Sows that fail to become pregnant show luteal regression at day 13 after mating.

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliAmmatillinen

Abstrakti

Introduction: In mated sows, corpus luteum (CL) function is important for the establishment of the pregnancy. The maximum CL size is established at day 8- 9 of the pregnancy and maintained autonomous until day 12. Then, CL maintenance will depend on hormones such as LH and PGF2α. PGF2α is releasedfrom the endometrium at day 14 and triggers CL regression. This regression can be prevented in pregnant sows due to estradiol production from theattaching conceptuses; which decreases endocrine PGF2α release.We hypothesized that a negative CL development between day 12 and 13 has a negative effect on the pregnancy rate in mated sows and on litter size inpregnant sows.Materials and Methods: We performed a transrectal ultrasound examination (10 MHz, linear array probe, SV3513, Esaote SpA, Italy) of both ovaries andtheir CLs at day 10 (CLarea10) and 13 (CLarea13) after ovulation in 46 mated crossbred sows (Finnish Yorkshire x Finnish Landrace). The ultrasoundimages were analyzed on the computer using IMPAX 6.5.5 picture archiving and communication system (Agfa Healthcare, Belgium). We measured of eachovary the size (area in cm2) of the five biggest CLs and averaged them. Furthermore, we calculated the difference of the average CL area between day 10and 13 (CLarea13-10). Pregnancy detection was performed two weeks later and the numbers of alive, still born, and total born piglets were determined atsubsequent parturition. We analyzed average CL area per pregnancy status using an independent two sample t-test and relations with litter size using alinear regression model (PASW Statistics v. 18.0.0).Results: The parity was 3.8 ± 1 (mean ± SD), CLarea10 0.63 ± 0.11 cm2, CLarea13 0.65 ± 0.13 cm2, and CLarea13-10 0.02 ± 0.12 cm2. At 4 weeks afterinsemination, 40 sows were detected pregnant (PREG) and 6 not pregnant (NONPREG). Pregnancy status at 4 weeks was not related with CLarea10(PREG 0.62 ± 0.12 cm2 vs. NONPREG 0.69 ± 0.07 cm2), but was related with CLarea13 (PREG 0.66 ± 0.11 cm2 vs. NONPREG 0.55 ± 0.18 cm2; P =0.046) and CL13-10 (PREG 0.05 ± 0.08 cm2 vs. NONPREG -0.15 ± 0.16 cm2; P < 0.001).No correlations were found between CLarea10, CLarea13, andCLarea13-10 and the number of total, alive, and still born piglets at subsequent farrowing.Conclusion: The results indicate that there is no difference in the development of the corpus luteum between pregnant and not pregnant sows during theautonomous period. After that period, when the destination of the corpus luteum (CL) starts to be dependent on hormonal interactions, CLs of mated nonpregnantsows
Alkuperäiskielienglanti
OtsikkoSows that fail to become pregnant show luteal regression at day 13 after mating.
Sivumäärä1
Vuosikerta2016
JulkaisupaikkaDublin
Sivut118
TilaValmisteltavana - 7 kesäkuuta 2016
OKM-julkaisutyyppiD3 Artikkeli ammatillisessa konferenssijulkaisussa
TapahtumaInternational Pig Veterinary Society Congress - Dublin, Irlanti
Kesto: 7 kesäkuuta 201610 kesäkuuta 2017
Konferenssinumero: 24

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Proceeding volume: 2016

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