Semina: Ciências Agrárias最新文献

{"title":"Nutritional and metabolic parameters in lambs fed diets containing crude glycerine","authors":"M. A. Syperreck, E. L. T. Peixoto, Matheus Gabriel Maidana Capelari, Débora Dias de Carvalho, A. R. Poveda-Parra, Fernando Luiz Massaro Junior, O. P. Prado-Calixto, I.Y. Mizubuti","doi":"10.5433/1679-0359.2023v44n5p1715","DOIUrl":"https://doi.org/10.5433/1679-0359.2023v44n5p1715","url":null,"abstract":"The objective of this work was to evaluate the intake, apparent digestibility, nitrogen balance, ruminal and blood parameters in lambs fed diets containing of crude glycerin. Four castrated lambs of Santa Ines breed with an average weight of 25.0 kg were used. The evaluated diets contained four levels of crude glycerin (0.0, 50.0, 100.0 and 150.0 g kg DM-1). All diets were formulated to meet the nutrient requirements of growing and finishing lambs. The ingredients were: Brachiaria dyctioneura hay as roughage, ground corn grain, soybean meal, urea, mineral salt and crude glycerin. The complete diet provided to the animals was composed of 500 g kg-1 roughage and 500 g kg-1 concentrate on DM basis. A 4 x 4 Latin square experimental design was used. The highest intake (P<0.05) of dry matter (129.08 g kg BW-0.75), neutral detergent fiber (62.91 g kg BW-0.75), acid detergent fiber (41.10 g kg BW-0.75), total carbohydrate (99.92 g kg BW-0.75) and organic matter (116.89 g kg BW-0.75) was achieved with diets varying from 39.2 to 44.7 g kg DM-1 crude glycerin. Crude protein (17.84 g kg BW-0.75) and ether extract (2,70 g kg BW-0.75) intake was higher (P<0.05) with diets containing 39.0 and 77.1 g kg DM-1 of crude glycerin, respectively. Consumed and absorbed N displayed a quadratic effect, whereas retained N displayed a linear decreasing effect in function of crude glycerin levels. Ruminal concentrations of acetate, propionate, and butyrate, and blood glucose was influenced (P<0.05) by the postprandial hour vs. experimental diet interaction. Glycerin levels in the diet did not influence (P>0.05) the apparent digestibility and ruminal N-NH3, pH, ciliate protozoa and blood urea. Therefore, diets containing crude glycerin influenced dry matter intake, with the highest value being around 40 g kg DM-1. Likewise, diets containing crude glycerin influenced the N consumed and absorbed with maximum crude glycerin points of 36.9 and 28.4 g kg DM-1.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139282598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correlações entre características de ordenhabilidade e comportamento de vacas ordenhadas em sistemas robotizados","authors":"Flor Angela Niño Rodriguez, M. Lopes, A. L. R. Lima, Gercílio Alves de Almeida Júnior, André Luiz Monteiro Novo, Matteo Barbari, Sergio Corrêa Brito, Leandro Carvalho Bassotto, A. C. D. Camargo, Esteffany Francisca Reis Nascimento","doi":"10.5433/1679-0359.2023v44n5p1683","DOIUrl":"https://doi.org/10.5433/1679-0359.2023v44n5p1683","url":null,"abstract":"Objetivou-se analisar a correlação entre características de ordenhabilidade e de comportamento de vacas ordenhadas em sistemas de ordenha automáticas. Os dados coletados, foram referentes ao período de setembro de 2019 a março de 2020, oriundos de dois rebanhos leiteiros comerciais localizados no Estado de Minas Gerais, nos quais utilizam sistema de ordenha automática (AMSTM, DeLaval, Tumba, Suécia), contêm 68.896 observações, de 542 vacas primíparas e multíparas da raça Holstein e mestiças (Holstein x Jersey). Os registros diários de características de ordenhabilidade como fluxo do leite (FL), tempo no box (TB) e eficiência na ordenha (EO); bem como características de comportamento: handling time na ordenha (HT), ordenhas incompletas (OIN) e coices (COI) foram avaliadas por análise de correlação bivariada pelo coeficiente de correlação de Pearson, utilizando-se o programa estatístico SPSS versão 22. As correlações foram negativas moderadas entre FL e TB; EO e HT; bem como TB e EO; e positiva e alta entre FL e EO. Correlação positiva e alta foi encontrada entre TB e HT; positiva e moderada entre EO e PL e positiva baixa entre HT e OIN (P<0.01). Não houve correlação entre a frequência de ordenha (FO) com COI e OIN.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139286565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aplicação foliar de prolina na mitigação do estrese salino nos índices fisiológicos de maracujazeiro-azedo","authors":"Larissa Fernanda Souza Santos, G. S. D. Lima, V. Lima, André Alisson Rodrigues da Silva, L. A. D. Soares, Jackson Silva Nóbrega, J. D. Capitulino, Lucyelly Dâmela Araúj O Borborema, A. R. Souza, Edmilson Junior Medeiros Caetano","doi":"10.5433/1679-0359.2023v44n5p1637","DOIUrl":"https://doi.org/10.5433/1679-0359.2023v44n5p1637","url":null,"abstract":"A salinidade é um dos principais estresses abióticos que restringe o crescimento das plantas e causa perdas significativas no rendimento. Os efeitos do estresse salino são mais severos em regiões semiáridas, devido as condições climáticas e a ocorrência de fontes hídricas com teores elevados de sais.  Neste contexto, a busca por estratégias que viabilizem o uso de águas salinas na irrigação é fundamental para garantir a necessidade de produção de alimentos. Assim, objetivou-se com este estudo avaliar os efeitos das aplicações foliar de concentrações de prolina nos índices fisiológicos de maracujazeiro-azedo irrigados com águas salinas na fase de formação de mudas. A pesquisa foi conduzida em casa de vegetação pertencente à Unidade Acadêmica de Engenharia Agrícola da Universidade Federal de Campina Grande, em Campina Grande – PB, utilizando-se o delineamento experimental inteiramente casualizado, em esquema fatorial 5 × 4, sendo cinco níveis de condutividade elétrica da água de irrigação CEa - (0,6; 1,2; 1,8; 2,4 e 3,0 dS m-1) e quatro concentrações de prolina (0, 5, 10 e 15 mM) com quatro repetições e cada parcela continha duas plantas, totalizando 160 unidades experimentais. A salinidade da água a partir de 0,6 dS m-1 reduziu o conteúdo relativo de água, trocas gasosas, e elevou o extravasamento de eletrólitos no limbo foliar das plantas de maracujazeiro-azedo. A irrigação com água de condutividade elétrica entre 1,3 e 1,8 dS m-1 estimulou a biossíntese de pigmentos fotossintéticos do maracujazeiro-azedo ‘BRS GA1’, aos 66 dias após a semeadura. A aplicação foliar de prolina nas concentrações variando de 4,5 e 6,5 mM aumentou a condutância estomática, a transpiração, a taxa de assimilação de CO2, a eficiência instantânea de carboxilação e os teores de clorofilas do maracujazeiro-azedo.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139288435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Whitefly distribution and interaction with endosymbionts in the state of Paraná","authors":"Juarez Pires Tomaz, João Vitor Liachi Cobianchi, Luíza Sales Lima, Luciano Mendes de Oliveira, A. T. Hoshino, H. G. Androcioli","doi":"10.5433/1679-0359.2023v44n5p1661","DOIUrl":"https://doi.org/10.5433/1679-0359.2023v44n5p1661","url":null,"abstract":"Whiteflies comprise a complex of cryptic species that are genetically distinct but morphologically indistinguishable. Among them, Bemisia tabaci and Trialeurodes vaporariorum (Tvap) are the most prominent species causing agricultural damage. In Brazil, three B. tabaci species have been identified: New World (NW), Middle East-Asia Minor (MEAM1), and Mediterranean (MED). Whiteflies establish symbiotic associations with endosymbiotic bacteria, conferring adaptive advantages to the insects. The objective of this study was to identify whitefly species in municipalities of the state of Paraná and investigate their interactions with endosymbiotic bacteria. Insects were collected in 14 municipalities across different edaphoclimatic regions of Paraná, either in agricultural crops or on weeds. Molecular analyses, based on previously published PCR-based methods, were used to identify the insects and their respective endosymbionts. The results revealed that B. tabaci MEAM1, MED, NW, and Tvap accounted for 39.8%, 27.0%, 6.3%, and 23.7% of the collected specimens, respectively. These insects exhibited interactions with endosymbiont genera such as Portiera, Arsenophonus, Rickettsia, Hamiltonella, and Wolbachia, either in isolation or through co-infection. In some instances, interactions with up to five endosymbionts were observed in specific locations. The occurrence of Tvap in open fields and the prevalence of MED, particularly in the southeast of the state, where temperatures are milder, along with their interactions with endosymbionts providing adaptive advantages to the insects, raise significant phytosanitary concerns for the agricultural security of Paraná.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139287981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deoxynivalenol induces ovarian apoptosis in peripubertal rats","authors":"J. Gerez, Gisele Augusta Amorim de Lemos, Thaynara Camacho, V. H. Marutani, L. Chuffa, Henrique Spaulonci Silveira, W. A. Verri, Eduardo Micotti da Gloria, Ana Paula Frederico Rodrigues Loureiro Bracarence","doi":"10.5433/1679-0359.2023v44n5p1621","DOIUrl":"https://doi.org/10.5433/1679-0359.2023v44n5p1621","url":null,"abstract":"Puberty, governed by the endocrine system, marks the onset of reproductive functions in animals and humans through a series of physiological and biological transformations. Although the mycotoxin DON can disrupt hormonal balance and cause reproductive abnormalities, its impact on puberty-associated reproductive changes remains understudied. Considering the increased exposure of children and adolescents to DON, our study aimed to elucidate its influence on follicular integrity and the expression of pro-apoptotic proteins (BAX and Caspase-3) and anti-apoptotic protein (BCL-2) in juvenile rat ovarian tissue. We divided ten 28-day-old prepubertal Wistar rats into two dietary groups for 28 days: a control group with a mycotoxin-free diet and a DON group with a diet containing 10 mg DON/Kg. After the experiment, ovaries and uterus weights were recorded, and the ovaries underwent morphometric and immunohistochemical analysis. DON exposure led to significant reductions in both ovarian and uterine weights. Although DON intake did not change the number of ovarian follicles across developmental stages, we observed an increased expression of BAX and Caspase-3 and a decreased BCL-2 expression in most follicular stages and corpora lutea. In summary, DON exposure during puberty can interfere with apoptotic processes in diverse ovarian cell populations during early adulthood.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139288593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parasitismo de Atta sexdens Forel, 1908 (Hymenoptera: Formicidae) por forídeos (Diptera: Phoridae) em Londrina-PR","authors":"Julio Cesar Almeida, Adriano Thibes Hoshino, T. P. L. Pereira, Amarildo Pasini","doi":"10.5433/1679-0359.2023v44n5p1603","DOIUrl":"https://doi.org/10.5433/1679-0359.2023v44n5p1603","url":null,"abstract":"As formigas-cortadeiras do gênero Atta são consideradas engenheiras de ecossistemas e fundamentais para o ambiente, por outro lado, são também prejudiciais aos sistemas produtivos pela severa desfolha que ocasionam em diversas espécies vegetais. Diversas moscas da família Phoridae são parasitóides de insetos sociais, e atuam no controle biológico das cortadeiras. O estudo objetivou verificar a ocorrência e riqueza de parasitóides que incidem sobre a saúva-limão, A. sexdens, em Londrina-PR, além de registrar a taxa de parasitismo e algumas características comportamentais e biológicas das espécies. Entre junho/2019 e maio/2020 coletas de formigas-operárias e forídeos associados às mesmas foram realizadas, em ninhos previamente selecionados, no Campus da Universidade Estadual de Londrina e na mata nativa do Jardim Botânico, em Londrina, PR. Os forídeos coletados foram preservados em álcool 70%, para posterior identificação das espécies e as saúvas foram mantidas em laboratório, para a verificação do parasitismo, conforme descrições na literatura. Formigas coletadas foram frequentemente inspecionadas, e uma vez constatada a sua morte, foram individualizadas em tubos plásticos. Foram capturados, nos dois ambientes, 216 forídeos adultos, sendo identificadas as seguintes espécies parasitóides: Apocephalus attophilus, Eibesfeldtphora declinata, Eibesfeldtphora elongata, Eibesfeldtphora tonhascai e Myrmosicarius grandicornis, sendo este último, predominante pelo método de coleta de parasitóides adultos ‘CPA’. Das saúvas coletadas, apenas 1,28% estavam parasitadas, sendo A. attophilus a espécie emergida mais abundante e ciclo reduzido de desenvolvimento. As taxas de parasitismo mantiveram-se abaixo dos 2% ao longo do ano, com maior taxa em setembro (1,81%). A ampliação da distribuição geográfica destas moscas para o Paraná contribui com relevantes informações sobre as características biológicas/comportamentais de algumas espécies parasitóides e a interferência que provocam nas atividades dos ninhos, ressaltando-se a importância destas como potenciais agentes de controle biológico da saúva-limão, em programas de manejo integrado.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139302582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Economic feasibility of implementing an infrastructure for collecting rainwater from the roof of free-stall sheds","authors":"Fabiana Alves Demeu, M. A. Lopes, J. Palhares, A. Lima, Francisva lde Melo Carvalho, Marcos Aurélio Lopes Filho, Andréia Alves Demeu, Douglas Alves Vidal, Marina de Luca Lima, M. Barbari","doi":"10.5433/1679-0359.2021V42N2P877","DOIUrl":"https://doi.org/10.5433/1679-0359.2021V42N2P877","url":null,"abstract":"his study aimed to analyze the economic feasibility of implementing and using the necessary infrastructure to collect rainwater from the roof of free-stall sheds in a dairy production system in southern Minas Gerais, Brazil. Specifically, the total cost (TC), total operating cost (TOC), and actual operating cost (AOC) of a cubic meter of rainwater and the break-even point in cubic meters were estimated. The research was conducted from January to December 2017 on a property located in the south of Minas Gerais. The following MOP scenarios were analyzed: most likely (Scenario 1), optimistic (scenario 2), and pessimistic (scenario 3). The grant value of the Das Velhas River basin was considered for the most likely scenario, as it has the most similar value with that of the basin surrounding the Furnas reservoir, in which the property is inserted. The grant value for water collection and consumption from the Paraíba River basin was considered in Scenario 2, as this Federal basin has the lowest grant value. The grant value for water collection and consumption from the Piracicaba, Jundiaí, and Capivari river basins was considered in Scenario 3, as these basins have the highest prices for the cubic meter of the collected and consumed water. The implementation of the infrastructure for collecting rainwater from the roof of free-stall sheds under the studied conditions was economically unfeasible for all scenarios, with negative net present values (NPV). Simple and discounted paybacks were longer than the proposed horizon. The internal rate of return (IRR) could not be estimated due to the negative values of the net cash flow. The benefit-cost ratios (BCR) were unsatisfactory (lower than 1). The TC values for rainwater collection from the roof of free-stall sheds were R$ 23,206.59 and R$ 20,489.25 for scenarios with interest rates of 8.50 and 6.99%, respectively, while the TOC value was R$ 7,850.30 for all analyzed scenarios. The unit values for TOC and AOC were R$ 9.9024/m3 and R$ 1.3060/m3 of collected water, respectively. The break-even point could not be estimated in the studied scenarios, as the variable cost per cubic meter of water collected from the roof of the free-stall shed was higher than the grant value charged by the water management committees of the different studied basins.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86091315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compostagem de efluente suíno no tratamento de resíduos de fármacos veterinários","authors":"Robson Evaldo Gehlen Bohrer, E. Carissimi, D. A. R. Lopez, Delmira Beatriz Wolff, Danni Maísa da Silva, O. D. Prestes","doi":"10.5433/1679-0359.2019v40n6p2813","DOIUrl":"https://doi.org/10.5433/1679-0359.2019v40n6p2813","url":null,"abstract":"The increasing need for animal protein has exerted pressures on the current animal production system. One of the alternatives found by producers to improve animal performance has been the use of veterinary drugs, especially antibiotics. However, its indiscriminate use can be a risk to the environmental balance of the producing locations since Brazil has approximately 42 million pigs. With this herd, pig farming represents a great potential for generating environmental impacts. As an alternative use of the large volume of liquid pig manure generated, many producers have been using this slurry in the soil as a bio fertilizer. Residues of veterinary drugs are capable of accumulation with environmental matrices and leach into water resources. In this sense, it is mandatory to dedicate more efforts on the study of techniques and processes for the treatment of organic effluents contaminated by veterinary drugs. Low-cost and environmentally friendly alternative treatment systems are necessary, in order to minimize the entry of these contaminants into the environment. Therefore, the composting process, defined as aerobic microbial decomposition process of organic matter, can be an alternative for treating the effluents contaminated by veterinary drugs. This review to aims to create awareness in the academic community regarding the veterinary drug residues and their contamination potential in different environmental matrices, as well as evaluating the composting process as a technique to minimize the impacts of the swine activity waste on the environment.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85186321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Caracterização espacial e identificação de abrigos de quirópteros e sua relação com os casos de raiva em animais de produção no semiárido, Brasil, de 2007 a 2015","authors":"A. Leite, Denize Monteiro dos Anjos, E. M. Simões, José Romero Alexandre Alves, A. Gomes, Inácio José Clemetino, S. S. Azevedo, C. J. Alves","doi":"10.5433/1679-0359.2018v39n6p2875","DOIUrl":"https://doi.org/10.5433/1679-0359.2018v39n6p2875","url":null,"abstract":"The rabies virus propagates through several epidemiological cycles, which makes it difficult to control and predict. Thus, this study was structured with the aim of establishing the geospatial characterization of bat shelters in different semi-arid mesoregions of the state of Paraíba, Northeastern region of Brazil. Data provided by the Secretaria de Estado do Desenvolvimento da Agropecuária e da Pesca da Paraíba (SEDAP-PB), from 2007 to 2015 and data from digital platforms were used. The geographic representation was produced using the software QGIS 2.16.0 - Nodebo. To verify virus circulation sites, buffers were plotted within a 10-km radius from the registered shelters and rabies incidence sites in the state. A registry of 93 shelters in the period between 2007 and 2015 were distributed in 22 municipalities and 15 microregions. All mesoregions were represented, though 47.31% of the bat shelters were located in Agreste Paraibano. Of the total registered shelters, 66 (71%) are classified as artificial, and 27 (29%) as natural. The underreporting of rabies occurrences reveals the need to improve the registration of hematophagous bat shelters, specifically those for the D. rotundus species.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80802626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Frequência de suplementação proteico-energética sobre o desempenho e comportamento ingestivo de bezerros Nelore mantidos em pastagem tropical na estação seca","authors":"G. L. Franco, Marcelo Vedovatto, Marcella Cândia D'Oliveira, I.M. Cortada Neto, M. G. Morais, J. M. D. S. Diogo","doi":"10.5433/1679-0359.2018v39n6p2555","DOIUrl":"https://doi.org/10.5433/1679-0359.2018v39n6p2555","url":null,"abstract":"With the objective to evaluate different frequencies of supplementation on the performance and ingestive behavior of Nellore calves kept on Urochloa brizantha cv. Marandu pasture, 56 animals with initial average body weight (BW) of 174.5 kg were submitted to the following treatments: no supplement and 1x, 3x, and 7x supplementation per week. The supplement was provided in the amount of 3.5 g kg-1 of BW day-1. BW and evaluation of behavior were assessed every 28 days. The randomized block's design with two repetitions was used. The analyses of variance were carried out by the GLM procedure in the SAS software, and the means were compared by the Tukey’s test at 5% significance. The supplementation increased the average daily gain (ADG; P ? 0.05); however, it did not differ between frequencies (0.005, 0.190, 0.183, and 0.177 kg head-1 day for the no supplement treatment and 1x, 3x, and 7x per week, respectively). The animals in the no supplement treatment showed longer grazing time (P ? 0.05) compared to those receiving the supplement. However, results did not differ between frequencies (10.44, 8.57, 8.32, and 8.59 hours day-1 for no supplement treatments and 1x, 3x, and 7x per week, respectively). Thus, the frequency of supplementation can be reduced to once a week without reducing animal performance.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77428343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}