Gustavo Dias Lovato

Dietas ajustadas para suínos através do modelo InraPorc®: desempenho, características de carcaça e impacto econômico

The objective of this study was to evaluate animal performance, carcass characteristics and costs for pigs fed diets adjusted to Brazilian conditions, through the model InraPorc®. We used 36 barrows and 36 females, during the growing and finishing in a completely randomized design. The treatments were control diets and diets adjusted for both males and females. The feeding program and the animal profile were added to the model parameterization and define strategies and nutritional feed in the diets adjusted. The performance and carcass traits were not affected by treatments. The average cost to feed the animals that received the control diet was higher in 3.4% and 2.4% for the males and females respectively. Comparing the diets, the average cost to feed the animals that received the control diet was 2.9% higher. Net income was R

Modelagem da ingestão, retenção e excreção de nitrogênio e fósforo pela suinocultura gaúcha: interface vegetal

0.19 and R

Alimentação de suínos em terminação com dietas contendo ractopamina e extratos cítricos: desempenho e características de carcaça

0.66 higher for males and females which received the diet adjusted, respectively. Diets adjusted through InraPorc® for the growing and finishing pigs did not influence the performance and carcass traits, however reduced feed costs which generates higher net production.

Alimentação de suínos em terminação com dietas Contendo extratos cítricos e ractopamina: Características químicas e perfil de ácidos graxos Do músculo longissimus dorsi

A model was developed to simulate the Nitrogen and Phosphorus dynamics of pigs in the Rio Grande do Sul state, Brazil associated with corn and soybean production. The model is constituted by an animal sub-model (SMA) and a vegetable one (SMV). The general approaches of SMA are based on technological systems (ST), animal categories, N and P concentrations in diets and its digestive and metabolic efficiencies. The SMA integrates three aggregation levels, constituted by ten compartments for N and P and 300 sub-compartments related to ST and animal categories. The pig production data were divided in seven mesorregions in agreement with the physiographic definitions. The SMV is constituted by corn and soybean sub-compartments. The SMV parameters were based on the cultivated area and in the corn and soybean production of each municipal district. The simulated data show a surplus of corn and soybean in all mesorregions. Annual consumption of corn and soybean meal by pigs on the state is nearly to 1.14 and 0.39 million tons, respectively. Annual volume intake of N and P by the pigs is nearly 36 and 5.7 thousand tons, which 41% of N and 71% of P return to the environment. The simulated values of the different offer/demand sceneries of corn and soybean in Rio Grande do Sul show self-sufficiency of seven mesorregions. The flows of nutrients among soil-plant-animal-soil simulated show that Rio Grande do Sul mesorregions has levels of nitrogen and phosphorus released into the environment by the pigs below the limits imposed by the European Union. The model simulates appropriately the transfers of N and P between animal and vegetable interfaces in pig production in Rio Grande do Sul.