Consulta: creatorFacets:"Prados,Laura Franco"
Registros recuperados: 9
Data/hora: 05/06/2024 17:18:16

Exigências de proteína de animais Nelore puros e cruzados com as raças Angus e Simental
Provedor de dados: 96
Autores: Marcondes,Marcos Inácio; Valadares Filho,Sebastião de Campos; Oliveira,Ivanna Moraes de; Valadares,Rilene Ferreira Diniz; Paulino,Mário Fonseca; Prados,Laura Franco.
Objetivou-se estimar as exigências de proteína de animais Nelore, Nelore-Angus e Nelore-Simental, assim como a eficiência de uso da proteína metabolizável para ganho. Foram utilizados 69 animais (23 Nelore, 23 Nelore-Angus e 23 Nelore-Simental): 12 (quatro de cada grupo genético) foram abatidos antes do início do experimento, como grupo-referência, e nove animais foram separados para um ensaio de digestibilidade. Os animais restantes foram divididos em três dietas (ofertas de concentrado na base de 1 ou 2% do peso corporal à vontade e 1% do nível de mantença). Ao final do experimento, todos os animais foram abatidos e a composição corporal e o peso de corpo vazio (PCVZ) determinados. O consumo de proteína metabolizável (CPmet) foi estimado pela proteína...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cruzamento industrial; Eficiência de uso da proteína; Exigências; Proteína líquida; Proteína metabolizável; Terminação.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001000025

Prediction of non-carcass components in cattle
Provedor de dados: 96
Autores: Costa e Silva,Luiz Fernando; Marcondes,Marcos Inácio; Valadares Filho,Sebastião de Campos; Ribeiro,André Mauric Frossard; Prados,Laura Franco; Nascimento,Fernando Barros; Gionbelli,Mateus Pies; Santos,Ronald Matos dos.
This study was conducted to develop equations to predict chemical composition of head, limbs, hide and blood in cattle. A database containing 335 animals from 10 trials, with 221 Nellore, 38 Nellore-Simmental and 76 Nellore-Angus (96 steers, 118 heifers and 121 bulls) animals was used. Models were constructed to estimate water, ether extract (EE), crude protein (CP), ash and macrominerals (calcium, phosphorus, magnesium, sodium and potassium) in the non-carcass parts of cattle. A stepwise procedure was conducted to determine the most significant variables within each model. Subsequently, a random coefficient model was used to construct the equation using studies as random effect, and sex and breed as fixed effects. The visceral fat was the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blood; Carcass; Ether extract; Hide; Organs and viscera; Protein.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800015

Energy and protein nutritional requirements for Nellore bulls
Provedor de dados: 96
Autores: Silva,Luiz Fernando Costa e; Valadares Filho,Sebastião de Campos; Zanetti,Diego; Rotta,Polyana Pizzi; Marcondes,Marcos Inácio; Prados,Laura Franco; Paulino,Mário Fonseca; Azevedo,Henrique de Oliveira.
The objective of this study was to determine the nutritional requirements of energy and protein and estimate the efficiencies of metabolizable energy utilization for fat and protein deposition, as well as for maintenance (k m) and growth (k g). An experiment of comparative slaughter was carried out with thirty-seven 14-month-old (±1 month) Nellore bulls with 259±24.9 kg. Animals were divided as follows: five to reference, four to maintenance level and twenty-eight bulls feeding ad libitum. Bulls were also grouped in 4 different feedlot periods (42, 84, 126 and 168 days) for slaughter. The diet was composed of corn silage and concentrate, at a 55:45 ratio. After the slaughter, the left half carcasses were totally dissected for determination of body...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deposition; Efficiency; Growth; Maintenance; Metabolizable energy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600028

Beef quality traits of Nellore, F1 Simmental × Nellore and F1 Angus × Nellore steers fed at the maintenance level or ad libitum with two concentrate levels in the diet
Provedor de dados: 96
Autores: Oliveira,Ivanna Moraes de; Paulino,Pedro Veiga Rodrigues; Marcondes,Marcos Inácio; Valadares Filho,Sebastião de Campos; Cavali,Jucilene; Prados,Laura Franco; Duarte,Marcio de Souza; Detmann,Edenio.
This trial was conducted to evaluate some beef quality attributes of Nellore, F1 Simmental × Nellore and F1 Angus × Nellore steers finished on feedlot. The effects of feeding regime and genetic group on shear force, thawing losses, cooking (leak + evaporation) losses, total losses and muscle fiber type, as well as carcass pH and temperature during 24 h of chilling were evaluated. There was a genetic group effect on shear force, where the beef from F1 Simmental × Nellore and F1 Angus × Nellore animals had lower values than Nellore animals. Beef of the animals fed the diets with 1% and 2% of body weight on concentrated lost more liquid than the meat of the animals fed at maintenance during thawing and when considering total losses. During cooking there was a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef quality; Muscular fibers; Shear force.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200037

Intake, digestibility and nitrogen use efficiency in crossbred F1 Holstein × Zebu grazing cows
Provedor de dados: 96
Autores: Santos,Stefanie Alvarenga; Valadares Filho,Sebastião de Campos; Detmann,Edenio; Valadares,Rilene Ferreira Diniz; Ruas,José Reinaldo Mendes; Prados,Laura Franco; Amaral,Paloma de Melo; Mariz,Lays Débora Silva.
The objective of this study was to evaluate intake, digestibility and nitrogen (N) compounds use efficiency in F1 Holstein × Zebu grazing cows. Eighteen crossbred cows (six Holstein × Gir, six Holstein × Guzerat, and six Holstein × Nellore) were used in the experiment, constituting three experimental treatments in simple random samples, under the same feeding conditions. At the estimation of individual intake at grazing, titanium dioxide was used for estimating fecal excretion and indigestible neutral detergent fiber, in order to determine pasture intake. There was effect of the lactation period on nutrient intake, except for the intakes of dry matter (DM), organic matter (OM) and total digestible nutrients (TDN) in % of body weight (BW), as well as those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; Crossbreeding; Milk production; Performance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000400027

Intake and performance of confined bovine fed fresh or ensilaged sugar cane based diets and corn silage
Provedor de dados: 96
Autores: Menezes,Gustavo Chamon de Castro; Valadares Filho,Sebastião de Campos; Magalhães,Felipe Antunes; Valadares,Rilene Ferreira Diniz; Prados,Laura Franco; Detmann,Edenio; Pereira,Odilon Gomes; Leão,Maria Ignez.
It was evaluated intake, total apparent digestibility, performance and feeding behavior of bovine fed diets constituted of corn silage, crushed sugar cane given fresh or crushed and given 72 hours after storage, ensilaged sugar cane with or without 1% of calcium oxide and concentrate at the proportion of 1% of the body weight. It was used 35 bovines, distributed in a random block design, with 5 treatments and 6 repetitions. The animals were housed in collective stalls with troughs individualized by electronic gates. The animals fed diet with corn silage presented greater intake of all nutrients and greater total digestibility of dry matter, organic matter, neutral detergent fiber and total digestible nutrients, as well as greater weight gain and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine; Carcass; Digestibility; Electronic gates; Feedlot; Weight gain.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000500022

Creatinine excretion and relationship with body weight of Nellore cattle
Provedor de dados: 96
Autores: Silva,Luiz Fernando Costa e; Valadares Filho,Sebastião de Campos; Chizzotti,Mário Luiz; Rotta,Polyana Pizzi; Prados,Laura Franco; Valadares,Rilene Ferreira Diniz; Zanetti,Diego; Braga,Jercyane Maria da Silva.
The objective of this study was to estimate the urinary creatinine excretion by the shrunk body weight (SBW). In experiment I, 32 Nellore bulls with initial body weight of 259±24.9 kg and 14±1 months-old were used. The group was divided in four animals to maintenance and twenty eight animals feeding ad libitum and separated in four groups; each group was slaughtered at different times of feedlot (42, 84, 126 and 168 days). The diet was composed of corn silage and concentrate (55:45). Before the slaughters, the total urinary collection was realized during three days. A database of creatinine excretion was collected from other five studies that had been conducted with Nellore cattle. In all the studies, the total urinary collection was realized during at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude protein; Muscle tissue; Total collection; Urine.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300046

Protein requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios
Provedor de dados: 96
Autores: Souza,Evaristo Jorge Oliveira de; Valadares Filho,Sebastião de Campos; Guim,Adriana; Valadares,Rilene Ferreira Diniz; Marcondes,Marcos Inácio; Ferreira,Marcelo de Andrade; Prados,Laura Franco; Benedeti,Pedro del Bianco.
This study aimed to determine the protein requirements for females of Nellore, F1 Nellore × Angus and F1 Nellore × Simmental fed on two concentrate levels (30 and 50%). Sixty heifers from three genetic groups with 18 months of age were used: 20 Nellore, 20 Nellore × Angus and 20 Nellore × Simmental. Twelve heifers of the reference group (four of each genetic group) were slaughtered at the beginning of the experiment. Another 12 heifers (four of each genetic group) were fed on the level of maintenance and 36 heifers (12 animals of each genetic group) were kept in power system ad libitum with 30% (six of each group) or 50% (six of each group) dietary dry matter in concentrate. Heifers were randomly assigned to six treatments in a 3 × 2 factorial arrangement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crossbred; Heifers; Metabolizable protein and net protein.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300040

Mycotoxin contamination of diets for beef cattle finishing in feedlot
Provedor de dados: 96
Autores: Custódio,Letícia; Prados,Laura Franco; Yiannikouris,Alexandros; Holder,Vaughn; Pettigrew,James; Kuritza,Leandro; Resende,Flávio Dutra de; Siqueira,Gustavo Rezende.
ABSTRACT The objective of this survey was to identify what mycotoxins were present in ingredients used in diets offered to beef cattle in feedlots and their concentrations. The survey covered 30 Brazilian feedlots located in the five major beef-producing states. Samples of total mixed ration (TMR) and ingredients were collected and analyzed for mycotoxin using ultra-performance liquid chromatography coupled to tandem mass spectrometry. Mycotoxin concentrations were further interpreted according to known species-specific sensitivities and normalized according to the principles of toxic equivalent factors (risk equivalent quantities - REQ) expressed in µg kg−1 of aflatoxin B1-equivalent. Forty percent of the visited feedlots had apparent fungi in TMR....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxin; Beef cattle; Feedlots; Fumonisin; Ingredients.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100724