Consulta: subjectFacets:"Zebu cattle"
Registros recuperados: 10
Data/hora: 01/06/2024 04:21:40

Efeito da duracao da estacao de monta, idade do bezerro a desmama e uso estrategico de pastagem cultivada sobre a performance reprodutiva de vacas zebu.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: ROCHA, C. M. C. da; MOORE, C. P.
bitstream/item/107069/1/pesq-04.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Eficiencia; Cobricao; Zebu cattle; Efficiency.; Bezerro; Cerrado; Desmama; Gado Zebu; Pastagem Cultivada; Raça; Reprodução; Reprodução Animal; Vaca.; Calves; Cows; Copulation; Sexual reproduction; Sown pastures; Weaning.
Ano: 1980
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549351

Supplementation levels for growing beef cattle grazing in the dry-rainy transition season
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Sales,M.F.L.; Paulino,M.F.; Valadares Filho,S.C.; Figueiredo,D.M.; Porto,M.O.; Detmann,E.
The objective of this experiment was to study the effects of different levels of supplementation on the performance, intake, digestibility, pH and rumen ammonia concentration in growing bulls grazing Brachiaria decumbens Stapf. pasture, during the dry-rainy transition season. For evaluation of performance, intake and digestibility, it was used 25 non-castrated steers at 11 months of age and initial average body weight of 270 kg, grouped in five plots of five animals each, following a completely randomized design. Each plot received one of the following feeding treatments: mineral mixture and supplement at the proportion of 0.5, 1.0, 1.5 and 2.0 kg/animal/day, corresponding to 0.18, 0.36, 0.54 and 0.72% of the average body weight of the animals. The area...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Digestibility; Intake; Multiple supplements; Zebu cattle.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400027

Carcass characteristics of feedlot-finished Zebu and Caracu cattle
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Resende,Flávio Dutra de; Gesualdi Júnior,Antonio; Queiroz,Augusto César de; Faria,Marcelo Henrique de; Viana,Alexandre Pio.
This study analyzes the chemical carcass characteristics and carcass losses in 86 cattle, both castrated and non-castrated, with an average initial weight of 329 kg and an average age of approximately 20 months, including 12 Gyr, 20 Guzerat, 20 Nellore, and 20 Caracu among the herds selected for weight determination at 378 days of age, as well as 14 Nellore cattle that were not selected. The diet contained a roughage-to-concentrate ratio of 60:40 in terms of dry matter (DM), with 14.8% crude protein as a percentage of DM and corn silage as roughage. A completely randomized 5 × 2 factorial experimental design was used, including five breeds and two sex classes. The following values were determined: losses due to the trimming of commercial cuts and cooking;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feedlot; Meat quality; Shear force; Zebu cattle.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000200003

Net requirements of energy, protein and macrominerals for weight gain of grazing beef cattle castrated at different ages, with and without supplementation
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Rocha,Anilza Andréia da; Paulino,Mário Fonseca; Fernandes,Henrique Jorge; Barros,Lívia Vieira de; Lopes,Sidnei Antonio; Galon,Leandro; Silva,Aline Gomes da; Almeida,Daniel Mageste de.
The objective of this experiment was to estimate the requirements of energy, protein and macrominerals of grazing crossbreds calves, in Brachiaria decumbens Stapf pasture, castrated at different ages, with and without supplementation. Forty-seven young calves at initial age of 120±30.1 days and 115.3±1.97 kg of live weight were used. To estimate net energy requirements for weight gain, a regression equation between energy retained in the gain and empty body weight gain and metabolic empty body weight was obtained. For estimation of net protein requirements for weight gain, a regression equation was adjusted between protein retained in gain and empty body weight gain and energy content of this gain. Net requirements of Ca, P, Mg and Na for weight gain were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Castration; Supplementation; Zebu cattle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200025

Body composition and energy and protein requirements of grazing Nelore steers
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Almeida,Vitor Visintin Silva de; Queiroz,Augusto César de; Silva,Fabiano Ferreira da; Silva,Robério Rodrigues; Oliveira,Aline Cardoso; Souza,Danilo Ribeiro de.
This experimentwas carried out with the objective of determining the energy and protein requirements of grazing Nellore steers. Twenty four Nellore steers (average 371 ± 14 kg of BW and 26 months old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference for the subsequent study. The remaining 20 animals were weighed and distributed in a randomized complete block design with four levels of supplementation offers: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different levels of supplementation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy; Protein; Requirements; Zebu cattle.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700026

Selection for higher body weight in Nelore cattle is effective in achieving an increase of longissimus muscle area without reducing subcutaneous fat thickness
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Pinheiro,Tiago Roque; Mercadante,Maria Eugênia Zerlotti; Albuquerque,Lucia Galvão de; Bonilha,Sarah Figueiredo Martins; Monteiro,Fábio Morato.
The objectives of this study were to estimate heritabilities and genetic and phenotypic correlations between carcass traits measured by ultrasound and other economically important traits generally used as selection criteria in beef cattle and to estimate the genetic changes in the carcass traits as a result of selection for post-yearling weight. Carcass traits measured by ultrasound at two ages (12 and 18 months) and the correlation of these traits with weight, hip height and body condition score of males (yearling) and females (post-yearling) were analyzed. Multi-trait analysis was performed using the restricted maximum likelihood method under an animal model. To demonstrate the effect of selection for growth, phenotypic and expected breeding value means...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass traits; Correlated responses; Genetic correlation; Ultrasound; Zebu cattle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600016

Performance and carcass traits of Nellore and Red Norte steers finished in feedlot
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Machado Neto,Otávio Rodrigues; Ladeira,Márcio Machado; Gonçalves,Tarcisio de Moraes; Lopes,Leandro Sâmia; Oliveira,Dalton Mendes de; Lima,Renato Ribeiro de.
The objective of this work was to evaluate average daily gain (ADG) and carcass traits in Nellore and Red Norte steers, finished in feedlots and to evaluate performance predictions by using the systems BR-CORTE, CNCPS 5.0 and NRC (2000). It was used 41 steers: 19 Nelore animals with initial body weight of 361 ± 31 kg and 22 Red Norte animals with initial body weight of 367 ± 30 kg. Adaptation period lasted 28 days. Animal performance evaluation was composed of three 28 day period, totaling 84 days. At the end of each period, animals were weighed after a 16-hour feeding fast. Average gain weight of Red Norte steers was greater than Nellore breed animals (1.43 vs. 1.81 kg/day, respectively). Red Norte animals also presented greater loin eye area (75.41 cm²...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composite breeds; Markers; Nutritional requirements; Prediction equations; Zebu cattle.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000500020

Reaction norms models in the adjusted weight at 550 days of age for Polled Nellore cattle in Northeast Brazil
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Ambrosini,Diego Pagung; Carneiro,Paulo Luiz Souza; Braccini Neto,José; Martins Filho,Raimundo; Amaral,Rosimira dos Santos; Cardoso,Fernando Flores; Malhado,Carlos Henrique Mendes.
The objective of this study was to evaluate the genotype-environment interaction (GEI) in the body weight adjusted to 550 days of age (W550) of Polled Nellore cattle raised in Northeastern Brazil using reaction norms (RN) models. Hierarchical RN models included fixed effects for age of cow (linear and quadratic) and random effects for contemporary groups (CG) and additive genetic RN level and slope. Four RN hierarchical models (RNHM) were used. The RNHM2S uses the solutions of contemporary groups estimated by the standard animal model (AM) and considers them as environmental level for predicting the reaction norms and the RNHM1S, which jointly estimate these two sets of unknowns. Two versions were considered for both models, one with a homogeneous (Hm) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Environmental gradient; Genetic value; Random regression; Zebu cattle.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000700351

Body composition and net and dietary macrominerals requirements of Nellore steers under grazing
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Almeida,Vitor Visintin Silva de; Queiroz,Augusto César de; Silva,Robério Rodrigues; Silva,Fabiano Ferreira da; Oliveira,Aline Cardoso; Santana Júnior,Hermógenes Almeida de.
This experiment was carried out with the objective of determining the macrominerals (Ca, P, Mg, K and Na) requirements of Nellore steers under grazing. Twenty four Nellore steers (371 ± 14 kg of BW and 26 mo old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference in subsequent study. The remaining 20 animals were weighed and distributed into a completely randomized design with four supplementation levels offer: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% of BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different supplementation levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrominerals; Pasture; Requirements; Zebu cattle.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000600016

Macro mineral requirements by grazing zebu bovines
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Moraes,Eduardo Henrique Bevitori Kling de; Paulino,Mário Fonseca; Moraes,Kamila Andreatta Kling de; Valadares Filho,Sebastião de Campos; Lazzarini,Isis; Monnerat,João Paulo Ismério dos Santos; Couto,Victor Rezende Moreira; Souza,Marcos Gonçalves de.
The objective of this study was to determine requirements of calcium (Ca), phosphorus (P), magnesium (Mg), potassium (K) and sodium (Na) for grazing zebu bovines. The experiment area was composed of Brachiaria decumbens paddocks. Twenty-seven non-castrated animals, with initial live weight of 311.0 kg and at an average age of 14 months were used. Three animals were slaughtered, after adaptation period, so they were used as control for estimates of empty body weight and initial body composition of animals in the experiment. Out of the 24 remaining animals, four were sent to the maintenance group with restrict grazing time to limit energy intake close to the maintenance level. The other 20 animals were distributed in four treatments: mineral mixture,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macro minerals; Pasture; Requirement; Zebu cattle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200023