Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany

Abstract Background The Black Forest Draught horse (BFDH) is an endangered German coldblood breed with its origin in the area of the Black Forest in South Germany. In this retrospective study, the influence of the inbreeding coefficient on foaling rates was investigated using records from ten breedi...

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Main Authors: Maarit Müller-Unterberg, Sandra Wallmann, Ottmar Distl
Format: Article
Language:English
Published: BMC 2017-10-01
Series:Acta Veterinaria Scandinavica
Subjects:
Online Access:http://link.springer.com/article/10.1186/s13028-017-0338-4
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spelling doaj-ab7a150bd6a742139f14593470fb26be2020-11-25T00:35:54ZengBMCActa Veterinaria Scandinavica1751-01472017-10-015911610.1186/s13028-017-0338-4Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in GermanyMaarit Müller-Unterberg0Sandra Wallmann1Ottmar Distl2Institute for Animal Breeding and Genetics, University of Veterinary Medicine Hannover (Foundation)Institute for Animal Breeding and Genetics, University of Veterinary Medicine Hannover (Foundation)Institute for Animal Breeding and Genetics, University of Veterinary Medicine Hannover (Foundation)Abstract Background The Black Forest Draught horse (BFDH) is an endangered German coldblood breed with its origin in the area of the Black Forest in South Germany. In this retrospective study, the influence of the inbreeding coefficient on foaling rates was investigated using records from ten breeding seasons. Due to the small population size of BFDH, the level of inbreeding is increasing and may have an effect on foaling rates.The data of the present study included all coverings reported for 1024 BFDH mares in the years 2001–2009. These mares were covered by 32 BFDH stallions from the State Stud Marbach. Data from 4534 estrus cycles was used to calculate per cycle foaling rate (CFR). Pedigree data contained all studbook data up to the foundation of the breed as early as 1836. The level of inbreeding of the mare, stallion and expected foal along with other systematic effects on CFR were analysed using a generalized linear mixed model approach. Stallion was employed as a random effect. Systematic fixed effects were month of mating, mating type, age of the mare and stallion, reproductive status of the mare and stallion line of the mare. Inbreeding coefficients of the stallion, mare and expected foal were modelled as linear covariates. Results The average CFR was 40.9%. The mean inbreeding coefficients of the mares, stallions and expected foals were 7.46, 7.70 and 9.66%. Mating type, age of the mare, reproductive status of the mare and stallion line of the mare had a significant effect. Conclusions The results showed that the mating type, stallion line of the mare, sire, age and reproductive status of the mare exerted the largest influences on CFR in BFDH. Inbreeding coefficients of the stallion, mare and expected foal were not significantly related with CFR.http://link.springer.com/article/10.1186/s13028-017-0338-4Black Forest Draught horseFertilityFoaling rateHorseInbreeding
collection DOAJ
language English
format Article
sources DOAJ
author Maarit Müller-Unterberg
Sandra Wallmann
Ottmar Distl
spellingShingle Maarit Müller-Unterberg
Sandra Wallmann
Ottmar Distl
Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany
Acta Veterinaria Scandinavica
Black Forest Draught horse
Fertility
Foaling rate
Horse
Inbreeding
author_facet Maarit Müller-Unterberg
Sandra Wallmann
Ottmar Distl
author_sort Maarit Müller-Unterberg
title Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany
title_short Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany
title_full Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany
title_fullStr Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany
title_full_unstemmed Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany
title_sort effects of inbreeding and other systematic effects on fertility of black forest draught horses in germany
publisher BMC
series Acta Veterinaria Scandinavica
issn 1751-0147
publishDate 2017-10-01
description Abstract Background The Black Forest Draught horse (BFDH) is an endangered German coldblood breed with its origin in the area of the Black Forest in South Germany. In this retrospective study, the influence of the inbreeding coefficient on foaling rates was investigated using records from ten breeding seasons. Due to the small population size of BFDH, the level of inbreeding is increasing and may have an effect on foaling rates.The data of the present study included all coverings reported for 1024 BFDH mares in the years 2001–2009. These mares were covered by 32 BFDH stallions from the State Stud Marbach. Data from 4534 estrus cycles was used to calculate per cycle foaling rate (CFR). Pedigree data contained all studbook data up to the foundation of the breed as early as 1836. The level of inbreeding of the mare, stallion and expected foal along with other systematic effects on CFR were analysed using a generalized linear mixed model approach. Stallion was employed as a random effect. Systematic fixed effects were month of mating, mating type, age of the mare and stallion, reproductive status of the mare and stallion line of the mare. Inbreeding coefficients of the stallion, mare and expected foal were modelled as linear covariates. Results The average CFR was 40.9%. The mean inbreeding coefficients of the mares, stallions and expected foals were 7.46, 7.70 and 9.66%. Mating type, age of the mare, reproductive status of the mare and stallion line of the mare had a significant effect. Conclusions The results showed that the mating type, stallion line of the mare, sire, age and reproductive status of the mare exerted the largest influences on CFR in BFDH. Inbreeding coefficients of the stallion, mare and expected foal were not significantly related with CFR.
topic Black Forest Draught horse
Fertility
Foaling rate
Horse
Inbreeding
url http://link.springer.com/article/10.1186/s13028-017-0338-4
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