Integração lavoura-pecuária-floresta. 3. Escolha dos animais e formação de lotes.

O cultivo de forrageiras em sucessão ou em consórcio com culturas anuais em áreas agrícolas é uma prática que tem crescido nos últimos anos. Esta prática visa à cobertura do solo e à melhoria do ambiente para produção de grãos. Em algumas situações estas forrageiras têm causado problemas devido ao excesso de produção, ao não serem pastejadas. Utilizam esta prática os agricultores que têm obtido grande disponibilidade de forragem durante a estação seca, época em que falta pasto para os pecuaristas tradicionais. Isto representa uma oportunidade para os agricultores diversificarem sua atividade, com recria e engorda de gado, em sistema de integração lavoura-pecuária. Embora por falta de conhecimento sobre o assunto, esses agricultores têm encontrado dificuldades para a escolha do gado no momento da compra. Alguns conhecimentos zootécnicos relacionados à aparência dos animais, tais com sexo, raça, tipo, idade e desenvolvimento, qualidade zootécnica, estado sanitário, entre outros, permitem aos agricultores a identificação no campo dos animais com características mais adequadas ao seu sistema de produção. Em decorrência da boa qualidade e disponibilidade das pastagens produzidas nas áreas de lavoura esses agricultores podem produzir animais para mercados mais exigentes, que pagam melhor por um produto de qualidade superior. Para este sistema são necessários animais com bom potencial genético, que ainda jovens possam estar com peso e acabamento requerido pelos frigoríficos.bitstream/item/58731/1/DOC2011112.pd

Escolha de animais e formação de lotes de bovinos para sistemas de integração.

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Sistema de gestão de publicações: manual do usuário.

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Estratégias de sucessão trigo/aveia preta-soja para sistemas de produção de grãos no Planalto Médio do Rio Grande do Sul.

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Differential defense responses of tropical grasses to Mahanarva spectabilis (Hemiptera: Cercopidae) infestation.

The spittlebugs Mahanarva spectabilis economically challenges cattle production of neotropical regions, due to its voracious feeding on tropical grasses. Here, we evaluated biochemical responses of the interaction between M. spectabilis and the widely cultivated tropical grasses Brachiaria spp. (i.e., brizantha and decumbens) and elephant grasses (cvs. Roxo de Botucatu and Pioneiro), regarding lipoxygenases, protease inhibitors, phytohormones, and proteolytic activities in the midgut of M. spectabilis. The M. spectabilis-infested grasses increased lipoxygenases activity, except for cv. Pioneiro. The levels of the phytohormones jasmonic and abscisic acids were similarly low in all genotypes and increased under herbivory. Furthermore, salicylic acid concentration was constitutively higher in Brachiaria sp., increasing only in spittlebug-infested B. decumbens. M. spectabilis infestations did not induce increases of protease inhibitors in any forage grass type. The trypsin activity remained unaltered, and the total proteolytic activity increased only in B decumbens-fed insects. Our findings revealed that most forage grasses exposed to spittlebugs activate the lipoxygenases pathway, resulting in increased abscisic and jasmonic acids. However, greater amounts of these hormones do not induce protease inhibitory activity in response to spittlebug attack. This knowledge certainly helps to guide future projects aiming at reducing the impact of spittlebugs on forage production

Search for New Physics with Jets and Missing Transverse Momentum in pp collisions at sqrt(s) = 7 TeV

A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum, using a data sample corresponding to an integrated luminosity of 36 inverse picobarns collected in proton--proton collisions at sqrt(s)=7 TeV with the CMS detector at the LHC. No excess of events is observed above the expected standard model backgrounds, which are all estimated from the data. Exclusion limits are presented for the constrained minimal supersymmetric extension of the standard model. Cross section limits are also presented using simplified models with new particles decaying to an undetected particle and one or two jets

Combined search for the quarks of a sequential fourth generation

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions.Comment: Replaced with published version. Added journal reference and DO

Search for anomalous t t-bar production in the highly-boosted all-hadronic final state

A search is presented for a massive particle, generically referred to as a Z', decaying into a t t-bar pair. The search focuses on Z' resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 inverse femtobarns. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z' modeled for several widths, as well as for a Randall--Sundrum Kaluza--Klein gluon. In addition, the results constrain any enhancement in t t-bar production beyond expectations of the standard model for t t-bar invariant masses larger than 1 TeV.Comment: Submitted to the Journal of High Energy Physics; this version includes a minor typo correction that will be submitted as an erratu