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| 1. |  | BASÌLIO, M. B. J. S.; NOBREGA FILHO, S. L. da; BATISTA, K. D.; PEDROZO, C. A.; SOUZA, L. A. de. Substratos para produção de mudas de angelim-ferro. In: SEMANA NACIONAL DE CIÊNCIA E TECNOLOGIA, 16., 2022, Boa Vista, RR. "Da Independência do Brasil à Emancipação Tecno-Científica do Estado de Roraima": Boletim de resumos. Boa Vista: Editora UFRR, 2022. 442 p. il. Coordenado por: Bianca Maíra de Paiva Ottoni Boldrini; Ivanise Maria Rizzatti; Rafael Boldrini.| Biblioteca(s): Embrapa Roraima. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
07/03/2013 |
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Data da última atualização: |
18/07/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
GOMES, R. da C.; SAINZ, R. D.; SILVA, S. L.; CESAR, M. C.; BONIN, M. N.; LEME, P. R. |
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Afiliação: |
RODRIGO DA COSTA GOMES, CNPGC; R.D.Sainz, University of California; S.L.Silva, Universidade de São Paulo (FZEA/USP); M.C.Cesar, Universidade de São Paulo(FZEA/USP); M.N.Bonin, Universidade de São Paulo(FZEA/USP); P.R.Leme, Universidade de São Paulo(FZEA/USP). |
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Título: |
Feedlot performance, feed efficiency reranking, carcass traits, body composition, energy requirements, meat quality and calpain system activity in Nellore steers with low and high residual feed intake. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Livestock Science, v.150, p.265-273, Dec. 2012. Issue 1-3. |
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Idioma: |
Inglês |
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Conteúdo: |
The aim was to evaluate growth, carcass traits, feed efficiency reranking, body composition, calpain system activity and meat quality in Nellore steers that were phenotypically ranked for high and low residual feed intake (RFI). Seventy-two Nellore steers (16?21 month-old, 334±19 kg BW) had free access to a feedlot diet for 70 d (feeding period 1, P1). Daily dry matter intake (DMI), body weight gain (ADG) and ultrasound carcass traits were measured individually. The 12 lowest and the 12 highest RFI steers were classed as low- and high-RFI groups and were fed for a second feeding period (feeding period 2, P2). Spearman's rank correlation was performed for RFI and gain-to-feed ratio (G:F) measured over P1 and P2. The carcass traits, meat quality and calpain system activity were evaluated at slaughter, and body composition was determined. In P1, low-RFI steers had greater G:F (0.159 vs. 0.134; P<0.001), lower DMI (9.30 vs. 11.1 kg/d; P<0.0001), lower RFI (−0.80 vs. 0.85 kg/d; P<0.0001), and tended to have lower rates of rump fat gain (4.48 vs. 6.05 mm; P=0.06), but no differences were observed for ADG, BW, and other traits measured by ultrasound (P>0.05). In P2, no differences between RFI classes were observed for G:F and DMI as a percentage of BW (P>0.05), and small differences were observed for DMI (8.25 vs. 8.99 kg/d, P<0.05) and RFI (−0.28 vs. +0.29 kg/d, P=0.06). The ranking correlations for RFI and G:F measured consecutively in P1 and P2 were low to moderate (r=0.11?0.40). Low-RFI steers had lower requirements of metabolizable energy (ME) for maintenance (131 vs. 160 Mcal/kg EBW0.75 d−1, P<0.05), but no differences were observed for fat and protein gain, retained energy and efficiency of ME use for gain (P>0.05). No differences between low- and high-RFI steers were observed for carcass traits at slaughter; however, low-RFI steers had 8.1 kg less gastrointestinal fat than high-RFI steers. There were no RFI effects on meat shear force and the activities of μ-calpain, m-calpain and calpastatin (P>0.05). High-RFI steers had greater MFI in 1 d aged LM (53.9 vs. 40.8, P<0.05). The variation in feed efficiency between high- and low-RFI Nellore steers is related to differences in energy requirements and deposition of fat on internal organs. The ranking for feed efficiency is altered as cattle become older. The selection for improved RFI in Nellore cattle may reduce feed requirements for beef production without affecting meat tenderness and enzymatic activity of the calpain system. MenosThe aim was to evaluate growth, carcass traits, feed efficiency reranking, body composition, calpain system activity and meat quality in Nellore steers that were phenotypically ranked for high and low residual feed intake (RFI). Seventy-two Nellore steers (16?21 month-old, 334±19 kg BW) had free access to a feedlot diet for 70 d (feeding period 1, P1). Daily dry matter intake (DMI), body weight gain (ADG) and ultrasound carcass traits were measured individually. The 12 lowest and the 12 highest RFI steers were classed as low- and high-RFI groups and were fed for a second feeding period (feeding period 2, P2). Spearman's rank correlation was performed for RFI and gain-to-feed ratio (G:F) measured over P1 and P2. The carcass traits, meat quality and calpain system activity were evaluated at slaughter, and body composition was determined. In P1, low-RFI steers had greater G:F (0.159 vs. 0.134; P<0.001), lower DMI (9.30 vs. 11.1 kg/d; P<0.0001), lower RFI (−0.80 vs. 0.85 kg/d; P<0.0001), and tended to have lower rates of rump fat gain (4.48 vs. 6.05 mm; P=0.06), but no differences were observed for ADG, BW, and other traits measured by ultrasound (P>0.05). In P2, no differences between RFI classes were observed for G:F and DMI as a percentage of BW (P>0.05), and small differences were observed for DMI (8.25 vs. 8.99 kg/d, P<0.05) and RFI (−0.28 vs. +0.29 kg/d, P=0.06). The ranking correlations for RFI and G:F measured consecutively in P1 and P2 were low to moderate (... Mostrar Tudo |
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Palavras-Chave: |
Bovino de corte; Qualidade da carne. |
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Thesagro: |
Carcaça; Nutrição Animal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03342naa a2200229 a 4500
001 1952510
005 2019-07-18
008 2012 bl uuuu u00u1 u #d
100 1 $aGOMES, R. da C.
245 $aFeedlot performance, feed efficiency reranking, carcass traits, body composition, energy requirements, meat quality and calpain system activity in Nellore steers with low and high residual feed intake.$h[electronic resource]
260 $c2012
520 $aThe aim was to evaluate growth, carcass traits, feed efficiency reranking, body composition, calpain system activity and meat quality in Nellore steers that were phenotypically ranked for high and low residual feed intake (RFI). Seventy-two Nellore steers (16?21 month-old, 334±19 kg BW) had free access to a feedlot diet for 70 d (feeding period 1, P1). Daily dry matter intake (DMI), body weight gain (ADG) and ultrasound carcass traits were measured individually. The 12 lowest and the 12 highest RFI steers were classed as low- and high-RFI groups and were fed for a second feeding period (feeding period 2, P2). Spearman's rank correlation was performed for RFI and gain-to-feed ratio (G:F) measured over P1 and P2. The carcass traits, meat quality and calpain system activity were evaluated at slaughter, and body composition was determined. In P1, low-RFI steers had greater G:F (0.159 vs. 0.134; P<0.001), lower DMI (9.30 vs. 11.1 kg/d; P<0.0001), lower RFI (−0.80 vs. 0.85 kg/d; P<0.0001), and tended to have lower rates of rump fat gain (4.48 vs. 6.05 mm; P=0.06), but no differences were observed for ADG, BW, and other traits measured by ultrasound (P>0.05). In P2, no differences between RFI classes were observed for G:F and DMI as a percentage of BW (P>0.05), and small differences were observed for DMI (8.25 vs. 8.99 kg/d, P<0.05) and RFI (−0.28 vs. +0.29 kg/d, P=0.06). The ranking correlations for RFI and G:F measured consecutively in P1 and P2 were low to moderate (r=0.11?0.40). Low-RFI steers had lower requirements of metabolizable energy (ME) for maintenance (131 vs. 160 Mcal/kg EBW0.75 d−1, P<0.05), but no differences were observed for fat and protein gain, retained energy and efficiency of ME use for gain (P>0.05). No differences between low- and high-RFI steers were observed for carcass traits at slaughter; however, low-RFI steers had 8.1 kg less gastrointestinal fat than high-RFI steers. There were no RFI effects on meat shear force and the activities of μ-calpain, m-calpain and calpastatin (P>0.05). High-RFI steers had greater MFI in 1 d aged LM (53.9 vs. 40.8, P<0.05). The variation in feed efficiency between high- and low-RFI Nellore steers is related to differences in energy requirements and deposition of fat on internal organs. The ranking for feed efficiency is altered as cattle become older. The selection for improved RFI in Nellore cattle may reduce feed requirements for beef production without affecting meat tenderness and enzymatic activity of the calpain system.
650 $aCarcaça
650 $aNutrição Animal
653 $aBovino de corte
653 $aQualidade da carne
700 1 $aSAINZ, R. D.
700 1 $aSILVA, S. L.
700 1 $aCESAR, M. C.
700 1 $aBONIN, M. N.
700 1 $aLEME, P. R.
773 $tLivestock Science$gv.150, p.265-273, Dec. 2012. Issue 1-3.
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