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| Aspilcueta-Borquis,Rusbel Raúl; Sesana,Roberta Cristina; Berrocal,Milthon Honorio Munoz; Seno,Leonardo de Oliveira; Bignardi,Annaiza Braga; El Faro,Lenira; Albuquerque,Lucia Galvão de; Camargo,Gregório Miguel Ferreira de; Tonhati,Humberto. |
| The objective of the present study was to estimate genetic parameters for test-day milk, fat and protein yields and 305-day-yields in Murrah buffaloes. 4,757 complete lactations of Murrah buffaloes were analyzed. Co-variance components were estimated by the restricted maximum likelihood method. The models included additive direct genetic and permanent environmental effects as random effects, and the fixed effects of contemporary group, milking number and age of the cow at calving as linear and quadratic covariables. Contemporary groups were defined by herd-year-month of test for test-day yields and by herd-year-season of calving for 305-day yields. The heritability estimates obtained by two-trait analysis ranged from 0.15 to 0.24 for milk, 0.16 to 0.23 for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Test-day model; Accumulated productions; Heritability; Genetic correlations. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100014 |
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| Cardoso,Vera Lucia; Lima,Maria Lucia Pereira; Nogueira,José Ramos; Carneiro,Raul Lara Resende de; Sesana,Roberta Cristina; Oliveira,Elisa Junqueira; El Faro,Lenira. |
| The objective of this study was to calculate economic values for milk (MY), protein (PY) and fat productions (FY) and somatic cell count (SCC) which could be used to compose an economic index to rank animals involved in an international genetic evaluation program of Holstein cattle used in the commercial dairy population in Brazil. The main milk production systems (MPS) prevailing in the South and Southeast were defined based on the feeding management and production level of herds. To calculate feeding costs, energy requirements for the production of one kg of milk with the respective average protein and fat contents of each MPS were calculated. Feeding costs were obtained based on the regional prices of the diets' components. To calculate revenues, milk... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Milk composition; Selection index. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001200636 |
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