Factors influencing conception rates of Arab mares in Tunisia |
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| Authors: | Haifa Benhajali Marie-Annick Richard-Yris Mohammed Ezzaouia Faouzia Charfi Martine Hausberger |
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| Institution: | 1. Université de Rennes I, «Ethologie animale et humaine», UMR CNRS 6552, Campus de Beaulieu, 263 av. Général Leclerc, 35042 Rennes Cedex, France;2. Haras national de Sidi Thabet 2020, Tunisia;3. Université Tunis-ElManar, «Unité de biologie animale et de systématique évolutive», Campus universitaire, 2060 Tunis, Tunisia;1. Master of Reproduction Sciences, Veterinary Institute, University of Tiaret, 14000 Algeria;2. Biology of Reproduction, Veterinary Institute, University of Tiaret, 14000 Algeria;3. Professor of Agronomic Sciences, Mostaganem University, Algeria;4. Reproduction Manager of the National Haras of Chaouchaoua Tiaret, Algeria;1. Department of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;2. Department of Urology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;3. Department of Molecular and Cellular Biology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;4. Department of Pathology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;5. Department of Human Genetics, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;6. Magee-Womens Hospital, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania;1. Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences, University of Trás-os-Montes e Alto Douro (UTAD), Vila Real, Portugal;2. Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes e Alto Douro (IBB/CGB-UTAD), Vila Real, Portugal;3. Department of Surgery and Animal Medicine, Facultad de Veterinaria Universidad Complutense de Madrid, Madrid, Spain;4. Department of Veterinary Medicine, Surgery and Anatomy, University of Léon, Léon, Spain;5. Department of Polymer Engineering, ICVS/3B''s Research Group – Biomaterials, Biodegradables and Biomimetics, University of Minho, Guimarães, Portugal;1. National Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Center for Biocatalytic Technology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Veterinary Medicine, Universidade Estadual de Maringá – UEM, Brazil;2. Department of Biochemistry, Universidade Estadual de Maringá – UEM, Brazil;1. Department of Veterinary Science, University of Messina, Polo Universitario dell’Annunziata, Messina, Italy;2. Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy |
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| Abstract: | In order to investigate the factors affecting the reproduction efficiency of Arab breeding mares in Tunisia, breeding data corresponding to 2340 mated cycles, over 5 years (from 2000 to 2004), from 555 mares offspring of 50 sires and bred with 17 stallions were analysed using a multivariate logistic regression. We chose logit link function and binomial distribution and we used log-likelihood-ratio (LL) and Wald tests (X2 Wald) to test the mean values. The factors of variation included in the model were the year, the stallion, the age of the mare at mating, the sire and the category of the mare. Logistic regression results showed that age and sire affected both the overall conception rate and the first-cycle conception rate of the mares whilst category and stallion influenced only the overall conception rate. To our knowledge, this is the first study showing that the sire of the mare can affect both the first-cycle conception rate and the overall conception rate of the mares. |
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