Consulta: subjectFacets:"Crossbred bulls"
Registros recuperados: 2
Data/hora: 01/06/2024 02:38:41

Alternatives for analysis of performance data and ranking of Charolais x Nellore crossbred bulls in performance tests
Provedor de dados: 96
Autores: Toral,Fábio Luiz Buranelo; Alencar,Maurício Mello de.
It was evaluated alternatives for analysis of performance records and ranking of Charolais x Zebu crossbred bulls. Data of weight at six ages and average daily weight gain in eight periods of 883 21/32 Charolais + 11/32 Nellore bulls in performance tests were used. The direct additive genetic values were predicted in single trait analysis using animal models with classificatory fixed effects of contemporary groups and age of dam at calving and age of animal at weighing as linear covariable, depending on the trait. As random effects, it was considered the direct additive genetic effect, the permanent maternal environmental and residual effects for all traits. Phenotypic values adjusted for fixed effects included in the model of each trait were also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crossbred bulls; Least square; Mixed models; Selection.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000700013

Energy and protein requirements of 3/4 Zebu × 1/4 Holstein crossbreds fed different calcium and phosphorus levels in the diet
Provedor de dados: 45
Autores: Prados,L.F.; Valadares Filho,S.C.; Detmann,E.; Zanetti,D.; Santos,S. A.; Sathler,D.F.T.; Mariz,L.D.S.; Borges,A.L.C.C.; Nunes,A.N.; Rodrigues,F.C.; Amaral,P.M.
The aim of this study was to determine the nutritional requirements of energy and protein for maintenance and weight gain of crossbred cattle, as well as their efficiencies. Fifty 3/4 Zebu × 1/4 Holstein crossbred bulls with initial weights of 214±4kg and aged 11±0.2 months on average were used in this experiment. Four animals were used in the reference group; ten bulls were fed at the maintenance level; and the remaining 36 bulls were fed ad libitum and distributed in a completely randomized design in a 3×3 factorial arrangement, which had three feedlot periods (56, 112 or 168 days) and three calcium and phosphorus levels (low, medium and normal) in the diet. Four of the maintenance animals had their heat production measured by respirometry at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crossbred bulls; Minerals; Nutritional requirements.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000200555