Resumo
SUMMARY The objectives were to evaluate diets containing levels of in natura linseed oil (1.0, 3.8 and 5.2% of diet DM) on carcass characteristics and meat cuts, and correlate these results with in vivo body measures of 14 heifers and 15 steers Nellore x Canchim. The animals were confined individually receiving 20% of sugar cane as roughage and 80% concentrate, in a complete randomized block (oil content x sexual condition). All animals of each block were slaughtered when the average body weight reached 500 kg. No interactions between treatments were observed. Add up to 5.2% of linseed oil in diet of crossbred cattle increases the weight of the main carcass cuts, reduce the loss during cooling and does not change the level of renal pelvic-inguinal fat. Heifers and steers Nellore x Canchim produce similar amounts of weight and yield hindquarters meat. Along with body weight, the extent pelviano contour is the most indicated to assist the formation of homogeneous lots for slaughter or trial, because showed the best correlation with the characteristics used in the Brazilian market of meat, such as weight and carcass yield.
RESUMO Os objetivos foram avaliar dietas contendo teores de óleo de linhaça in natura (1,0; 3,8 e 5,2% da MS da dieta) sobre as características da carcaça e cortes cárneos, e correlacionar esses resultados com medidas corporaisin vivo de 14 fêmeas e 15 machos castrados Nelore x Canchim. Os animais foram confinados individualmente recebendo 20% de cana-de-açúcar como volumoso e 80% de concentrado, em um delineamento de blocos ao acaso (teores de óleo x condição sexual). Todos os animais de cada bloco foram abatidos quando o peso corporal médio atingiu 500 kg. Não foram observadas interações entre os fatores estudados. Acrescentar até 5,2% de óleo de linhaçain natura da dieta de bovinos cruzados aumenta o peso dos principais cortes cárneos da carcaça, reduz as perdas no resfriamento e não altera o teor de gordura renal-pélvica-inguinal. Fêmeas e machos castrados Nelore x Canchim produzem quantidades similares de carne do traseiro especial, em peso e rendimento. Juntamente com o peso corporal, a medida do contorno pelviano é a mais indicada para auxiliar na formação de lotes homogêneos para o abate ou experimentação, por apresentar as melhores correlações com as características utilizadas na comercialização brasileira de carne, como peso e rendimento da carcaça.
Resumo
SUMMARY The objectives were to evaluate diets containing levels of in natura linseed oil (1.0, 3.8 and 5.2% of diet DM) on carcass characteristics and meat cuts, and correlate these results with in vivo body measures of 14 heifers and 15 steers Nellore x Canchim. The animals were confined individually receiving 20% of sugar cane as roughage and 80% concentrate, in a complete randomized block (oil content x sexual condition). All animals of each block were slaughtered when the average body weight reached 500 kg. No interactions between treatments were observed. Add up to 5.2% of linseed oil in diet of crossbred cattle increases the weight of the main carcass cuts, reduce the loss during cooling and does not change the level of renal pelvic-inguinal fat. Heifers and steers Nellore x Canchim produce similar amounts of weight and yield hindquarters meat. Along with body weight, the extent pelviano contour is the most indicated to assist the formation of homogeneous lots for slaughter or trial, because showed the best correlation with the characteristics used in the Brazilian market of meat, such as weight and carcass yield.
RESUMO Os objetivos foram avaliar dietas contendo teores de óleo de linhaça in natura (1,0; 3,8 e 5,2% da MS da dieta) sobre as características da carcaça e cortes cárneos, e correlacionar esses resultados com medidas corporaisin vivo de 14 fêmeas e 15 machos castrados Nelore x Canchim. Os animais foram confinados individualmente recebendo 20% de cana-de-açúcar como volumoso e 80% de concentrado, em um delineamento de blocos ao acaso (teores de óleo x condição sexual). Todos os animais de cada bloco foram abatidos quando o peso corporal médio atingiu 500 kg. Não foram observadas interações entre os fatores estudados. Acrescentar até 5,2% de óleo de linhaçain natura da dieta de bovinos cruzados aumenta o peso dos principais cortes cárneos da carcaça, reduz as perdas no resfriamento e não altera o teor de gordura renal-pélvica-inguinal. Fêmeas e machos castrados Nelore x Canchim produzem quantidades similares de carne do traseiro especial, em peso e rendimento. Juntamente com o peso corporal, a medida do contorno pelviano é a mais indicada para auxiliar na formação de lotes homogêneos para o abate ou experimentação, por apresentar as melhores correlações com as características utilizadas na comercialização brasileira de carne, como peso e rendimento da carcaça.
Resumo
Feed is the most expensive input in any livestock production system including beef cattle, therefore feed efficiency improvements can contribute to cost reduction. Residual feed intake (RFI) is one of the important measures of animal efficiency and can be defined as the difference between actual feed intake (measure at individual or group pens) and predicted feed intake that is required for the observed rate of gain and body weight (BW). The objective here was to evaluate the housing type (individual or group) on variation of traits such as dry matter intake (DMI, kg/d and %BW), average daily gain (ADG), RFI and gain:feed (G:F) in a dataset of Nellore young bulls obtained from performance tests of 83±16 days long after adaptation period, conducted between 2007 and 2013. The animals (273 ± 27 days of age at the beginning of the test) were obtained from selected, traditional and control Nellore lines of Instituto de Zootecnia. The animals were housed in individuals pens (IP) (2007-2012) or group pens (GP) (2012-2013) equipped with the GrowSafe® system (voluntary intake calculated automatically by the system). In IP, animals were fed twice a day and had water available all the time. Voluntary food intake was calculated as the difference between supplied and refused food. Leftovers were collected daily, weighed, and then adjusted to correspond to 10% of the total supplied. A mixed
O artigo não apresenta resumo em português.
Resumo
Feed is the most expensive input in any livestock production system including beef cattle, therefore feed efficiency improvements can contribute to cost reduction. Residual feed intake (RFI) is one of the important measures of animal efficiency and can be defined as the difference between actual feed intake (measure at individual or group pens) and predicted feed intake that is required for the observed rate of gain and body weight (BW). The objective here was to evaluate the housing type (individual or group) on variation of traits such as dry matter intake (DMI, kg/d and %BW), average daily gain (ADG), RFI and gain:feed (G:F) in a dataset of Nellore young bulls obtained from performance tests of 83±16 days long after adaptation period, conducted between 2007 and 2013. The animals (273 ± 27 days of age at the beginning of the test) were obtained from selected, traditional and control Nellore lines of Instituto de Zootecnia. The animals were housed in individuals pens (IP) (2007-2012) or group pens (GP) (2012-2013) equipped with the GrowSafe® system (voluntary intake calculated automatically by the system). In IP, animals were fed twice a day and had water available all the time. Voluntary food intake was calculated as the difference between supplied and refused food. Leftovers were collected daily, weighed, and then adjusted to correspond to 10% of the total supplied. A mixed
O artigo não apresenta resumo em português.