Publication
Estimation of genetic parameters for dairy ewes using random regression animal model
| Summary: | The objective of the study was to compare different models in the estimation of genetic parameters for test-day milk records in Churra da Terra Quente (CTQ) ewes. Data comprising 10700 test-day measurements from the first lactation of 3096 ewes were used in analysis of morning milk yield (MMY), afternoon milk yield (AMY), and daily milk yield (DMY). Records before 30 and after 150 days in milk were discharged. Average milk yield was 217.1 g. 198.3 g. and 415.4 g for MMY, AMY, and DMY, respectively. Pedigree le contained 5494 animals. Simple fixed regression animal model (FRM) and random regression animal models (RRM), where ortogonal Legendre polynomials of order 3 were used. The REML method as implemented in the VCE-5 programme was applied for estimation of (co)variance components. Statistical models contained linear regression on days in milk and number of lambs born as fixed effects, while Jock-test-day, permanent environment of a ewe, and direct additive genetic effect were treated as random. Estimates of heritability from FRM were low, from 1.9% fat AMY to 8.2% for AJMY. Heritability estimates from RRM presented a maximum at 60 days of lactation (>- 33.9%) and decreased to values lower than 2.5% at the end of lactation. There is a potential for using random regression to model additive genetic and permanent environmental effects for genetic evaluation in CTQ ewes, especially from the first two thirds of lactation when decision on mating has to be taken. |
|---|---|
| Main Authors: | Cadavez, Vasco |
| Other Authors: | Silva, Amélia; Malovrh, Špela; Kovac, Milena |
| Year: | 2011 |
| Country: | Portugal |
| Document type: | conference output |
| Access type: | open access |
| Associated institution: | Instituto Politécnico de Bragança |
| Language: | English |
| Origin: | Biblioteca Digital do IPB |
| _version_ | 1867172929107656704 |
|---|---|
| author | Cadavez, Vasco |
| author2 | Silva, Amélia Malovrh, Špela Kovac, Milena |
| author2_role | author author author |
| author_facet | Cadavez, Vasco Silva, Amélia Malovrh, Špela Kovac, Milena |
| author_role | author |
| contributor_name_str_mv | Biblioteca Digital do IPB |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Cadavez, Vasco\",\"Person.identifier.orcid\":\"0000-0002-3077-7414\"},{\"Person.name\":\"Silva, Amélia\"},{\"Person.name\":\"Malovrh, Špela\"},{\"Person.name\":\"Kovac, Milena\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Biblioteca Digital do IPB |
| datacite.creators.creator.creatorName.fl_str_mv | Cadavez, Vasco Silva, Amélia Malovrh, Špela Kovac, Milena |
| datacite.date.Accepted.fl_str_mv | 2011-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2018-05-21T08:35:41Z |
| datacite.date.embargoed.fl_str_mv | 2018-05-21T08:35:41Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.titles.title.fl_str_mv | Estimation of genetic parameters for dairy ewes using random regression animal model |
| dc.contributor.none.fl_str_mv | Biblioteca Digital do IPB |
| dc.creator.none.fl_str_mv | Cadavez, Vasco Silva, Amélia Malovrh, Špela Kovac, Milena |
| dc.date.Accepted.fl_str_mv | 2011-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2018-05-21T08:35:41Z |
| dc.date.embargoed.fl_str_mv | 2018-05-21T08:35:41Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10198/17657 |
| dc.language.none.fl_str_mv | eng |
| dc.rights.cclincense.fl_str_mv | http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.title.fl_str_mv | Estimation of genetic parameters for dairy ewes using random regression animal model |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_c94f |
| description | The objective of the study was to compare different models in the estimation of genetic parameters for test-day milk records in Churra da Terra Quente (CTQ) ewes. Data comprising 10700 test-day measurements from the first lactation of 3096 ewes were used in analysis of morning milk yield (MMY), afternoon milk yield (AMY), and daily milk yield (DMY). Records before 30 and after 150 days in milk were discharged. Average milk yield was 217.1 g. 198.3 g. and 415.4 g for MMY, AMY, and DMY, respectively. Pedigree le contained 5494 animals. Simple fixed regression animal model (FRM) and random regression animal models (RRM), where ortogonal Legendre polynomials of order 3 were used. The REML method as implemented in the VCE-5 programme was applied for estimation of (co)variance components. Statistical models contained linear regression on days in milk and number of lambs born as fixed effects, while Jock-test-day, permanent environment of a ewe, and direct additive genetic effect were treated as random. Estimates of heritability from FRM were low, from 1.9% fat AMY to 8.2% for AJMY. Heritability estimates from RRM presented a maximum at 60 days of lactation (>- 33.9%) and decreased to values lower than 2.5% at the end of lactation. There is a potential for using random regression to model additive genetic and permanent environmental effects for genetic evaluation in CTQ ewes, especially from the first two thirds of lactation when decision on mating has to be taken. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | conferenceObject |
| fulltext.url.fl_str_mv | https://bibliotecadigital.ipb.pt/bitstreams/72b69a80-6872-4d2a-833e-b95c10b987d8/download |
| id | ipb_a5f599819ea700d71ed6832dc2c53ff2 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10198/17657 |
| instacron_str | ipb |
| institution | Instituto Politécnico de Bragança |
| instname_str | Instituto Politécnico de Bragança |
| language | eng |
| network_acronym_str | ipb |
| network_name_str | Biblioteca Digital do IPB |
| oai_identifier_str | oai:bibliotecadigital.ipb.pt:10198/17657 |
| organization_str_mv | urn:organizationAcronym:ipb |
| person_str_mv | Cadavez, Vasco Cadavez, Vasco https://www.ciencia-id.pt/441B-01AB-A12E 441B-01AB-A12E http://orcid.org/0000-0002-3077-7414 0000-0002-3077-7414 Silva, Amélia Malovrh, Špela Kovac, Milena |
| publishDate | 2011 |
| reponame_str | Biblioteca Digital do IPB |
| repository_id_str | urn:repositoryAcronym:ipb |
| service_str_mv | urn:repositoryAcronym:ipb |
| spelling | engpt_PTThe objective of the study was to compare different models in the estimation of genetic parameters for test-day milk records in Churra da Terra Quente (CTQ) ewes. Data comprising 10700 test-day measurements from the first lactation of 3096 ewes were used in analysis of morning milk yield (MMY), afternoon milk yield (AMY), and daily milk yield (DMY). Records before 30 and after 150 days in milk were discharged. Average milk yield was 217.1 g. 198.3 g. and 415.4 g for MMY, AMY, and DMY, respectively. Pedigree le contained 5494 animals. Simple fixed regression animal model (FRM) and random regression animal models (RRM), where ortogonal Legendre polynomials of order 3 were used. The REML method as implemented in the VCE-5 programme was applied for estimation of (co)variance components. Statistical models contained linear regression on days in milk and number of lambs born as fixed effects, while Jock-test-day, permanent environment of a ewe, and direct additive genetic effect were treated as random. Estimates of heritability from FRM were low, from 1.9% fat AMY to 8.2% for AJMY. Heritability estimates from RRM presented a maximum at 60 days of lactation (>- 33.9%) and decreased to values lower than 2.5% at the end of lactation. There is a potential for using random regression to model additive genetic and permanent environmental effects for genetic evaluation in CTQ ewes, especially from the first two thirds of lactation when decision on mating has to be taken.application/pdfpt_PTEstimation of genetic parameters for dairy ewes using random regression animal modelPersonalCadavez, VascoDSpacehttp://dspace.org/items/57b410e9-f6b7-42ff-ab3d-b526278715ebDSpacehttp://dspace.org/items/57b410e9-f6b7-42ff-ab3d-b526278715ebCadavezVascoCiência IDhttps://www.ciencia-id.pt441B-01AB-A12EORCIDhttp://orcid.org0000-0002-3077-7414Researcher IDhttps://www.researcherid.comA-3958-2010Scopus Author IDhttps://www.scopus.com9039121900Silva, AméliaMalovrh, ŠpelaKovac, MilenaHostingInstitutionOrganizationalBiblioteca Digital do IPBe-mailmailto:dspace@ipb.ptdspace@ipb.pt2018-05-21T08:35:41Z20112011-01-01T00:00:00ZHandlehttp://hdl.handle.net/10198/17657http://purl.org/coar/access_right/c_abf2open access441240 bytesother research producthttp://purl.org/coar/resource_type/c_c94fconference object2011http://creativecommons.org/licenses/by/4.0/http://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://bibliotecadigital.ipb.pt/bitstreams/72b69a80-6872-4d2a-833e-b95c10b987d8/downloadInternational Scientific Symposium: "Tradition, performance and efficiency in animal husbandry"33Iasi, Romania |
| spellingShingle | Estimation of genetic parameters for dairy ewes using random regression animal model Cadavez, Vasco |
| status | SINGLETON |
| title | Estimation of genetic parameters for dairy ewes using random regression animal model |
| title_full | Estimation of genetic parameters for dairy ewes using random regression animal model |
| title_fullStr | Estimation of genetic parameters for dairy ewes using random regression animal model |
| title_full_unstemmed | Estimation of genetic parameters for dairy ewes using random regression animal model |
| title_short | Estimation of genetic parameters for dairy ewes using random regression animal model |
| title_sort | Estimation of genetic parameters for dairy ewes using random regression animal model |
| url | http://hdl.handle.net/10198/17657 |
| visible | 1 |