Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms
Objective The objective of this study was to evaluate the genetic behavior of a population of Holstein cattle in response to the variation of environmental temperature by analyzing the effects of genotype by environment interaction (GEI) through reaction norms for the somatic cell score (SCS). Metho...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Asian-Australasian Association of Animal Production Societies
2021-04-01
|
| Series: | Animal Bioscience |
| Subjects: | |
| Online Access: | http://www.animbiosci.org/upload/pdf/ajas-20-0031.pdf |
| _version_ | 1818622830794768384 |
|---|---|
| author | Henrique Alberto Mulim Luis Fernando Batista Pinto Altair Antônio Valloto Victor Breno Pedrosa |
| author_facet | Henrique Alberto Mulim Luis Fernando Batista Pinto Altair Antônio Valloto Victor Breno Pedrosa |
| author_sort | Henrique Alberto Mulim |
| collection | DOAJ |
| description | Objective The objective of this study was to evaluate the genetic behavior of a population of Holstein cattle in response to the variation of environmental temperature by analyzing the effects of genotype by environment interaction (GEI) through reaction norms for the somatic cell score (SCS). Methods Data was collected for 67,206 primiparous cows from the database of the Paraná Holstein Breeders Association in Brazil, with the aim of evaluating the temperature effect, considered as an environmental variable, distinguished under six gradients, with the variation range found being 17°C to 19.5°C, over the region. A reaction norm model was adopted utilizing the fourth order under the Legendre polynomials, using the mixed models of analysis by the restricted maximum likelihood method by the WOMBAT software. Additionally, the genetic behavior of the 15 most representative bulls was assessed, in response to the changes in the temperature gradient. Results A mean score of 2.66 and a heritability variation from 0.17 to 0.23 was found in the regional temperature increase. The correlation between the environmental gradients proved to be higher than 0.80. Distinctive genetic behaviors were observed according to the increase in regional temperature, with an observed increase of up to 0.258 in the breeding values of some animals, as well as a reduction in the breeding of up to 0.793, with occasional reclassifications being observed as the temperature increased. Conclusion Non-relevant GEI for SCS were observed in Holstein cattle herds of southern Brazil. Thus, the inclusion of the temperature effect in the model of genetic evaluation of SCS for the southern Brazilian Holstein breed is not required. |
| first_indexed | 2024-12-16T18:31:24Z |
| format | Article |
| id | doaj.art-a552bb837cdb429ca0c0bb00d9f6ea54 |
| institution | Directory Open Access Journal |
| issn | 2765-0189 2765-0235 |
| language | English |
| last_indexed | 2024-12-16T18:31:24Z |
| publishDate | 2021-04-01 |
| publisher | Asian-Australasian Association of Animal Production Societies |
| record_format | Article |
| series | Animal Bioscience |
| spelling | doaj.art-a552bb837cdb429ca0c0bb00d9f6ea542022-12-21T22:21:17ZengAsian-Australasian Association of Animal Production SocietiesAnimal Bioscience2765-01892765-02352021-04-0134449950510.5713/ajas.20.003124520Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction normsHenrique Alberto Mulim0Luis Fernando Batista Pinto1Altair Antônio Valloto2Victor Breno Pedrosa3 Department of Animal Science, State University of Ponta Grossa, Ponta Grossa, PR, 84030-900, Brazil Department of Animal Science, Federal University of Bahia, Salvador, BA, 40170-115, Brazil Paraná Holstein Breeders Association, APCBRH, Curitiba, PR, 81200-404, Brazil Department of Animal Science, State University of Ponta Grossa, Ponta Grossa, PR, 84030-900, BrazilObjective The objective of this study was to evaluate the genetic behavior of a population of Holstein cattle in response to the variation of environmental temperature by analyzing the effects of genotype by environment interaction (GEI) through reaction norms for the somatic cell score (SCS). Methods Data was collected for 67,206 primiparous cows from the database of the Paraná Holstein Breeders Association in Brazil, with the aim of evaluating the temperature effect, considered as an environmental variable, distinguished under six gradients, with the variation range found being 17°C to 19.5°C, over the region. A reaction norm model was adopted utilizing the fourth order under the Legendre polynomials, using the mixed models of analysis by the restricted maximum likelihood method by the WOMBAT software. Additionally, the genetic behavior of the 15 most representative bulls was assessed, in response to the changes in the temperature gradient. Results A mean score of 2.66 and a heritability variation from 0.17 to 0.23 was found in the regional temperature increase. The correlation between the environmental gradients proved to be higher than 0.80. Distinctive genetic behaviors were observed according to the increase in regional temperature, with an observed increase of up to 0.258 in the breeding values of some animals, as well as a reduction in the breeding of up to 0.793, with occasional reclassifications being observed as the temperature increased. Conclusion Non-relevant GEI for SCS were observed in Holstein cattle herds of southern Brazil. Thus, the inclusion of the temperature effect in the model of genetic evaluation of SCS for the southern Brazilian Holstein breed is not required.http://www.animbiosci.org/upload/pdf/ajas-20-0031.pdfdairy cattleenvironmental effectsgenetic evaluationmastitissomatic cell count |
| spellingShingle | Henrique Alberto Mulim Luis Fernando Batista Pinto Altair Antônio Valloto Victor Breno Pedrosa Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms Animal Bioscience dairy cattle environmental effects genetic evaluation mastitis somatic cell count |
| title | Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms |
| title_full | Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms |
| title_fullStr | Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms |
| title_full_unstemmed | Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms |
| title_short | Genotype by environment interaction for somatic cell score in Holstein cattle of southern Brazil via reaction norms |
| title_sort | genotype by environment interaction for somatic cell score in holstein cattle of southern brazil via reaction norms |
| topic | dairy cattle environmental effects genetic evaluation mastitis somatic cell count |
| url | http://www.animbiosci.org/upload/pdf/ajas-20-0031.pdf |
| work_keys_str_mv | AT henriquealbertomulim genotypebyenvironmentinteractionforsomaticcellscoreinholsteincattleofsouthernbrazilviareactionnorms AT luisfernandobatistapinto genotypebyenvironmentinteractionforsomaticcellscoreinholsteincattleofsouthernbrazilviareactionnorms AT altairantoniovalloto genotypebyenvironmentinteractionforsomaticcellscoreinholsteincattleofsouthernbrazilviareactionnorms AT victorbrenopedrosa genotypebyenvironmentinteractionforsomaticcellscoreinholsteincattleofsouthernbrazilviareactionnorms |