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Karyotypes and Morphological and Histological Alterations of the Genital Tracts of Repeat Breeder Heifers with Known Breeding History

Karyotyper och morfologiska och histologiska förändringar i könsorganen hos omlöparkvigor med känt antal inseminationer och inseminationsintervall

Acta Veterinaria Scandinavica volume 26, pages 1–12 (1985)Cite this article

Abstract

Forty-two repeat breeder heifers (RBH) and 27 virgin heifers (VH) were used in the study. The breeding history and the occurrence of chromosomal aberrations were investigated in the RBH. The genital tracts of the RBH and the VH were investigated at slaughter 3 to 35 days after artificial insemination and/or embryo transfer for the presence of morphological and histological changes. According to AI data the mean number of inseminations per RBH in the herd of origin was 4.9 and 110 interservice intervals out of 141 calculated were normal (17–24 days) or twice normal (34–48 days). Two RBH out of 28 investigated demonstrated the 1/29 translocation. The post mortem examination revealed corpus lutea and follicles normal for the stage of the cycle in all animals. In three RBH abnormalities of the uterus or cervix were found. A higher incidence of cystic glands and of focal accumulation of erythrocytes and lymphocytes in the endometrium was found in the RBH than in the VH (P ≤ 0.05). The relation between the embryonic survival and the histological alterations of the uterus was not significant.

It is suggested that errors in heat detection, abnormal karyotypes and morphological defects of the genital tract play a minor role in the repeat breeding complex in heifers.

Sammanfattning

Kvigor utslagna från besättningar på grund av symtomlös omlöpning (42 st) och förut ej inseminerade kvigor undersöktes enligt följande. Omlöparkvigornas inseminationer och inseminationsintervall i ursprungsbesättningarna beräknades från AI data. Omlöparnas karyotyper bestämdes. Könsorganen från båda kvigkategorierna undersöktes vid slakt, 3–35 dagar efter insemination och embryo transfer, avseende morfologiska och histologiska förändringar.

Omlöparna befanns vara inseminerade i genomsnitt 4.9 gånger med till största delen (ca 80 %) normala eller dubbelt normala Intervall. Två av 28 undersökta omlöpare var heterozygota för 1/29 translokation. Alla kvigor hade gula kroppar och folliklar i ovarierna som väl överensstämde med cyclusstadiet vid slakt. Hos tre omlöpare sågs anatomiska förändringar i livmoder och livmoderhals. Gystiskt dilaterade körtlar och fokala ansamlingar av erytrocyter och lymfocyter i endometriet sågs hos en högre andel av omlöparna än hos de förut oinseminerade kvigorna (P ≤ 0.05). Ingen signifikant relation sågs mellan förekomsten av normala embryon i livmodern och dessa förändringar.

Undersökningen ger vid handen att dålig brunstpassning, felaktiga kromosomuppsättningar och morfologiska förändringar i könsorganen sannolikt spelat en mindre roll för uppkomsten av symtomlös omlöpning i detta material.

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Authors and Affiliations

  1. Department of Obstetrics and Gynaecology and Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, S-750 07, Uppsala, Sweden

    H. Gustafsson, K. Larsson & I. Gustavsson

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  1. H. Gustafsson
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  2. K. Larsson
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  3. I. Gustavsson
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Gustafsson, H., Larsson, K. & Gustavsson, I. Karyotypes and Morphological and Histological Alterations of the Genital Tracts of Repeat Breeder Heifers with Known Breeding History. Acta Vet Scand 26, 1–12 (1985). https://doi.org/10.1186/BF03546559

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Acta Veterinaria Scandinavica

ISSN: 1751-0147