Navegando por Assunto "feedlot"

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    Desempenho de bovinos confinados alimentados com dietas à base de farelo de algodão, uréia ou amiréia
    (1999) Seixas, José Renato Caleiro; Ezequiel, Jane Maria Bertocco; Araújo, Walter de Albuquerque; Resende, Flavio Dutra de; Martins Junior, Ademir; Kronka, Sérgio do Nascimento; Silva, Leandro das Dores Ferreira da; Dourado, Juliana Borsari; Soares, Weber Vilas Boas
    The objective of this experiment was to evaluate the performance of feedlot beef cattle fed diets supplemented with protein concentrate based on cottonseed meal (CSM) urea (UR) or starea (ST), using corn silage as forage. The feedlot period was 80 days. The diets were constituted maintaining the forage:concentrate proportion in the 63:37 level, with nearly 13% CP. No difference was observed in daily weight gain during the experimental period among the CSM, UR or ST treatments (1.14, 1.17, and 1.23 Kg/anim•day) or in the dry matter intakes in % LW (2.63, 2.60, and 2.60), g/kg0.75•day (136.19, 134.74, and 134.81) or kg/anim.•day (9.42, 9.35, and 9.40), respectively. The CP intakes values were 1.28, 1.24, and 1.34 kg of CP/anim.•day and 18.54, 17.86, and 19.24 g/kg.75 •day for the CMS, UR or ST treatments and they did not differ among each other. Values of feed:gain ratios obtained for dry matter were 8.41, 8.01, and 7.67 kg DMI/kg DWG and for the protein:gain ratios, 1.15, 1.06, and 1.09 kg CPI / Kg DWG, respectively, for the CPM, UR and ST treatments, that were similar. O objetivo deste experimento foi avaliar o desempenho de bovinos em confinamento alimentados com rações suplementadas com concentrados protéicos à base de farelo de algodão (AL), uréia (UR) ou amiréia (AM), tendo como volumoso silagem de milho. O confinamento teve duração de 80 dias. As rações foram compostas mantendo a proporção volumoso:concentrado no nível de 63:37, com aproximadamente 13% PB. Não se constataram diferenças quanto ao ganho de peso diário (GDP) durante o período experimental total entre os tratamentos AL, UR ou AM (1,14; 1,17; e 1,23 kg/anim.•dia), ou na ingestão de MS em % PV (2,63; 2,60; e 2,60% PV), em g/kg0,75•dia (136,19; 134,74; e 134,81) ou kg/anim.•dia (9,42; 9,35; e 9,40), respectivamente. Os valores de ingestão de PB foram de 1,28; 1,24; e 1,34 kg de PB/anim.•dia e de 18,54; 17,86; e 19,24 g/kg0,75•dia para os tratamentos AL, UR ou AM, não diferindo entre si. Valores obtidos para conversão alimentar da matéria seca foram de 8,41; 8,01; e 7,67 kg MSI/kg GPD e para conversão protéica, 1,15; 1,06; e 1,09 kg PBI/kg GPD, respectivamente, para os tratamentos AL, UR e AM, que foram semelhantes.
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    Desempenho e características de carcaça de novilhos alimentados com dietas contendo diferentes fontes de lipídios
    (2005) Aferri, Gabriela; Leme, Paulo Roberto; Silva, Saulo da Luz e; Putrino, Soraia Marques; Pereira, Angélica Simone Cravo
    The objective of this trial was to evaluate the animal performance, carcass characteristics and meat tenderness of 36 crossbred steers averaging 14 months old and 320 kg body weight. The animals were fed high concentrate-based diets: control - without additional fat (CO); diet with 5% calcium salt of fatty acids (AG); and diet with 21% whole cottonseed (CA). Dry matter intake of AG treatment was lower (P=0,05) than CA, that differ from CO diet. No significant differences of treatments on daily weight gain and feed efficiency were observed. Blood urea nitrogen was greater (P=0,01) for CA treatment than AG treatment. Carcass dressing, rib eye area, fat thickness, kidney and pelvic fat, liver weight, pH and temperature did not show significant difference. No difference on water loss during cooking and tenderness measured by shear force at different aging times was detected. Diets with 5% calcium salt of fatty acids or 21% whole cottonseed can be used for feedlot with no change on animal performance or carcass characteristics. Este trabalho foi realizado para se avaliar o desempenho animal, as características da carcaça e a maciez da carne de 36 novilhos mestiços, apresentando, ao início do experimento, média de 14 meses de idade e aproximadamente 320 kg de peso vivo. Os animais foram confinados e receberam dietas com alto teor de concentrado: uma controle (CO), sem adição de lipídios; outra contendo 5% de sais de cálcio de ácidos graxos (AG); e outra com 21% de caroço de algodão (CA). A ingestão de matéria seca no tratamento AG foi menor que no CA, mas não diferiu da ingestão do CO. O ganho médio diário e a eficiência alimentar não apresentaram diferenças significativas entre os tratamentos. Os valores encontrados para a análise de uréia sangüínea foram significativamente maiores no tratamento CA em relação ao AG. O rendimento de carcaça, a área de olho de lombo, a espessura de gordura, as gorduras renal e pélvica, o peso do fígado, o pH e a temperatura não foram significativamente diferentes. Não houve diferença também para o índice de perda de água por cozimento e maciez, verificada pela força de cisalhamento nos diferentes tempos de maturação. Os sais de cálcio de ácidos graxos a 5% e o caroço de algodão a 21% podem ser empregados nas rações para confinamento, sem causarem alterações no desempenho animal ou nas características de carcaça.
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    Development and evaluation of models to estimate body chemical composition of young Nellore bulls
    (2017) Silva, Luiz Henrique Oliveira; Bonilha, Sarah Figueiredo Martins; Branco, Renata Helena; Cyrillo, Joslaine Noely dos Santos Gonçalves; Mercadante, Maria Eugênia Zerlotti
    ABSTRACT The objective of this study was to develop accurate regression equations to predict body composition of Nellore cattle using chemical composition of the 9th, 10th, and 11th ribs and to evaluate the models proposed by analyzing mean and linear bias. Sixty-seven Nellore bulls were slaughtered and slaughter body weight (SBW), hot carcass weight (HCW), and 9th-, 10th-, and 11th-rib-cut weight (RCW) were measured. Empty body composition was obtained after grinding, homogenizing, sampling, chemical analysis, and pooling (blood, skin, head + feet, viscera, and carcass). Chemical components were determined in rib cut, carcass, and empty body: protein (RCP, HCP, and EBP), fat (RCF, HCF, and EBF), ash (RCA, HCA, and EBA), and water (RCWt, HCWt, and EBWt). Stepwise options were used to determine variables to be included and excluded from regressions. Predictive ability of equations was verified using standard error of prediction, coefficient of determination, and Cp statistic. Regression estimates were tested to evaluate the models in a database different from that used for equation development. The best equations found to predict carcass components, in kg, were: HCF = -0.994 + 0.123 × SBW - 9.201 × RCW + 34.249 × RCF (R² = 0.86) and HCWt = 2.733 - 0.172 × SBW + 0.821 × HCW - 23.939 × RCF + 12.186 × RCWt (R² = 0.96). For empty body, the best equations, in kg, were: EBF = -1.4 + 0.166 × SBW - 10.073 × RCW + 40.202 × RCF (R² = 0.90) and EBWt = 3.524 + 0.272 × SBW + 0.373 × HCW - 11.727 × RCW + 31.079 × RCWt (R² = 0.98). Body weight has a high predictive power and should be included in equations to estimate body composition of Nellore cattle. Unbiased models are valid as an indirect method for determining body composition in beef cattle.
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    Development and evaluation of models to estimate body chemical composition of young Nellore bulls
    (2017) Silva, Luiz Henrique Oliveira; Bonilha, Sarah Figueiredo Martins; Branco, Renata Helena; Cyrillo, Joslaine Noely dos Santos Gonçalves; Mercadante, Maria Eugênia Zerlotti
    ABSTRACT The objective of this study was to develop accurate regression equations to predict body composition of Nellore cattle using chemical composition of the 9th, 10th, and 11th ribs and to evaluate the models proposed by analyzing mean and linear bias. Sixty-seven Nellore bulls were slaughtered and slaughter body weight (SBW), hot carcass weight (HCW), and 9th-, 10th-, and 11th-rib-cut weight (RCW) were measured. Empty body composition was obtained after grinding, homogenizing, sampling, chemical analysis, and pooling (blood, skin, head + feet, viscera, and carcass). Chemical components were determined in rib cut, carcass, and empty body: protein (RCP, HCP, and EBP), fat (RCF, HCF, and EBF), ash (RCA, HCA, and EBA), and water (RCWt, HCWt, and EBWt). Stepwise options were used to determine variables to be included and excluded from regressions. Predictive ability of equations was verified using standard error of prediction, coefficient of determination, and Cp statistic. Regression estimates were tested to evaluate the models in a database different from that used for equation development. The best equations found to predict carcass components, in kg, were: HCF = -0.994 + 0.123 × SBW - 9.201 × RCW + 34.249 × RCF (R² = 0.86) and HCWt = 2.733 - 0.172 × SBW + 0.821 × HCW - 23.939 × RCF + 12.186 × RCWt (R² = 0.96). For empty body, the best equations, in kg, were: EBF = -1.4 + 0.166 × SBW - 10.073 × RCW + 40.202 × RCF (R² = 0.90) and EBWt = 3.524 + 0.272 × SBW + 0.373 × HCW - 11.727 × RCW + 31.079 × RCWt (R² = 0.98). Body weight has a high predictive power and should be included in equations to estimate body composition of Nellore cattle. Unbiased models are valid as an indirect method for determining body composition in beef cattle.
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    Influence of lamb finishing system on animal performance and meat quality
    (2019) Gallo, Sarita Bonagurio; Arrigoni, Mario de Beni; Lemos, Ana Lúcia da Silva C.; Haguiwara, Márcia Mayumi Harada; Bezerra, Helena Viel Alves
    ABSTRACT. This study aimed to assess the influence of lamb finishing systems on zootechnical performance, as well as on carcass and meat quality. The experiment was conducted at the APTA’s experimental farm. Thirty-three lambs were used - both sexes, initial age of 90 ± 3 days, Texel with Santa Inês, each animal being one experimental unit, with 6 males and 5 females per treatment. Treatments consisted of: lambs finished on pasture, in semi-feedlot or in feedlot. The lambs were slaughtered with average live weight of 35 kg. Weight gain and carcass measures were taken by ultrasound. After slaughter, carcass conformation and yield, pH, temperature, color, water retention capacity and tenderness were measured. Animals finished on pasture had lower weight gain, were slaughtered at an older age, with lighter carcass weight, smaller loin area, lower shank compactness index, besides lighter shoulder and shank weights, compared to the other production systems (p < 0.05). There was no difference between the semi-feedlot and the feedlot systems for the assessed characteristics. In conclusion, production systems affect animal performance, as well as carcass and meat quality, especially when it comes to important production aspects, such as slaughter age and yield of premium cuts.
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    Performance and carcass characteristics of Nellore young bulls fed different sources of oils, protected or not from rumen degradation
    (2013) Rosa, Bruna Laurindo; Sampaio, Alexandre Amstalden Moraes; Henrique, Wignez; Oliveira, Emanuel Almeida de; Pivaro, Thiago Martins; Andrade, Antonio Tadeu de; Fernandes, Alexandre Rodrigo Mendes
    The objective was to evaluate the addition of vegetable oils protected or not from rumen degradation in the diet of feedlot-finished young bulls and their effects on performance and carcass characteristics. Thirty-five Nellore males of 402.69±14.90 kg initial weight and 18±2 months of age were utilized. The animals were confined for 96 days, after 28 days of adaptation, and slaughtered at 532.17±30.25 kg. Experimental diets were: control (715 g total digestible nutrients - TDN/kg of dry matter - DM), with addition of soybean oil or fresh linseed oil, and with the addition of the same oils protected from rumen degradation (765 g TDN/kg DM). All diets were formulated with the same amount of protein and with a roughage:concentrate ratio of 40:60, with sugarcane as the only roughage. The addition of oil, regardless of the type and processing, resulted in greater body weight gain (1.17 and 1.41 kg/animal/day), better feed (0.11 and 0.14 kg weight gain/kg DM ingested) and protein efficiency (0.86 and 1.09 kg weight gain/kg crude protein ingested), heavier carcasses (280.3 and 298.0 kg), with better yield (54.5 and 55.5%) and thicker subcutaneous fat (5.1 and 7.5 mm backfat thickness) and with heavier prime cuts, for control diet and the other treatments, respectively. The use of soybean or linseed oil protected or not from rumen degradation only changed the intake of a few nutrients and carcass yield and depth. Thus the addition of energy sources in the diet is beneficial for finishing feedlot bulls. For this addition, either soybean or linseed oils can be used, and the processing of these oils is only useful to facilitate the mixing with the other ingredients of the diet.