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A Study on Primiparous Sows of the Ability to Show Standing Oestrus and to Ovulate after Weaning. Influences of Loss of Body Weight and Backfat during Lactation and of Litter Size, Litter Weight Gain and Season

En studie av ungsuggornas förmåga att visa brunst och ovulera efter avvänjningen. Påverkan av vikt- och fettförluster under diperioden, kullstorlek, kulltillväxt samt årstid

Acta Veterinaria Scandinavica volume 31, pages 227–236 (1990)Cite this article

Abstract

The ability to show standing oestrus and to ovulate within 10 days of weaning was studied in 240 purebred Swedish Yorkshire primiparous sows, fed according to a conventional feeding regime during lactation. The sows were weighed and backfat depth was recorded at farrowing and at weaning. Oestrus control was performed daily and blood samples for determination of plasma progesterone were drawn regularly in 205 sows.

The distribution among the sows of the first standing oestrus after weaning had 2 peaks. The first peak occurred within 10 days of weaning and the second 24–30 days after weaning.

Twelve per cent of the sows ovulated without showing standing oestrus within 10 days of weaning and 4 % had an anovulatory first oestrus within the same time. Significant differences in age at farrowing and in loss of weight and backfat during lactation were found between sows which both showed standing oestrus and ovulated within 10 days of weaning and sows which neither showed standing oestrus, nor ovulated within the same time. The season during which weaning occurred significantly influenced the ability to show standing oestrus and ovulate within 10 days of weaning.

Among the sows which both showed standing oestrus and ovulated within 10 days of weaning, significant positive correlations were found between weight loss, litter size, litter weight gain and the interval from weaning to first standing oestrus.

Sammanfattning

Förmågan att visa brunst och ovulera inom 10 dagar efter avvänjningen studerades hos 240 ungsuggor, alla utfodrade efter samma norm under diperioden. Suggorna vägdes och sidspäckets tjocklek mättes vid grisning och avvänjning. Brunstkontroll utfördes dagligen och blodprover för bestämning av plasma-progesteron togs regelbundet på 205 av suggorna.

Fördelningen av antal dagar till första brunst efter avvänjningen hade två toppar, den första inom 10 dagar och den andra 24–30 dagar efter avvänjningen.

Tolv procent av suggorna ovulerade inom 10 dagar efter avvänjningen utan att visa brunst medan 4 procent hade en anovulatorisk förstå brunst. Signifikanta skillnader i grisningsålder, vikt- och fettförluster under diperioden påvisades mellan de suggor som både visade brunst och ovulerade inom 10 dagar efter avvänjningen och de som varken visade brunst eller ovulerade inom samma tid. Årstiden vid avvänjningen visade sig ha ett signifikant inflytande på formågan att visa brunst och ovulera inom 10 dagar efter avvänjningen.

Hos de suggor som både visade brunst och ovulerade inom 10 dagar efter avvänjningen sågs signifikant positiva korrelationer mellan viktförlust under diperioden, kullstorlek, kulltillväxt och intervallet mellan avvänjningen och första brunst.

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Authors and Affiliations

  1. Department of Obstetrics and Gynaecology, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, P. O. Box 7039, S-750 07, Uppsala, Sweden

    Marie Sterning, Lotta Rydhmer, Lena Eliasson, Stig Einarsson & Kjell Andersson

  2. Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, P. O. Box 7039, S-750 07, Uppsala, Sweden

    Marie Sterning, Lotta Rydhmer, Lena Eliasson, Stig Einarsson & Kjell Andersson

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  1. Marie Sterning
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  2. Lotta Rydhmer
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  3. Lena Eliasson
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  4. Stig Einarsson
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  5. Kjell Andersson
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Sterning, M., Rydhmer, L., Eliasson, L. et al. A Study on Primiparous Sows of the Ability to Show Standing Oestrus and to Ovulate after Weaning. Influences of Loss of Body Weight and Backfat during Lactation and of Litter Size, Litter Weight Gain and Season. Acta Vet Scand 31, 227–236 (1990). https://doi.org/10.1186/BF03547566

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Acta Veterinaria Scandinavica

ISSN: 1751-0147