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| Registros recuperados: 11 | |
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| Mello,Renius; Queiroz,Augusto César de; Faria,Marcelo Henrique de; Henrique,Douglas Sampaio; Maldonado,Fabiana. |
| The objective of this study was to assess the bionutritional efficiency of crossbred F1 Red Angus × Nellore (½ RA ½ N) and F1 Blonde D'Aquitaine × Nellore (½ BA ½ N) young bulls finished on feedlot and slaughtered at 480, 520 and 560 kg body weight. A completely randomized experimental design in a 2 × 3 (genetic group × slaughter weight) factorial arrangement with six replicates was used. The ½ BA ½ N young bulls showed higher kidney, pelvic and inguinal fat (KPIF, kg and % BW) and lower multivariate biological nutritional index (MBNI) and residual feed intake than ½ RA ½ N young bulls. The young bulls slaughtered at heavier weight had larger ribeye area (cm²), fat thickness over the 12-13th rib, fat thickness over the rump, KPIF (kg and % BW), dry matter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal performance; Feed efficiency; Feed conversion; Kleiber ratio; Multivariate biological nutritional index; Residual feed intake. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000300018 |
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| Castilhos,André Michel de; Branco,Renata Helena; Corvino,Tatiana Lucila Sobrinho; Razook,Alexander George; Bonilha,Sarah Figueiredo Martins; Figueiredo,Leopoldo Andrade de. |
| Two Nellore herds were compared, one selected for greater postweaning weight and the other, control, selected for average postweaning weight, to evaluate the effects of 29 years of selection on feed efficiency. Sixty Nellore males (41 selected and 19 control) averaging 205 kg and 267 days of age were evaluated in individual pens during performance test. Performance and dry matter intake were used to determine the following feed efficiency traits: feed conversion; residual feed intake; residual gain; partial growth efficiency; relative growth rate and Kleiber ratio. After the 112-day experimental period, control animals showed lower body weight when compared to selected animals, however, they did not differ for dry matter intake (% of body weight), rib-eye... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Feed conversion; Residual feed intake; Selection. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100023 |
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| Grima, Laure; Chatain, Beatrice; Ruelle, Francois; Vergnet, Alain; Launay, Amandine; Mambrini, Muriel; Vandeputte, Marc. |
| Selective breeding to improve residual feed intake (RFI) in sea bass (Dicentrarchus labrax) is a major goal that would optimize economic gain while minimizing the environmental impact of production. Due to the difficulty in accurately measuring individual feed intake, no selective breeding program has yet been started. In a previous study, we identified a criterion phenotypically related to RFI variations: the loss of weight during feed deprivation, FD. Moreover, an additional composite criterion (CC) integrating both FD and weight gain during subsequent re-feeding (RF) was closely related to RFI, even though the relationship was only close to significance (P=0.06). The aim of the present study was to estimate the heritability of these two traits, in order... |
| Tipo: Text |
Palavras-chave: European sea bass; Dicentrarchus labrax; Feed efficiency; Heritability; Genetic parameters; Residual feed intake; Feed deprivation; Compensatory growth; Selective breeding. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00004/11529/8213.pdf |
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| Grima, Laure; Vandeputte, Marc; Ruelle, Francois; Vergnet, Alain; Mambrini, Muriel; Chatain, Beatrice. |
| No commercial breeding programs have yet started to improve feed utilization efficiency in fish, mainly because of the difficulty in accurately measuring individual feed intake in fish reared in groups. Our general goal is to propose indirect criteria to be used for breeding of commercial lines. In a previous study undertaken with rainbow trout clones, a genetic correlation was detected between residual feed intake (RFI), and body weight variation during successive periods of feed deprivation (FD) and re-feeding (RF). To assess the pertinence of such indirect criteria for future breeding programs, we set up a large experiment using sea bass (Dicentrachus labrax), a recently domesticated species with broad genetic diversity. The objectives of the present... |
| Tipo: Text |
Palavras-chave: European sea bass; Dicentrachus labrax; Feed efficiency; Residual feed intake; Feed deprivation; Compensatory growth; Selective breeding. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00002/11297/7838.pdf |
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| Guimarães,André Lasmar; Mercadante,Maria Eugênia Zerlotti; Canesin,Roberta Carrilho; Branco,Renata Helena; Lima,Maria Lucia Pereira; Cyrillo,Joslaine Noely dos Santos Gonçalves. |
| ABSTRACT The objective of this study was to evaluate the associations between feed efficiency and feeding behavior, growth and carcass traits in Senepol cattle. A total of 137 animals were evaluated. Of these animals, 36 males were evaluated in a second test, totaling 173 records (initial age of 466±96 days and initial weight of 426±104 kg). Residual feed intake (RFI) was calculated as the difference between observed and expected dry matter intake, estimated by regression of dry matter intake on average daily gain and metabolic body weight (BW0.75), and the animals were classified as negative (high efficiency) and positive RFI (low efficiency). The mean RFI was -0.838±0.078 and 0.797±0.075 kg DM day-1 for negative and positive RFI animals, respectively,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Feed intake; Residual feed intake. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000100047 |
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| Arthur,J P.F.; Herd,R.M.. |
| Providing feed is a major input cost in beef production, hence improvements in the efficiency of feed utilisation will reduce the cost of production. Residual feed intake (RFI) is a measure of feed efficiency, and is defined as the difference between an animal's actual feed intake and its expected feed intake based on its size and growth. It is independent of the level of production, and the lower the value the more efficient the animal is. This paper examines the current state of knowledge on RFI. Available information indicates that postweaning RFI is moderately heritable, and that selection for low RFI will result in progeny that consume less feed for the same level of production as progeny of high RFI cattle. Under ad libitum feeding, RFI is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cattle; Feed efficiency; Growth; Residual feed intake. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008001300031 |
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| Carneiro,Mayara Mitiko Yoshihara; Morais,Maria da Graça; Souza,Andréa Roberto Duarte Lopes; Fernandes,Henrique Jorge; Feijó,Gelson Luís Dias; Bonin,Marina de Nadai; Franco,Gumercindo Loriano; Rocha,Raizza Fátima Abadia Tulux. |
| ABSTRACT We evaluated performance, non-carcass components, and carcass characteristics of crossbred Texel lambs in different categories of residual intake and gain (RIG). We assessed 77 crossbred (¼ Pantaneira and ¾ Texel) non-castrated animals in two study phases. The first phase included 47 lambs with an initial average weight of 29.9±5.5 kg, and the second phase included 30 lambs with initial average weight of 22.4±3.3 kg. Dry matter intake (DMI) and average daily gain (ADG) were evaluated for 70 days. Animals were divided into three groups in terms of efficiency: efficient (high RIG), intermediate (medium RIG), or inefficient (low RIG), based on the standard deviation of the mean for the RIG variable. We measured the yield of non-carcass components,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feedlot; Residual feed intake; Sheep; Tissue composition; Visceral fat. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100704 |
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| Castilhos,André Michel de; Branco,Renata Helena; Razook,Alexander George; Bonilha,Sarah Figueiredo Martins; Mercadante,Maria Eugênia Zerlotti; Figueiredo,Leopoldo Andrade de. |
| This study was conducted to determine optimum test duration for measuring performance, feed intake and feed efficiency. Sixty young Nellore bulls were submitted to feeding performance test and fed in individual pens to determine feed intake and performance over 112 days. Body weight was determined every 28 days, after fasting of water and feed for 16 hours. Changes in variance, relative variance and Pearson and Spearman correlations among data from shortened test periods (28, 56 and 84 days) and full test period (112 days) were used to determine optimum test duration. Test duration for average daily gain, dry matter intake, feed:gain ratio and residual feed intake could be shortened to 84, 28, 84 and 84 days, respectively, without reducing significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Feeding performance test; Residual feed intake. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200010 |
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| Registros recuperados: 11 | |
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