Luiz Gustavo de Pellegrini

Efeito do óleo de eucalipto (Corymbia citriodora) no controle do carrapato bovino

This research was aimed at evaluating in vitro and in vivo effects of eucalyptus (Corymbia citriodora) oil on cattle ticks (Rhipicephalus (Boophilus) microplus). Negative control group and eight concentrations of eucalyptus oil (0.5; 1; 2; 5; 10; 20; 50; 100%), were used on in vitro trials with engorged female ticks. The efficacy of control ticks was 0; 30.5; 75.5; 91; 100; 100; 100; 100 and 100%, respectively. At the in vivo trial eighteen Holstein cows were allocated to three groups (negative control, eucalyptus oil at 3.5% - level estimated by regression analysis, accounting for 95% efficacy of control ticks on in vitro trial and amitraz at 0.025%). Engorged female ticks were counted before (mean of days -3, -2, -1) and after treatment (1, 2, 3, 5, 7, 10, 14, 21 days). The efficacy control tick was 0; 96.4 and 69%, respectively, at 21 days after treatment. On the 1st and 2nd milked after treatments, physiologic variables were evaluate and milk samples were collected to evaluate organoleptic properties in milk and yoghurt (negative control x phytotherapic treatment). Similar results were found with sensorial acceptance test of milk and physiologic variables.

COMPARAÇÃO DE DIFERENTES MÉTODOS ANALÍTICOS PARA QUANTIFICAÇÃO DE LIPÍDIOS EM CREME DE RICOTA

The complexity of each sample makes impossible to describe only one method of analysis as the best, therefore, we should consider the advantages and disadvantages of each method and relate it with the sample. The aim of this study was identify the best method for lipids quantification in ricotta cream with a comparative study of three physico-chemical methods of analysis for lipids. The methods used were Soxhelt (hot extraction, using ether as solvent), Bligh; Dyer (cold extraction with chloroform, methanol and water) and Gerber (acid hydrolysis, using sulfuric acid and isoamyl alcohol). We evaluated the method in this study, among those mentioned, which would provide greater efficiency and reproducibility. The method of Gerber had the lowest performance among the methods tested, although not statistically differ from the Soxhlet method, the reproducibility of Gerber detract this type of method. The Soxhlet method showed better reproducibility of results, and values closer to those pre-determined for this sample. Bligh; Dyer method showed the highest yield of the lipid content of the sample, so the hot extraction methods (Soxhlet) and cold (Bligh; Dyer) are those that best show the lipid content of ricotta cream analyzed.

Physicochemical, technological and sensory properties of hamburger made with meat from lambs fed on whole cottonseed

The physicochemical composition and the technological and sensory properties of hamburgers made with meat from Ile de France lambs fed on different levels (0, 10, 20, 30 and 40%) of whole cottonseed were studied. The addition of whole cottonseed to the lambs’ diets decreased the thiobarbituric acid reactive substances in the lamb meat and altered the physicochemical characteristics of the hamburgers, which were characterised by low lipid (

Physico-chemical characterization of frozen sheep meat for a predetermined period

\hat{y} = 4.27

EFEITO DO TEMPO DE ARMAZENAMENTO SOB AS CARACTERÍSTICAS FÍSICO-QUÍMICAS DA CARNE OVINA

y^=4.27), cholesterol (

QUANTIFICAÇÃO DE GORDURA NO LEITE OVINO: ESTUDO COMPARATIVO DOS RESULTADOS OBTIDOS POR METODOLOGIA OFICIAL E POR EQUIPAMENTOS ELETRÔNICO

\hat{y} = 75.15