VARIABILIDADE ESPACIAL DE ATRIBUTOS FÍSICOS EM SOLO SUBMETIDO À DIFERENTES TIPOS DE USO E MANEJO

It characterization of the variability of soil attributes is necessary so that we can interpret the possible causes of variations in crop yields, because the soil has, naturally, heterogeneity its attributes. Thus, the objective of this study was analyze the spatial variability and dependecy, through the tool GS+, the physical attributes of a typic fluvia underwent two systems use and management of soil: disking and mowing lines. The area managed by disking for over 10 years has 0.5 ha and the area mowing between the lines 13 years ago has 2.3 ha both located on the systematic plan of Experimental Farm in the Valley Curu, Pentecoste. Soil samples were taken in both disturbed and undisturbed areas obeying the spacing of 15 x 15 m, 21 in the area with har- rowing and 78 in the area by mowing between the rows. The density was the only attribute which there wasn’t spatial dependence structure. The other attributes (sand, clay, silt, micro and macroporosity and gravimetric soil moisture and the mechanical resistance to penetration) showed spatial dependence of medium until high. It was observed in the mowing area is made between the lines showed lower values macroporosity and high penetra- tion resistance, the constraint condition for the growth of roots

Efficiency of metabolizable energy utilization for maintenance and gain and evaluation of Small Ruminant Nutrition System model in Santa Ines sheep

This study was carried out to estimate efficiencies of the utilization of metabolizable energy for maintenance (k m) and weight gain (k g) and to evaluate the Small Ruminant Nutrition System (SRNS) model in predicting dry matter intake and average daily gain of growing Santa Ines sheep. Twenty-four non-castrated Santa Ines sheep, at 50 days of age and with average body weight of 13.00 ± 0.56 kg, respectively, were used. After a 10-day adaptation period, four animals were slaughtered to be used as reference for estimating initial empty body weight and body composition of the other animals. The remaining animals were distributed in a random block design, with the treatments consisting of diets containing different levels of metabolizable energy (2.08, 2.28, 2.47 and 2.69 Mcal/kg of DM), with five replicates. The metabolizable energy use efficiencies for maintenance and for weight gain were calculated from the relationship between the dietary net energy for maintenance and gain and ME concentration in the diets. Evaluation of the SRNS model was performed by adjustment of simple linear regression model between the predicted (independent variable) and observed (dependent variable) values. The estimated energy use efficiency for maintenance (k m) was 0.70; and for gain weight (kg) it showed to be inversely proportional to the increase of metabolizable energy concentration in the diet. The dry matter intake predicted by the SRNS model did not statistically differ from that observed, but the model overestimated the average daily gain by 5.18%. Those results can contribute to the construction of a database, which could be condensed into several others in a predictive model of performance and feed planning for sheep reared in Brazil

Características de carcaça em ovinos alimentados com rações contendo torta de mamona

Objetivou-se avaliar a influência de rações que continham torta de mamona em características de carcaça e componentes não carcaça de ovinos. Foram distribuídos 20 ovinos Morada Nova (peso inicial de 18,7±1,18kg) em blocos ao acaso, de acordo com o sexo (machos inteiros e fêmeas), com cinco tratamentos (torta de mamona não tratada, tratada com calcário calcítico, ureia, fosfato monobicálcico e autoclavada) e quatro repetições. Não houve diferença no consumo de matéria seca, ganho de peso total e peso ao abate entre tratamentos e, consequentemente, não ocorreu na maioria das variáveis analisadas entre tratamentos. No entanto, animais alimentados com torta autoclavada e torta tratada com fosfato monobicálcico foram superiores aos alimentados com torta de mamona não tratada. Quanto à perda ao jejum, houve diferença entre animais alimentados com torta autoclavada e com ureia, o que resultou em diferença no percentual de peso de corpo vazio. Animais alimentados com torta tratada com fosfato monobicálcico apresentaram maior peso de rúmen retículo em relação aos animais do tratamento ureia. A área de olho de lombo foi melhor nos animais alimentados com torta de mamona autoclavada seguido pelos animais que ingeriram torta tratada com fosfato monobicálcico. Em geral, a torta de mamona não tratada não prejudica as características de carcaça e seus não componentes