Influence of seasonality on helminthiasis and performance of Nellore steers kept in silvopastoral system Influência da sazonalidade na helmintose e desempenho de novilhos Nelore mantidos em sistema silvipastoril

This observational study verified the effects of monochromatic lighting for three monochromatic light spectra on the production and quality of laying hen eggs and blood parameters, as probable indicators of environmental stress. Lohmann®29-week-old birds were divided into groups of 20 animals, housed in three experimental houses with different lighting treatments (blue, green and red), and monitored for 90 days. Were analysed 4,443 eggs, and the values of the following measurements were extracted: egg weight (g), albumen height (mm), shell resistance (kgf/cm²), shell thickness (mm), Haugh unit, specific gravity (g/cm³), and egg shape. Blood samples were collected from the birds at the beginning and at the end of the study period. The levels of total plasma protein and the heterophile/lymphocyte ratio remained within the normal range. Laying hens housed under blue and red lighting had higher egg production (per hen) and showed better egg quality results. Red lighting stood out for providing significantly better shell resistance than other treatments. Glucose differed between treatments, with a drop in blood glucose levels as the environment light wavelength increased. The quality of the eggs was affected differently by the sources of monochromatic lighting. Correct lighting management promotes better health for birds and increased egg production and quality.

RESUMOO carrapato Rhipicephalus (Boophilus) microplusé um dos principais agentes transmissores de enfermidades na bovinocultura. A busca de alternativas no controle cresce com o uso de Brazilian Journal of Development Braz. J. of Develop., Curitiba, v. 5, n. 11, p23724-23736 nov. 2019 ISSN 2525-8761 23725 extratos botânicos, já que o controle químico têm apresentado problemas com resistência. Dessa forma, o objetivo foi avaliar o efeito do extrato vegetaletanólico de Tingui -Magoniapubescense suas fases hexânica e hidormetanólica na concentração de 1% como carrapaticida para controle do carrapato bovinoe a toxicidade do solvente dimetilsulfóxido (DMSO) nas concentrações 1, 2, 5 e 10%. Os testes foram realizados com imersão de fêmeas ingurgitadas na solução acaricida e um grupo controle em água destilada. Verificou-se uma redução no número de larvas eclodidas com solvente a 5%. Nafase hidrometanólica em relação ao peso dos ovos e peso da teleógina, não foi observado efeito significativo. Os extratos de Magoniapubescensnas duas fases apresentaram probabilidade de ocorrência de mortes, sendo a hexânica com 16,9% e a hidrometanólica com 37,39%, não apresentando diferença estatística entre elas.Palavras-chave: Acaricida. Carrapato. Resistência. Plantas Inseticidas. ABSTRACTThe tick Rhipicephalus (Boophilus) microplus is one of the main disease transmitting agents in cattle breeding. The search for alternatives in control grows with the use of botanical extracts, as chemical control has presented problems with resistance. Thus, the objective was to evaluate the effect of Tingui -Magoniapubescense plantethanolic extract its hexanic and hidormethanolic phases at 1% concentration as a tick to control bovine tick and the toxicity of dimethylsulfoxide solvent (DMSO) at concentrations 1, 2, 5 and 10. %. The tests were performed with immersion of engorged females in acaricide solution and a control group in distilled water. There was a reduction in the number of larvae hatched with 5% solvent. In the hydromethanolic phase in relation to egg weight and teleogen weight, no significant effect was observed. Magoniapubescens extracts in the two phases presented a probability of death, hexane with 16.9% and hydromethanolic with 37.39%, showing no statistical difference between them.

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