone Sulphate Measurements for the Prediction of Small or Large Litters in Pigs. | Acta vet. scand. 2002 43 157-164. Oestrone Sulphate Measurements for the Prediction of Small or Large Litters in Pigs By A. H. Gaustad-Aas1 E. Ropstad2 K. Karlberg2 P O. Hofmo1 E. Dahl2 1Norsvin Hamar and 2The Norwegian School of Veterinary Science Oslo Norway. Gaustad-Aas AH Ropstad E Karlberg K Hofmo PO Dahl E Oestrone sulphate measurements for the prediction of small or large litters in pigs. Acta vet. scand. 2002 43 157-164. - Serum from 88 pregnant sows and gilts was sampled 24 and 28 days after their first insemination or mating day. The oestrone sulphate E1S concentration in the samples was assessed with a commercially available radioimmunoassay kit modified for use with swine serum. The first aim was to test whether it was possible to predict litters of total number 10 piglets at term. The second aim was to compare the use of day 24 or day 28 samples or of both in this prediction. Day 24 E1S levels were positively correlated with litter size at term R2 p . E1S levels on day 28 were correlated with the levels on day 24 in the same animals but could not be used for prediction of large or small litters. The odds ratio for a small litter size was p . This means that odds for a litter size 10 piglets decreased by 84 when E1S levels increased by ng ml. sows pregnancy prediction litter size oestrone sulphate. Introduction In the pregnant sow the embryonic units produce oestrone Lunaas et al. 1973 Perry et al. 1973 1976 Gadsby et al. 1980 which is conjugated with sulphate groups within the endometrium Dwyer Robertson 1980 . Its conjugates have been demonstrated from day 17 of pregnancy with increasing concentration until day 28-30 and a subsequent decrease later in pregnancy Robertson et al. 1978 1985 Chew et al. 1979 . The concentration of oestrone and its conjugates in the post-breeding female s plasma serum urine faeces and saliva has been assessed in order to diagnose pregnancy Robertson et al. 1978 Hattersley et al. 1980 Saba .

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