Impact of inbreeding and genetic parameter estimates for seminal traits in Lusitano horses.

Autor: Gonçalves AR; MED Mediterranean Institute for Agriculture, Environment and Development & CHANGE - Global Change and Sustainability Institute, Institute for Advanced Studies and Research, Universidade de Évora, Pólo da Mitra, Ap. 94, 7006-554, Évora, Portugal., Telo da Gama L; CIISA - Centre for Interdisciplinary Research in Animal Health, Faculty of Veterinary Medicine, University of Lisbon, Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS). Universidade de Lisboa, 1300-477, Lisbon, Portugal; Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477, Lisbon, Portugal. Electronic address: ltgama@fmv.ulisboa.pt., Antunes L; Multivet, Serviços veterinários de Equinos e espécies pecuárias, Lda. Rua Professor Alfredo Reis n.º51, 7005-585, Évora, Portugal., Guimarães H; MED Mediterranean Institute for Agriculture, Environment and Development & CHANGE - Global Change and Sustainability Institute, Institute for Advanced Studies and Research, Universidade de Évora, Pólo da Mitra, Ap. 94, 7006-554, Évora, Portugal., Bliebernicht M; Embriovet, Rua Fonte Costa, Salvaterra de Magos, Portugal., Duarte JC; LusoPecus, Rua da Fábrica 58C, 2135-144, Samora Correia, Portugal., Cosinha C; LusoPecus, Rua da Fábrica 58C, 2135-144, Samora Correia, Portugal., Duarte Rego B; Genequino, Rua Jaime Brasil, 7 1500-351, Lisboa, Portugal., Ferro da Costa P; Genequino, Rua Jaime Brasil, 7 1500-351, Lisboa, Portugal., Guimarães T; Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477, Lisbon, Portugal; ICBAS, Laboratório Associado Universidade do Porto, Porto, Portugal., Rocha A; Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477, Lisbon, Portugal; ICBAS, Laboratório Associado Universidade do Porto, Porto, Portugal., Bettencourt E; MED Mediterranean Institute for Agriculture, Environment and Development & CHANGE - Global Change and Sustainability Institute, Departamento de Medicina Veterinária, Escola de Ciências e Tecnologia, Universidade de Évora, Pólo da Mitra, Ap. 94, 7006-554, Évora, Portugal.
Jazyk: angličtina
Zdroj: Theriogenology [Theriogenology] 2023 Sep 15; Vol. 208, pp. 43-51. Date of Electronic Publication: 2023 May 27.
DOI: 10.1016/j.theriogenology.2023.05.011
Abstrakt: The objectives of this study were to establish baseline information for seminal traits in Lusitano stallions, to assess the impact of inbreeding, interval between collections and age on semen quality during the breeding and non-breeding seasons, and to estimate the corresponding genetic parameters. A total of 2129 ejaculates by 146 Lusitano stallions used for artificial insemination, obtained from four equine reproduction centers distributed throughout Portugal, over a period of 14 years (2008-2021), were included in the study. The seminal traits analyzed, and the corresponding means and standard deviations, were gel-free volume (56.95 ± 28.76 mL), concentration (186.48 ± 104.68 × 10 6 ), motility (64.1 ± 16.9%), total number of spermatozoa (TNS) (9.271 ± 4.956 × 10 9 ) and total number of motile spermatozoa per ejaculate (TNMS) (5.897 ± 3.587 × 10 9 ). These results are in the normal range of values described for other breeds. In the stallions analyzed, the mean value for the inbreeding coefficient was 7.93 ± 5.29%, and for age it was 12.70 ± 6.83 years. A significant decline in sperm concentration, motility, TNS, and TNMS was observed as inbreeding increased. The season also influenced sperm concentration, motility, TNS and TNMS, with the highest values observed during the breeding season. When considering the impact of age on Lusitano seminal parameters, results showed a nonlinear relationship, with a positive effect until 18 years of age for volume, motility, TNS and TNMS and a negative effect after this age, with a slow decrease. However, age had a markedly negative effect on sperm concentration. The interval between semen collections only affected (P < 0.05) sperm motility, with a regression coefficient of +1.89 ± 2.17% per additional day. Genetic parameters were estimated with an Animal Model, and the estimated heritability (repeatability) was 0.27 (0.35) for volume, 0.02 (0.38) for sperm concentration, 0.24 (0.44) for motility, 0.29 (0.39) for TNS and 0.41 (0.41) for TNMS. These results suggest that it is possible to improve semen quality by selection and that the properties of semen produced by a stallion tend to remain consistent throughout its lifetime. Furthermore, the impact of inbreeding should be taken into consideration when selecting Lusitano stallions for fertility.
Competing Interests: Declaration of competing interest The authors declare that they have no conflict of interest.
(Copyright © 2023. Published by Elsevier Inc.)
Databáze: MEDLINE
Externí odkaz: