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| Registros recuperados: 4.991 | |
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| Pötter,Luciana; Lobato,José Fernando Piva; Mielitz Netto,Carlos Guilherme A.. |
| Este trabalho avaliou, por intermédio de simulações, a economicidade de sistemas de produção de bovinos de corte com novilhas primíparas aos dois (sistema "um ano"), três (sistema "dois anos") e quatro anos (sistema "tradicional") de idade. No sistema "um ano", as fêmeas tiveram três sistemas nutricionais por 100 dias, após a desmama no primeiro outono-inverno, constituída por uma das três alternativas: a) pastejo contínuo em pastagem cultivada de azevém - PAST; b) pastejo contínuo em pastagem natural e suplementação com ração - CNR; c) confinamento com silagem de sorgo + uréia - SIL. Após os 100 dias, as novilhas foram mantidas em conjunto, utilizando-se pastagens naturais melhoradas. Os modelos usados, para comparar os sistemas foram construídos em uma... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Custos variáveis; Economicidade em bovinos de corte; Idade ao primeiro parto; Margem bruta; Sistemas de produção. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982000000300032 |
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| Poncheki,Jessica Karina; Canha,Maria Luíza Schultz; Viechnieski,Sandro Luiz; Almeida,Rodrigo de. |
| The objective of this study was to describe daily body weight (BW) changes in the first 100 days of lactation in confined dairy cows and to associate BW loss with productive and reproductive performance. Data included 26,344 daily BW measurements of 372 Holsteins calving between June 2011 and June 2012 in a commercial herd in the South of Brazil. Cows were automatically weighed and were assigned according to parity. Individual measurements were smoothed using cubic splines, generating nadir BW, days to nadir BW and the BW loss (absolute and relative values). This approach used days in milk (DIM) as a single smoothing variable. Body weight at calving differed across parities: 570.5, 653.5, and 699.9 kg, for the 1st, 2nd and 3rd and subsequent parities,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body weight loss; Milk production; Pregnancy ratio; Transition period. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000500187 |
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| Seixas Filho,José Teixeira de; Brás,José de Moura; Gomide,Andréa Tassis de Mendonça; Oliveira,Maria Goreti de Almeida; Donzele,Juarez Lopes; Menin,Eliane. |
| Os objetivos do presente trabalho foram estudar a anatomia funcional e a morfometria comparativas nos intestinos médio e no reto, do peixe Teleostei, surubim, Pseudoplatystoma coruscans (Agassiz, 1829) (Siluriformes, Siluroidei, Pimelodidae), de hábito alimentar carnívoro, em duas classes de tamanho, visando fornecer referência à nutrição para o ajuste de diferentes sistemas de alimentação artificial para essa espécie nativa. Por meio destes estudos concluiu-se que o intestino do surubim, sob o ponto de vista morfológico, deve ser denominado, de intestino médio e reto, devido a presença da valva ileorretal e da invaginação valvar intestinal entre esses segmentos. Em relação ao padrão de enrolamento do intestino, apesar do plano geral do intestino médio e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomia; Peixe de água doce; Surubim; Teleósteos. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982001000700003 |
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| Seixas Filho,José Teixeira de; Brás,José de Moura; Gomide,Andréa Tassis de Mendonça; Oliveira,Maria Goreti de Almeida; Donzele,Juarez Lopes; Menin,Eliane. |
| O objetivo do presente trabalho foi estudar a anatomia funcional e a morfometria comparativas nos intestinos médio e posterior e nos cecos pilóricos da piracanjuba (Brycon orbignyanus Valenciennes, 1849) (Characiformes, Characidae, Bryconinae). Foram conduzidos estudos anatomofuncionais e morfométricos nos intestinos médio e posterior e nos cecos pilóricos dessa espécie com hábito alimentar onívoro. Constatou-se, por meio destes estudos, que o padrão de enrolamento das alças intestinais em arranjo em N apresentou, na segunda classe de tamanho, freqüentes variações no intestino médio, mas foi compatível com os de outras espécies de hábitos alimentares similares. Os estudos da morfometria mostraram que o comprimento total do intestino e das alças intestinais... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomia; Nutrição; Peixe de água doce; Piracanjuba; Teleósteos. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982000000200001 |
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| Brito,Cláudio José Freixieiro Alves de; Rodella,Roberto Antonio; Deschamps,Francisco Carlos; Alquini,Yedo. |
| Neste trabalho quantificaram-se as principais alterações histológicas ocorridas em cultivares de capim-elefante (Pennisetumpurpureum Schumach.), em três estádios de desenvolvimento. A degradação dos tecidos foi avaliada após incubação em líquido ruminal de bovinos. As porcentagens de tecidos presentes em colmo, quilha, limbo e bainha foliares foram determinadas. A quilha e o colmo apresentaram maior proporção de tecido lignificado, enquanto o limbo foliar, maior quantidade de tecido epidérmico e tecido vascular não-lignificado. O tecido parenquimático foi encontrado em menor proporção na bainha foliar, principalmente pela presença do aerênquima, a partir da segunda coleta. A proporção de tecido lignificado aumentou com a maturidade do vegetal, sendo mais... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomia vegetal; Degradação de tecidos; Forrageira; Lignina; Parede celular; Ruminante. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35981999000200001 |
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| Pazdiora,Raul Dirceu; Resende,Flávio Dutra de; Faria,Marcelo Henrique de; Siqueira,Gustavo Rezende; Almeida,Geraldo Benedito de Souza; Sampaio,Ricardo Linhares; Pacheco,Paulo Santana; Prietto,Murilo Sergio Rodrigues. |
| The objective of this study was to evaluate animal performance and carcass characteristics of 64 Nellore young bulls at 22 months of age finished in a feedlot and slaughtered at five body weights (350; 455; 485; 555 and 580 kg) fed diets containing coated or uncoated urea. The experimental design adopted was completely randomized, set in a 4 × 2 factorial arrangement, and for the variables assessed in the control animals, it was 5 × 2. No effect of interaction between slaughter weights and diets were observed, so the variables were analyzed separately, compared by polynomial contrasts and by the F test, respectively. The time animals remained in the feedlot to reach slaughter weights was 66, 88, 145 and 194 days. Average daily gain (ADG) showed quadratic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body composition; Fat thickness; Feed efficiency; Feedlot; Gain yield; High grain rations. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000400007 |
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| Encinas,Christian Michael Alvarez; Villalobos,Guillermo Villalobos; Viveros,Joel Domínguez; Flores,Gabriela Corral; Almora,Enrique Alvarez; Rangel,Francisco Castillo. |
| ABSTRACT The objective of this study was to evaluate the effect of a mixture of direct-fed microbials (DFM), yeast, and digestive enzymes on animal performance in feedlot cattle, as well as digestibility when finishing feedlot cattle. Thirty crossbreed (Charolais × Beefmaster) steers averaging 15 months old and 321.83±3.73 kg of initial body weight were used. Animals were randomly assigned to one of two treatment groups: control (basal diet) and a mixture of DFM, yeast, and digestive enzymes (basal diet + 30 g of the mixture). Each group contained fifteen experimental units. Animals were fed individually twice a day, and dry matter intake (DMI) was recorded daily. Body weights were recorded initially and subsequently at 28-day intervals for a total of 140... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enzymes; Finishing; Probiotics; Saccharomyces cerevisiae; Yeast. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100615 |
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| Euclides,Valéria Pacheco Batista; Montagner,Denise Baptaglin; Barbosa,Rodrigo Amorim; Valle,Cacilda Borges do; Nantes,Nayana Nazareth. |
| ABSTRACT The objective of the present study was to evaluate live weight gain per animal and per area and its relationship with the characteristics of pastures of Brachiaria brizantha cv. Paiaguás and Piatã. A randomized blocks experimental design was used, with two treatments and six replicates. The experimental area was 8.0 ha, divided into twelve paddocks of 0.67 ha. The grazing method used was continuous stocking, with variable stocking rate. Three tester steers were used per paddock. Sward heights were measured once a week, and the stocking rate (SR) was adjusted using regulator steers to maintain the sward height at 30 cm. Pasture samples were collected once a month, and herbage accumulation rate (HAR), percentage of leaves (PL), leaf:stem ratio... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Canopy structure; Herbage accumulation; Nutritive value; Stocking rate. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000300085 |
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| Canto,Marcos Weber do; Bona Filho,Amadeu; Moraes,Aníbal de; Hoeschl,André Ricardo; Gasparino,Eliane. |
| Nitrogen (N) at 100, 200, 300, and 400 kg ha-1 was applied to Tanzania grass swards to evaluate the animal response and relationships between sward characteristics and the performance of young Nellore bulls (Bos indicus) under continuous stocking. A completely randomized experimental design was used with two replications between 11 November 2001 and 15 April 2002 when the sward heights were maintained at 60 cm by using different stocking rates. The average daily gain (ADG) (0.73 kg d-1) was not affected by N doses while the number of animal days ha-1 increased linearly from 515 to 1267. On the other hand, the linear increase in the animal yield was 399, 653, 755, and 895 kg ha-1 for N at 100, 200, 300, and 400 kg ha-1, respectively, while the ratio between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal performance; Nitrogen fertilization; Panicum maximum; Tropical grass. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700003 |
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| Araújo,Gilson Mendes; Silva,José Humberto Vilar da; Vieites,Flávio Medeiros; Moraes,George Henrique Kling de; Souza,Rafael Barbosa de; Barbosa,Anderson de Almeida; Caramori Junior,João Garcia. |
| The objective of this study was to evaluate the chemical composition and bone strength of the tibiotarsus of broilers at 7 and 14 days of age. Bone percentages of collagenous protein (CPr), non-collagenous protein (NCPr) and minerals (calcium, phosphorus, potassium and sodium) were determined. The experiment utilized 650 male Cobb chicks at one day of age, fed corn and soybean meal-based diets. The experimental design was of random blocks with five treatments, five replicates and 26 birds per experimental unit. The treatments consisted of a basal diet supplementated with NH4Cl to obtain five levels (-50, 0, 50, 100 and 150 mEq/kg) of electrolyte balance (EB). The levels of EB influenced the following characteristics: ash and potassium content; Ca:P ratio... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrolyte balance; Locomotor disorders; Metabolic acid; Tibiotarsus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000900021 |
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| Rekaya,Romdhane; Robbins,Kelly. |
| In recent years there has been much focus on the use of single nucleotide polymorphism (SNP) fine genome mapping to identify causative mutations for traits of interest; however, many studies focus only on the marginal effects of markers, ignoring potential gene interactions. Simulation studies have show that this approach may not be powerful enough to detect important loci when gene interactions are present. While several studies have examined potential gene interaction, they tend to focus on a small number of SNP markers. Given the prohibitive computation cost of modeling interactions in studies involving a large number SNP, methods need to be develop that can account for potential gene interactions in a computationally efficient manner. This study adopts... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genome; Simulation; SNP. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001300011 |
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| Souza,Clóvis José Pascarelli; Matta,Marcos Fernandes Resende da; Cruz,Gilson Mendes; Alves,Elias Walter; Kanashiro,Milton Massaricho; Silva,José Frederico Straggiotti. |
| Neste trabalho, foi purificada uma proteína macho específica com peso molecular de 19 Kda, a partir de espermatozóides de bovinos, por intermédio de cromatografia de gel filtração. O anticorpo monoclonal (Mab) desenvolvido (C11F) contra esta proteína discriminou duas populações de espermatozóides, como revelado por imunofluorescência em microscopia e citometria de fluxo. O epitopo reconhecido pelo Mab C11F esteve presente em 49,7% da população de espermatozóides. Quando adicionado ao sêmen bovino fresco, o Mab C11F reduziu a motilidade e promoveu a aglutinação dos espermatozóides. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Espermatozóides; Bovinos; Imunosexagem; Proteína macho específica; Ac. monoclonal. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35981999000100010 |
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| Zeoula,Lucia Maria; Machado,Erica; Carraro,Jocasta; Aguiar,Sílvia Cristina; Yoshimura,Emerson Henri; Agustinho,Bruna Calvo; Santos,Fabio Seiji dos; Santos,Nadine Woruby. |
| ABSTRACT The objective of this study was to evaluate the effect of adding ground soybeans and antioxidants to diet of buffaloes on intake, ruminal microbial production, total and ruminal digestibility of nutrients, and ruminal fermentation parameters. Four crossbred buffaloes with a mean weight of 506±29 kg were distributed in a 4×4 Latin square. Four diets were tested: control; diet with ground soybeans; diet with ground soybeans and supplementation with yerba mate; and diet with ground soybeans and supplementation with yerba mate and vitamin E. The addition of ground soybeans had negative effects on intake of dry matter, organic matter, crude protein, neutral detergent fiber, and acid detergent fiber, as well as ruminal digestibility of neutral detergent... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ether extract; Polyphenols; Ruminal manipulation; Ruminal metabolism; Tocopherol. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100709 |
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| Oliveira,Maryelle Durães de; Mello,Heloisa Helena de Carvalho; Stringhini,José Henrique; Mascarenhas,Alessandra Gimenez; Arnhold,Emmanuel; Conceição,Edemilson Cardoso da; Martins,Julyana Machado da Silva; Silva Júnior,Adesvaldo José e. |
| ABSTRACT This work aimed to investigate the antioxidant capacity of the guava agroindustrial waste as a functional additive in broiler feed to improve the performance and meat quality of boilers. The experiment was conducted in a completely randomized design, consisting of four treatments and six replicates with 12 birds. Treatments included different levels of guava byproduct in the feed: 0, 0.5, 1.0, and 1.5%. We evaluated the performance of broilers at 7 and 21 days old. At 21 days old, two birds from each experimental unit were euthanized for intestine histologic evaluation (duodenum, jejunum, and ileum) and breast and deboned thigh samples were collected for analyzes of pH, colorimetry (L*, a*, and b*), and thiobarbituric reactive substances (TBARS).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal-performance indexes; Antioxidant; Intestinal histology; Meat characteristics; Psidium guajava L. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100505 |
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| Williams,Carey A.. |
| Evidence of oxidative stress in horses has been described in reports dealing with intense and endurance exercise. Oxidative stress occurs when antioxidant systems are insufficient causing oxidation to potentially damage DNA, proteins, and lipids, and contribute to degenerative changes. Vitamin E is the most commonly supplemented antioxidant in horses and has been shown that horses in exercise conditioning may require higher intakes of vitamin E than recommended. Also in various species vitamin C potentiates the effects of vitamin E; however, under maintenance conditions horses have the ability to synthesize sufficient ascorbate, the demand increases as stress on the body is increased. Competitive endurance horses were estimated to consume 1.2 to 5-times... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equine; Lipoic acid; Oxidative stress; Vitamin E. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300017 |
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| Petit,Hélène V.. |
| This manuscript reports on the main problems decreasing productivity of dairy cows (e.g. fatty liver syndrome and poor fertility) and how antioxidants could enhance it. High producing dairy cows are prone to oxidative stress, and the situation can be exacerbated under certain environmental, physiological, and dietary conditions. Antioxidants have important effects on the expression of genes involved in the antioxidant status, which may enhance animal health and reproduction. Moreover, antioxidants may contribute to decrease the incidence of spontaneous oxidized flavour in milk enriched in polyunsaturated fatty acids. Plant lignans are strong antioxidants and flax is the richest source of plant lignans. Flax lignans are converted in the mammalian lignans... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant; Bovine; Flaxseed; Metabolism. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001300035 |
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| Façanha,Débora Andréa Evangelista; Silva,Roberto Gomes da; Maia,Alex Sandro Campos; Guilhermino,Magda Maria; Vasconcelos,Angela Maria de. |
| This work aimed to study the annual variation of temperature of the coat surface and other traits of coat in Holstein cows managed in a tropical environment by separately considering black coat and white coat. It was measured the coat thickness (mm) characteristic, hair length (mm), hair number (hair/cm²) and coat surface temperature on 191 crossbred cows with 7/8 and 31/32 Holstein composition distributed in 3 herds in a semi-arid environment. Less dense coats with shorter, flattened hair occurred predominantly in March, a time coinciding to high levels of solar radiation. This type of coat shows low resistance to the flux of latent and sensitive heat through the skin, thus favoring heat loss. The black coat surface temperature was on average 4ºC higher... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adaptation; Dairy cattle; Hair coat; Tropical environment. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400020 |
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| Registros recuperados: 4.991 | |
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