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The objective of this work was to explain the cause and effect estimates on corn yield as a function of planting speed. The study was conducted from January 21 to June 15, 2019, at Fazenda Invernadinha, rural area of ​​the municipality of Mineiros, GO, Brazil. The experimental design consisted of randomized blocks, corresponding to five tractor planting velocities (4, 6, 8, 10 and 12 km h-1), in 4 replicates, where each plot consisted of 8 300 m long lines spaced at each 0.9 m, for a population of 60.000 plants ha-1. Sowing was carried out in no-till system after soybean harvest. A John Deere tractor and planter assembly were used, models 7715 (182 hp horsepower) and 2115 CCS Vacumeter (8 rows of 0.9 m respectively) with 30-hole 30 mm seed discs. Data were submitted to the assumptions of the statistical model, verifying the normality and homogeneity of the residual variances, as well as the additivity of the model. The analyzes were performed in the Rbio R interface, besides the Genes Software. It was concluded that the plant population is the variable that most influences the cause and effect estimates on corn yield. For high corn yields it is recommended that the tractor planting speed be adjusted to 6 km h-1.

Brazil has the largest commercial cattle herd in the world. With the growing export demand, comes concern about the harmlessness of commercialized meat, as numerous pathogens are transmitted by food, this study aimed to analyze the occurrence of beef contamination by Salmonella sp and other bacteria of the Enterobacteriacea family in minced beef sold in butchers at Mineiros City, Goiás. Twenty randomly acquired samples were analyzed from 20 commercial establishments in the municipality. The samples were submitted to conventional bacterial research for detection of Salmonella sp and other bacteria indicators of sanitary quality. In addition, eight criteria recommended by Good Manufacturing Practices in establishments were observed. The results of microbiological analysis revealed that five samples were contaminated by E. coli; four samples by Pseudomonas sp., eight by Citrobacter sp., and one sample was contaminated by Salmonella sp. In the verification of hygienic-sanitary conditions, it was detected that in most establishments, the manipulators did not use caps, gloves, apron, as well as the hand washing procedure. In addition, the use of white uniforms was verified in 10 establishments (50%); the adequacies related to the presence of refrigerated or ventilated environment; floor, wall, and exhibitors cleaning; were detected in most establishments. It was identified the occurrence of Salmonella sp., and other bacteria of the Enterobacteriacea family, in samples of minced beef meat sold in Mineiros, Goiás. Therefore, it can be inferred that the non-proper application of GMP may have contributed to the occurrence of contamination in the samples.

Detecção e identificação de Eimeria sp em galinhas caipiras produzidas no município de Mineiros, Goiás Detection and identification of Eimeria sp in free-range chickens produced in Mineiros county, Goiás

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