Avaliação de sêmen congelado de bovinos. Provas lenta e rápida de termo-resistência: efeitos sobre a fertilidade.

O objetivo do presente trabalho foi avaliar a eficiência de sêmen congelado, submetido as provas rápida e lenta de termo-resistência, sobre a fertilidade de fêmeas da espécie bovina

Phenolic compounds and organic acids evaluation on red grapes used for winemaking in the Northeast of Brazil.

Monitoring maturation to determine harvest time is very important to determine the enological potential and the quality characteristics and typicality of the wines (Borghezan et al., 2011). Considering that there is no cold weather in the São Francisco Valley, it is possible to scale and production of two harvests per year. This study aimed to determine the chemical composition of the ?Syrah? and ?Tempranillo? grapes, during maturation. Sixty plants were used for each cultivar, divided into three blocks

Perfil de ácidos graxos no Longissimus dorsi de ovinos Santa Inês em crescimento alimentados com diferentes níveis de energia metabolizável.

O presente estudo objetivou avaliar a influência de rações com diferentes níveis de energia metabolizável sobre o perfil de ácidos graxos no músculo longissimus dorsi de cordeiros Santa Inês. Foram utilizados 20 cordeiros, com idade e peso de 50 dias e 13,0 ± 0,56 kg, respectivamente, alimentados com rações contendo diferentes níveis energéticos: 2,08; 2,28; 2,47 e 2,69 Mcal/kgMS. A duração do experimento foi definida pelo tempo necessário para que a média do peso de todos os animais de cada tratamento alcançasse 28 kg, ocasião em que os mesmos foram abatidos. Após o abate, para a análise do perfil de ácidos graxos foi retirada da meia carcaça esquerda, uma amostra do músculo longissimus dorsi compreendida entre a 12ª e 13ª costelas. Para a análise do perfil de ácidos graxos foi utilizado cromatógrafo a gás Shimadzu GC 2010. As rações influenciaram os ácidos graxos cis,10-heptadecanóico e eicosanotrienóico (P<0,05), não influenciando os demais ácidos graxos encontrados. Os ácidos palmítico (C16:0) e esteárico (C18:0) contribuíram mais intensamente nos valores totais de ácidos graxos saturados. Os ácidos graxos C16:0; C16:1; C18:0; C18:1 e C18:2, constituíram mais 90% das áreas totais do cromatograma. Os níveis de energia dietéticos influenciam o teor do ácidos graxo saturado cis 10-heptadecanóico, bem como do ácido graxo poliinsaturado eicosatrienóico no músculo longissimus dorsi de cordeiros da raça Santa Inês. [Profile of fatty acids in Longissimus dorsi of growing Santa Inês sheep fed with different energy levels]. Abstract: his study evaluated the influence of diets with different metabolizable energy levels on the fatty acid profile of longissimus dorsi muscle of Santa Ines lambs. We used 20 lambs, age and weight at 50 days and 13.0 ± 0.56 kg, respectively, fed diets with different energy levels: 2.08, 2.28, 2.47 and 2.69 Mcal/kgDM. The duration of the experiment was defined by the time it takes for the average weight of all animals in each treatment reached 28 kg, at which time they were slaughtered. After slaughter, to analyze the fatty acid profile was removed from the left half carcass, a sample of the longissimus dorsi between the 12th and 13th ribs. To analyze the fatty acid profile was used a gas chromatograph Shimadzu GC 2010. The diets influenced fatty acids and cis,10-heptadecanoic eicosanotrienóico (P <0.05), not to influence the other fatty acids found. The palmitic acid (C16:0) and stearic (C18:0) contributed more strongly in the values of total saturated fatty acids. The fatty acid C16:0, C16:1, C18: 0, C18:1 and C18:2, constituted over 90% of the total area of chromatogram. The levels of dietary energy influence the content of saturated fatty acids cis 10-heptadecanoic and polyunsaturated fatty acid eicosatrienóico in the longissimus dorsi of Santa Ines lambs

Effect of leguminous lectins on the growth of Rhizobium tropici CIAT899.

201

Estimates of genetic parameters, growth curve, and environmental effects for Nellore cattle in the Pantanal.

ABSTRACT:The objective was to estimate the growth curves and genetic parameters using random regression methodology for Nellore cattle raised in Pantanal, MS, Brazil (6974 calves; n = 53,233 weights), with at least four weighings per individual. The model considered direct and maternal genetic additives and maternal permanent environmental effects at random. Orthogonal Legendre polynomials of cubic order were used to fit the growth curve. Analyses of variance were performed using the GLM procedure. The model used contained the fixed effects of sex, year of birth, farm, and the covariates calf birth month (linear and quadratic) and cow age at calving (linear and quadratic). The adjusted mean weight at 120 days of age was 93.43 ± 19.78 kg, and for 205 days of age, it was 180.42 ± 26.58 kg. Animals born in the dry season had a higher average weight [kg] (219.57 vs. 211.78, 3.7% higher) and, consequently, had higher weights at 646 days of age. Estimates of direct heritabilities (h2a) ranged from 0.35 to 0.75 (high magnitudes), and maternal heritabilities (h2m) along the trajectory of low magnitudes ranged from 0.03 to 0.08, respectively. The use of random regression to evaluate beef animals allows for adjusting the growth curve and selecting the best animals to be the parents of future generations. RESUMO: O estudo teve como objetivo estimar curvas de crescimento e parâmetros genéticos para Nelore bovinos usando uma metodologia de regressão aleatória. O conjunto de dados incluiu 6.974 bezerros criados no Pantanal, MS, Brasil, e 53.233 registros de peso, com pelo menos quatro pesagens por indivíduo. Os pesos médios aos 120 e 205 dias foram 93,43 kg e 180,42 kg, respectivamente. Os animais nascidos na estação seca tiveram pesos médios mais elevados, levando a pesos mais elevados aos 646 dias. As herdabilidades diretas variaram de 0,35 para 0,75, enquanto as herdabilidades maternas eram baixas (0,03 a 0,08). A regressão aleatória ajusta efetivamente curvas de crescimento e auxilia na seleção de animais superiores para reprodução

Magnetic susceptibility of EuTe/PbTe Heisenberg superlattices: experimental and theoretical studies

We report results on the temperature dependence of the susceptibilities of a set of MBE-grown short-period EuTe/PbTe antiferromagnetic superlattices having different EuTe layer thicknesses. In-plane and orthogonal susceptibilities have been measured and display a strong anisotropy at low temperature, confirming the occurrence of a magnetic phase transition in the thicker samples, as seen also in neutron diffraction studies. We suggest that dipolar interactions stabilize antiferromagnetic long-range order in an otherwise isotropic system and we present numerical and analytical results for the low-temperature orthogonal susceptibility.Comment: 30 pages, 8 ps figures, RevTe

Competição entre adubos fosfatados em milho (Zea mays L)

This paper relates the results of an experiment designed to study the comparative effects of several phosphates applied to corn crops. The following phosphates were applied to a latin square of 6x6: Latif (a rock phosphate), fospal, superphosphate, fertifos, hiperfosfato and serranafosfato (a fusion phosphate). The nutrients were employd at the rates of 200 kg of N (as Chilean nitrate), 200kg of K2O (as muriate of potash) and 200 kg of P205. To correct the acidity and to improve the poor physical conditions of the sandy soil studied limestone (450 kg/Ha) and cotton seed meal (900 kg/Ha) were added to all plots; liming was made one month in advance to the planting. In the second year, in the same place, the split-plot technique was used: half plot received only N and K20 whereas the other half received the same treatment as the year before. The results can be summarized as follows: 1. in the first year, superphosphate of lime, produced better results than the other phosphates; there was no significant difference among fertifos, serranafosfato, and hiperfosfato but these phosphates proved to be superior to fospal and Latif; 2. in the second year, superphosphate, fertifos and serranafosfato produced practically the same effect, being better than hiperfosfato, fospal, and Latif which did not differ signicantly; 3. the increase in yield due to the reapplication of phosphates to the half plots was not advantageous under an economic point of view; however, it is interesting to note that the yield was still benefited in spite of the heavy doses of phosphates applied the year before

In vitro Anti-HMPV activity of new synthetic phenytoin derivatives

New derivatives of synthetic 5,5-diphenylhydantoin (phenytoin) were prepared by N-alkylation with 1,3-dibromopropane. Subsequent treatment with sodium azide led to the respective azide. Reaction of the azide with phenylacetylene and 2-hydroxy-3-butyne and oxidation of the resulting alcohol with MnO2 resulted in three triazolic compounds that were evaluated in vitro for their antiviral activity against human metapneumovirus (HMPV). 5,5-Diphenyl-3-[3-(4-phenyl-1H-1,2,3-triazol-1-yl)propyl]imidazolidine-2,4-dione was the most active of the three compounds tested, with selectivity index of 129.87, even higher than ribavirin, the control substance. The three compounds showed activity in the early stages of viral replication presenting virucidal activity and binding to cellular receptors, preventing the adsorption of viral particles. These compounds showed higher activity in both experiments, inhibiting 98.3% of infection as virucidal and 98.9% when interacting with cellular receptors. Furthermore, they showed 73.8% of activity during the penetration of HMPV particles into cells. The derivative 3-{3-[4-(1-hydroxyethyl)-1H-1,2,3-triazol-1-yl]propyl}-5,5-diphenylimidazolidine-2,4-dione presented a mild anti-HMPV activity, with selectivity index of 2.74. 3-[3-(4-acetyl-1H-1,2,3-triazol-1-yl)propyl]-5,5-diphenylimidazolidine-2,4-dione inhibited less than 50% of HMPV replication