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A proposal for the evaluation of the bioeconomic efficiency of beef cattle production systems R. Bras. Zootec.
Marques,Pedro Rocha; Peripolli,Vanessa; Lampert,Vinícius do Nascimento; Dias,Eduardo Antunes; Pereira,Gabriel Ribas; Oliveira,Tamara Esteves de; Rocha,Marcela Kuczynski da; Barcellos,Júlio Otávio Jardim.
ABSTRACT The objective of this study was to identify types of production system and their main indicators on bioeconomic efficiency, using qualitative and quantitative methods to evaluate beef cattle farms in the western region of the state of Rio Grande do Sul. A survey was carried out with 43 farmers operating in the western region of that state. All farms operated with complete cycle production systems in areas larger or equal to 900 ha. A qualitative questionnaire with binary answers and a quantitative questionnaire with numerical answers were applied. Technology and Management drivers were used for the calculation of the efficiency index of farmers obtained by both questionnaires. Farmers were divided into three clusters: low-efficiency level (LEL),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle farmers; Clusters analysis; Efficiency; Evaluation methods.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000100065
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Factors affecting the selling prices of calves in auctions in Santa Catarina State, Brazil R. Bras. Zootec.
Fornari,Giordano Bruno; Menegassi,Sílvio Renato Oliveira; Pereira,Gabriel Ribas; Oliveira,Tamara Esteves de; Barcellos,Júlio Otávio Jardim.
ABSTRACT The objective of this study was to investigate the effects of genetic group and calf sex on selling prices in auctions in the state of Santa Catarina (SC), Brazil. We evaluated 33,143 animals, representing 3,587 lots in 47 auctions from 2009 to 2014. The calves were classified according to genetic groups: British breed or crossbreed (BX); Continental breed or crossbreed (CX); Zebu breed or crossbreed (ZC); British and Continental crossbreed (BC); and Bos taurus and Bos indicus crossbreed (TI). The lots were composed of male and female calves. The years presenting low and high changes in the price of calves were similar to the variation in the price of beef cattle and, in 2014, the calf price reached its highest value (R$5.36). Male calves were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal production; Beef cattle; Genetic parameters; Marketing; Price.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016001000632
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Grb10 characterization in bovine cumulus oocyte complexes from different follicle sizes Ciência Rural
Rosa,Paulo Roberto Antunes da; Bohrer,Rodrigo Camponogara; Ludke,Charles Alencar; Cesaro,Matheus Pedroti De; Pereira,Gabriel Ribas; Mondadori,Rafael Gianela; Antoniazzi,Alfredo Quites; Gonçalves,Paulo Bayard Dias.
The objective of this study was to investigate the mRNA expression and protein localization of Grb10 gene in bovine cumulus-oocyte complexes (COCs) from different follicle sizes. Firstly, it was investigated the mRNA expression to correlate with maturation rates. COCs from follicles at 1-3, 4-6, 6-8 and >8mm were used to evaluate Grb10 gene expression by qRT-PCR assay and nuclear maturation rates. It was observed that more competent oocytes (from follicles at 6-8 and >8mm; P>0.05), had lower Grb10 mRNA expression levels when compared to the oocytes from follicles at 1-3 and 4-6mm (P>0.05). After it was performed an immunofluorescence analysis in COCs from different follicle sizes (1-3, 4-6, 6-8 and >8mm) to investigate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: : mRNA; Protein; Maturation; Oocyte; Grb10..
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000500898
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Heritability estimation and genetic correlations for mature weight, visual scores, and growth traits in Nellore cattle R. Bras. Zootec.
Koetz Junior,Celso; Roso,Vanerlei Mozaquatro; Fávaro,Patricia da Cruz; Pereira,Gabriel Ribas; Borges,Marcelo Henrique Favaro; Barca Junior,Flávio Antônio; Barcellos,Júlio Otávio Jardim; Ribeiro,Edson Luis de Azambuja.
ABSTRACT This study was intended to estimate the genetic associations between growth traits and visual scores with possible changes in mature weight (MW) in 397,900 Nellore animals. A bi-character analysis was performed to estimate the (co)variances and genetic parameters for MW, which comprises the following traits: conformation, finishing precocity, musculature at weaning (WC, WP, and WM) and yearling (YC, YP, and YM), birth weight (BW), weight from birth to weaning (WG), weight from weaning to yearling (YG), and final index (FIND). The observed mean MW was 417.6±56.2 kg, and the direct genetic effect mean estimated heritability ( h 2 a 1) of MW was 0.45. Overall, the BW was 31.0±3.7 kg, and the estimated h² was 0.34. The heritability estimate of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle; Growth parameters; Productive traits; Selection.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100301
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Reação de imunofluorescência indireta para detecção de anticorpos anti-Neospora caninum em amostras coletivas de leite Ciência Rural
Camillo,Giovana; Antonello,Ana Maria; Pereira,Gabriel Ribas; Gonçalves,Paulo Bayard Dias; Sangioni,Luís Antônio; Muller,Lilian; Vogel,Fernanda Silveira Flores.
O objetivo deste estudo foi determinar a presença de anticorpos anti-Neospora caninum em amostras coletivas de leite, através da reação de imunofluorescência indireta (RIFI). Para isso, foram coletadas amostras do leite dos tanques refrigerados de 36 rebanhos, das quais foram selecionadas 14 para coletas de amostras individuais de soro sanguíneo e de leite das vacas. Encontrou-se correlação em 12 dos 14 rebanhos selecionados para a amostragem individual dos animais, em comparação à detecção de anticorpos nas amostras coletivas de leite. Foi observada uma concordância de 76% comparando-se o resultado das amostras coletivas com os resultados individuais de leite. Observaram-se baixos títulos de anticorpos (50) no soro sanguíneo dos animais soropositivos,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: RIFI; Neosporose; Rebanhos leiteiros; Diagnóstico.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000900018
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Relationship of post-weaning growth and age at puberty in crossbred beef heifers R. Bras. Zootec.
Pereira,Gabriel Ribas; Barcellos,Júlio Otávio Jardim; Sessim,Amir Gil; Tarouco,Jaime Urdapilleta; Feijó,Fernanda Dornelles; Braccini Neto,José; Prates,Ênio Rosa; Canozzi,Maria Eugênia Andrighetto.
ABSTRACT This study was intended to evaluate body size structure and growth parameters of crossbred heifers fed at four nutritional levels to achieve puberty earlier. Animals were classified depending on their level of crossing between Nelore and Hereford and subjected to four nutritional levels (kg day−1) as follows: 0.5 (light; n = 32), 0.75 (medium; n = 32), 1.00 (high; n = 29), and 1.25 (very high; n = 27). Heifers at puberty and at weaning were individually classified for growth parameters. The fat thickness and longissimus muscle area throughout the experimental period were determined by ultrasonography. The height, heart girth, frame, and weight:height ratio were variables used to evaluate body traits. Univariate analysis of variance using the GLIM...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef heifers; Growth parameters; Nutrition diets; Productivity; Ultrasonography.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000500413
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Testicular arteries systematization based on different levels of scrotal configuration in caprines Ciência Rural
Almeida,Mônica Marco de; Assis Neto,Antônio Chaves de; Penno,Alexandra Klindline; Conde Júnior,Airton Mendes; Menezes,Danilo Jose Ayres de; Pereira,Gabriel Ribas; Azevêdo,Laurita Martins de; Carvalho,Maria Acelina Martins de.
The objective of this study was to describe the distribution of testicular arterial vessels in caprines with different degrees of scrotal division. Scrotal configurations were classified as follows; Group I: scrotum without bipartition; Group II: scrotum showing a ventral division until the middle of the testis; and, Group III: scrotal separation extended beyond the middle of the testis. A colored vinyl acetate solution was injected into 60 testicular arteries (30 pairs). After, the samples were submitted to corrosion cast method to obtain tubular vascular models for macroscopic analysis. We observed that the testicular arteries emerge from the abdominal aorta, cross the inguinal canal to become coiled and involved by the pampiniform plexus. Close to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Testicles; Testicular arteries; Scrotal configuration; Caprines.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000500016
Registros recuperados: 7
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