Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil
The objectives of this study were to estimate genetic parameters for testday milk, fat and protein yields, in Murrah buffaloes. In this study 4,757 complete lactations of Murrah buffaloes were analyzed. The (co) variance components were estimated by restricted maximum likelihood using MTDFREML softw...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2010-02-01
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| Series: | Italian Journal of Animal Science |
| Subjects: | |
| Online Access: | http://www.aspajournal.it/index.php/ijas/article/view/996 |
| _version_ | 1818026111454412800 |
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| author | A. Bignardi H. Tonhati L. Seno R. Sesana A. Tanaka L. Albuquerque R. Aspilcueta-Borquis |
| author_facet | A. Bignardi H. Tonhati L. Seno R. Sesana A. Tanaka L. Albuquerque R. Aspilcueta-Borquis |
| author_sort | A. Bignardi |
| collection | DOAJ |
| description | The objectives of this study were to estimate genetic parameters for testday milk, fat and protein yields, in Murrah buffaloes. In this study 4,757 complete lactations of Murrah buffaloes were analyzed. The (co) variance components were estimated by restricted maximum likelihood using MTDFREML software. The bi-trait animal test-day models included genetic additive direct and permanent environment effects, as random effects, and the fixed effects of contemporary group (herds-year-month of control) and age of the cow at calving as linear and quadratic covariable. The heritability estimate at first control was 0.19, increased until the third control (0.24), decreasing thereafter, reaching the lowest value at the ninth control (0.09). The highest heritability estimates for fat and protein yield were 0.23 (first control) and 0.33 (third control), respectively. For milk yield, genetic and phenotypic correlation estimates ranged from 0.37 to 0.99 and from 0.52 to 0.94, respectively. Genetic correlations were higher than phenotypic ones. For fat and protein yields, genetic correlation estimates ranged from 0.42 to 0.97. |
| first_indexed | 2024-12-10T04:26:49Z |
| format | Article |
| id | doaj.art-ed6d9448aa284ee5afc06fcb7c951ffa |
| institution | Directory Open Access Journal |
| issn | 1594-4077 1828-051X |
| language | English |
| last_indexed | 2024-12-10T04:26:49Z |
| publishDate | 2010-02-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Italian Journal of Animal Science |
| spelling | doaj.art-ed6d9448aa284ee5afc06fcb7c951ffa2022-12-22T02:02:16ZengTaylor & Francis GroupItalian Journal of Animal Science1594-40771828-051X2010-02-0162s36837110.4081/ijas.2007.s2.368Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in BrazilA. BignardiH. TonhatiL. SenoR. SesanaA. TanakaL. AlbuquerqueR. Aspilcueta-BorquisThe objectives of this study were to estimate genetic parameters for testday milk, fat and protein yields, in Murrah buffaloes. In this study 4,757 complete lactations of Murrah buffaloes were analyzed. The (co) variance components were estimated by restricted maximum likelihood using MTDFREML software. The bi-trait animal test-day models included genetic additive direct and permanent environment effects, as random effects, and the fixed effects of contemporary group (herds-year-month of control) and age of the cow at calving as linear and quadratic covariable. The heritability estimate at first control was 0.19, increased until the third control (0.24), decreasing thereafter, reaching the lowest value at the ninth control (0.09). The highest heritability estimates for fat and protein yield were 0.23 (first control) and 0.33 (third control), respectively. For milk yield, genetic and phenotypic correlation estimates ranged from 0.37 to 0.99 and from 0.52 to 0.94, respectively. Genetic correlations were higher than phenotypic ones. For fat and protein yields, genetic correlation estimates ranged from 0.42 to 0.97.http://www.aspajournal.it/index.php/ijas/article/view/996Phenotypic correlation estimates, Genetic correlation estimates, Heritability estimates. |
| spellingShingle | A. Bignardi H. Tonhati L. Seno R. Sesana A. Tanaka L. Albuquerque R. Aspilcueta-Borquis Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil Italian Journal of Animal Science Phenotypic correlation estimates, Genetic correlation estimates, Heritability estimates. |
| title | Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil |
| title_full | Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil |
| title_fullStr | Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil |
| title_full_unstemmed | Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil |
| title_short | Genetic parameters estimates for milk, fat and protein yield analyzed by test day models for Murrah buffaloes in Brazil |
| title_sort | genetic parameters estimates for milk fat and protein yield analyzed by test day models for murrah buffaloes in brazil |
| topic | Phenotypic correlation estimates, Genetic correlation estimates, Heritability estimates. |
| url | http://www.aspajournal.it/index.php/ijas/article/view/996 |
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