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| Registros recuperados: 717 | |
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| Petrini,Juliana; Dias,Raphael Antonio Prado; Pertile,Simone Fernanda Nedel; Eler,Joanir Pereira; Ferraz,José Bento Sterman; Mourão,Gerson Barreto. |
| The objective of this work was to assess the degree of multicollinearity and to identify the variables involved in linear dependence relations in additive-dominant models. Data of birth weight (n=141,567), yearling weight (n=58,124), and scrotal circumference (n=20,371) of Montana Tropical composite cattle were used. Diagnosis of multicollinearity was based on the variance inflation factor (VIF) and on the evaluation of the condition indexes and eigenvalues from the correlation matrix among explanatory variables. The first model studied (RM) included the fixed effect of dam age class at calving and the covariates associated to the direct and maternal additive and non-additive effects. The second model (R) included all the effects of the RM model except the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bos taurus x Bos indicus; Animal breeding; Beef cattle; Correlation matrix; Crossbreeding; Variance inflation factor. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012001200010 |
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| Costa,Patrícia Monteiro; Barbosa,Fabiano Alvim; Alvarenga,Ramon Costa; Guimarães,Sérgio Teixeira; Lampeão,Ângelo André; Winkelströter,Larissa Kretli; Maciel,Isabella Cristina de Faria. |
| Abstract: The objective of this work was to evaluate the performance of crossbred steers post-weaned in an integrated crop-livestock system (ICL) and finished in a feedlot, fed either a high-level concentrate diet or whole corn with no roughage. Weaned calves of two breed groups - ½ Angus × ½ Nellore, and ½ Charolais × ¼ Angus × ¼ Nellore - were allotted in a completely randomized experimental design (CRD). During the rainy season, the ½ Angus × ½ Nellore animals showed a higher performance than the ½ Charolais × ¼ Angus ×¼ Nellore ones, with 0.748 and 0.490 kg average daily gain, respectively. The productivity in the post-weaning period was 926 kg ha-1 body weight in a 11-month period, in the ICL system. Subsequently, the animals were confined and fed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Crossbreeding; Feed intake; Integrated systems; Intensification.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000500355 |
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| Carvalho,Caio Victor Damasceno; Bittencourt,Thereza Cristina Calmon de. |
| Abstract:The objective of this work was to define the traits that should be included as breeding objectives for Nellore cattle, according to simulations with a bio-economic model for rearing systems. The economic values (EVs) of the traits were calculated as the differences between the profits due to an increased performance of 1% in each trait, with the others traits remaining constant. To determine the impact of each selection on the revenue system, two scenarios were simulated based on the traits being selected. In the first scenario, the adopted selection criteria were: weaning weight (WW), weaning rate (WR), yearling weight (YW), and mature cow weight (MCW). In the second scenario, the cumulative productivity (CP) of dams was used as an indirect... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Bio-economic model; Economic value; Market fluctuation; Selection criteria.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000900814 |
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| Dias,Victor Augusto Domingos; Curi,Rogério Abdallah; Pereira,Guilherme Luis; Malheiros,Jéssica Moraes; Espigolan,Rafael; Albuquerque,Lúcia Galvão de; Chardulo,Luis Artur Loyola; Oliveira,Henrique Nunes de. |
| Abstract: The objective of this work was to estimate allelic frequencies of the polymorphisms IGF2/MboII (G > T) of the insulin-like growth factor 2 (IGF2) gene, DQ499531.1:g.134A > T of the pro-melanin-concentrating hormone (PMCH) gene, and DQ667048.1:g.3290G > T of the RARrelated orphan receptor C (RORC) gene in beef cattle of different genetic groups, and to evaluate the associations between these polymorphisms and traits related to carcass composition and meat quality. Data on carcass and meat quality of 499 animals was used: of 313 Nellore (Bos indicus) and of 186 Nellore crossed with different taurine (Bos taurus) breeds. For the IGF2/MboII polymorphism, the frequencies found for the G allele were 0.231 and 0.631 for Nellore and crossed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bos indicus; Beef cattle; Beef quality; Polymorphism.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000200169 |
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| Borges,Bárbara Oliveira; Curi,Rogério Abdallah; Baldi,Fernando; Feitosa,Fabieli Loise Braga; Andrade,Willian Bruno Fernandes de; Albuquerque,Lucia Galvão de; Oliveira,Henrique Nunes de; Chardulo,Luis Artur Loyola. |
| The objective of this work was to estimate the allele polymorphism frequencies of genes in Nellore cattle and associate them with meat quality and carcass traits. Six hundred males were genotyped for the following polymorphisms: DGAT1 (VNTR with 18 nucleotides at the promoter region); ANK1, a new polymorphism, identified and mapped here at the gene regulatory region NW_001494427.3; TCAP (AY428575.1:g.346G>A); and MYOG (NW_001501985:g.511G>C). In the association study, phenotype data of hot carcass weight, ribeye area, backfat thickness, percentage of intramuscular fat, shear force, myofibrillar fragmentation index, meat color (L*, a*, b*), and cooking losses were used. Allele B from the ANK1 gene was associated with greater redness (a*). Alleles 5R,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bos indicus; Ankyrin; Assisted selection; Beef cattle; Myogenin; Titin. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000500364 |
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| Farah,Michel Marques; Fortes,Marina Rufino Salinas; Kelly,Matthew; Porto-Neto,Laercio Ribeiro; Meira,Camila Tangari; Carreño,Luis Orlando Duitama; Fonseca,Ricardo da; Moore,Stephen Stewart. |
| Abstract: The objective of this work was to evaluate the effects of genomic information on the genetic evaluation of hip height in Brahman cattle using different matrices built from genomic and pedigree data. Hip height measurements from 1,695 animals, genotyped with high-density SNP chip or imputed from 50 K high-density SNP chip, were used. The numerator relationship matrix (NRM) was compared with the H matrix, which incorporated the NRM and genomic relationship (G) matrix simultaneously. The genotypes were used to estimate three versions of G: observed allele frequency (HGOF), average minor allele frequency (HGMF), and frequency of 0.5 for all markers (HG50). For matrix comparisons, animal data were either used in full or divided into calibration (80%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bos indicus; Beef cattle; Genomics; Rare alleles. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600717 |
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| Cavani,Ligia; Silva,Rafael Medeiros de Oliveira; Carreño,Luis Orlando Duitama; Ono,Rafael Keith; Bertipaglia,Tássia Souza; Farah,Michel Marques; Millen,Danilo Domingues; Fonseca,Ricardo da. |
| Abstract: The objective of this work was to evaluate the genetic diversity of Brahman cattle in Brazil with pedigree analysis. Genealogical records of a subpopulation were used considering all pedigree information (Pt) and the pedigree information divided into two periods (P1, from 1994 to 2004; and P2, from 2005 to 2012) or according to the raising system (Ppt, animals on pasture; or Pst, on stable). Estimates were obtained for average inbreeding coefficients, generation intervals (GI), number of equivalent known generation (CGE), number of founders (Nf), effective number of founders (fe), effective number of ancestors (fa), and founder genome equivalents (fg). The average inbreeding coefficients were 11.97, 7.79, 11.95, 11.74, and 11.31% for Pt, P1, P2,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Founders; Genetic bottleneck; Inbreeding. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100074 |
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| Sereno,José Robson Bezerra; Costa e Silva,Eliane Vianna da; Mores,Cristiano Mougenot. |
| This work was conducted to study alternatives for reduction of the bull:cow ratio in the Brazilian lowland and, therefore, lower the production costs for the local beef cattle industry. The ratios 1:10, 1:25, and 1:40 were used in native pastures with a mean stocking rate of 0.27 mature animal unit per hectare over two consecutive breeding seasons. Statistical analysis did not show any effect (P>0.05) of year (P = 0.2097), animal category (P = 0.0773), bull:cow ratio (0.8134) on reproductive performance. However, the pregnancy rate in a multiple bull system was higher (P = 0.0228) than in the individual bull system. An evaluation of the economic impact of this management system in the extensive Lowland herds showed that at the ratio of 1:10 the bulls... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Livestock management; Production costs; Animal production. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001200019 |
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| MacLeod, Neil D.; Wen, Shilin; Hu, Mingwen. |
| The rapidly growing beef cattle herd of the Peoples Republic of China is largely carried as small numbers of animals on smallholder farms. These enterprises have traditionally focussed on cereal and vegetable crops. Limited plantings of specialised forages combined with a poor knowledge of ruminant nutrition by sm allholder farmers represent a serious challenge to establishing genuinely sustainable beef enterprises for this sector. Government policy to promote beef cattle production on smallholder farms is now focussing on the use of new forages and improved feeding practices. The paper draws on some economic insights from an Australian Centre for International Agricultural Research (ACIAR) project that is exploring options for integrating the planting and... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Beef cattle; Forages; Red Soils Region; China; Economics; Livestock Production/Industries; 03; Q12; Q16. |
| Ano: 2006 |
URL: http://purl.umn.edu/25588 |
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| Dargatz, David. |
| As part of the National Animal Health Monitoring System (NAHMS ), USDA:APHIS:Veterinary Services conducted a national study of beef production, the Beef Cow/Calf Health and Productivity Audit (CHAPA). This study was designed to provide both participants and the industry with information on cow/calf health, productivity, and management practices. The National Agricultural Statistics Service (NASS) collaborated with USDA:APHIS:VS to select a producer sample that was statistically designed to provide inferences about the nation's cow/calf population. Data for Part IV: Beef Cow/Calf Breeding Management were collected by federal and state veterinary officers (VMO's) in 18 of the largest cow/calf producing states between July 1 and July 30, 1993. These 18 states... |
| Tipo: Report |
Palavras-chave: NAHMS; Epidemiology; Beef cattle; Calves; Breeding; Mortality; Grazing; Trichomonas fetus; Vaccination; Deworming; Palpation; Livestock Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/32753 |
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| Dargatz, David. |
| As part of the National Animal Health Monitoring System (NAHMS ), USDA:APHIS:Veterinary Services conducted a national study of beef production, the Beef Cow/Calf Health and Productivity Audit (CHAPA). This study was designed to provide both participants and the industry with information on cow/calf health, productivity, and management practices. Data for Part III: Beef Cow/Calf Health & Health Management were collected by federal and state veterinary officers (VMO's) in 18 of the largest cow/calf producing states between January 4 and February 28, 1993. These 18 states represented 70 percent of the U.S. beef cow inventory. Participating producers had five or more beef cows or beef replacement heifers and fifty percent or more of their 1992 calf crop... |
| Tipo: Report |
Palavras-chave: NAHMS; Epidemiology; Beef cattle; Calves; Breeding; Calving; Calf crop; Replacement heifers; Economics; Sales; Disease; Parasites; Pinkeye; Scours; Livestock Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/32748 |
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| Registros recuperados: 717 | |
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