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An Epidemiological and Genetic Study on Registered Diseases in Finnish Ayrshire Cattle

En epidemiologisk och genetisk undersökning av sjukdomsdata från finsk Ayrshire boskap. I. Dataset, sjukdomsfrekvens och slakt

I. The Data, Disease Occurrence and Culling

Acta Veterinaria Scandinavica volume 27, pages 182–195 (1986)Cite this article

Abstract

The epidemiology and genetic variability of the most common dairy cow diseases were examined. This paper describes the data set, lactation incidence rates and culling during lactation. The data set consisted of the lactation records of 73,368 Finnish Ayrshire dairy cows. Each cow was under observation for 2 days before and 305 days after calving. Lactational incidence rates (%) for the most common diseases were: ovulatory dysfunction 7.0, ketosis 6.0, acute mastitis 5.4, an oestrus and suboestrus 5.2, retained placenta 4.5, parturient paresis 3.8 and teat injury 2.6. Multiple logistic regression was utilized to investigate the possible effects of certain factors on culling. The model predicted the log odds for culling as an additive function of the explanatory factors. Using the estimated odds and forming the odds ratios it was possible to investigate, relative risks between any combination of groups of the explanatory factors. The risk of culling increased with parity after the second parturition, and with increasing herd milk yield. Mastitis and parturient paresis had positive associations with culling, while ketosis and infertility had negative associations. Heritability estimates for culling in various parity groups were from 2 % to 9 % on the binomial scale corresponding from 5 % to 14 % on the normal scale. There was a neagtive genetic correlation between culling and previous milk production.

Sammendrag

Den epidemiologiska och genetiska variationen av de mest allmänna mjölkboskapssjukdomarna har undersökts. I denna publikation beskrevs dataset, lactation incidence rate (LIR) och orsak till slakt. Materialet innehåller laktationsresultat från 73368 finska Ayrshire kor. Varje ko observerades från 2 dagar före till 305 dagar efter kalvningen. LIR (%) för de mest allmänna sjukdomarna var ovulationstörningar 7.0, ketos 6.0, akut mastit 5.4, brunsitsvaghet 5.2, kvarbliven efterhörd 5.5, paresis puerperalis 3.8 och spensjukdomar 2.6. Inverkan av möjliga faktorer på slakt undersöktes med multipel logitisk regression. Modellen prognostiserar log odds för slakt som additiv funktion av de förklarande faktorerna. Odds ratio beräknades av estimerade odds för att undersöka relaterande risken mellan olika kombinationer av förklarande faktorer. Slaktrisken ökar med ökat antal laktationsperioder efter den andra laktationen och med ökande besättningsmedelproduktion. Mastit och pares har ett positivt samband med slakt, medan ketos och infertilitet har ett negativt samband. Ärftligheten för slaktrisken i olika laktationsperioider var från 2 % till 9 % i den binomiala skalan motsvarande från 5 % till 14 % i den normala skalan. Genetisk korrelation mellan slakt och tidigare mjölkproduktion var negativ.

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Acknowledgments

The authors thank Pol. Lie. Juni Palmgren for advice on logistic regression, and the Agricultural Data Processing Centre for supplying computer facilities for statistical analysis.

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Authors and Affiliations

  1. Department of Animal Hygiene, College of Veterinary Medicine, Helsinki, Finland

    Yrjö Gröhn, Hanau Saloniemi & Jouko Syväjärvi

  2. the Finnish Animal Breeding Association, Vantaa, Finland

    Yrjö Gröhn, Hanau Saloniemi & Jouko Syväjärvi

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  1. Yrjö Gröhn
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  2. Hanau Saloniemi
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  3. Jouko Syväjärvi
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Gröhn, Y., Saloniemi, H. & Syväjärvi, J. An Epidemiological and Genetic Study on Registered Diseases in Finnish Ayrshire Cattle. Acta Vet Scand 27, 182–195 (1986). https://doi.org/10.1186/BF03548163

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Acta Veterinaria Scandinavica

ISSN: 1751-0147