Fernando Gomes de Castro Júnior

Adição de frutoligossacarídeo em dietas para leitões desmamados: desempenho, incidência de diarreia e metabolismo

In order to evaluate the effect of frutooligosaccharide prebiotic addition on performance, incidence of diarrehea and metabolism of weaned pigs, two experiments were carried out. It was used three diets containing 0.2; 0.4 or 0.6% frutooligosaccharide formulated from basal diet (no addition of frutooligosaccharide), totalizing four experimental diets. In experiment 1, 96 weaned piglets (5.89 ± 0.86 kg) were used to evaluate weight gain, feed intake, feed conversion and diarrhea occurrence on the first 15 days of experiment. In the experiment 2, the same diets were tested for energy and nitrogen metabolism of the piglets (17.93 ± 0.66 kg). Levels of frutooligosaccharide had quadratic effect on weight gain, whose best result were obtained with the level of 0.31% of this prebiotic. Significant differences were not verified in the feed conversion neither on incidence of diarrhea. The use of frutooligosaccharide in diets for piglets did not influence digestibility neither metabolizability of experimental diets.

Obtenção de animais negativos para Circovírus suíno 2 oriundos de granjas positivas: estratégia de manejo

The present study describes a strategy to obtaining PCV2-negative animals from a PCV2-positive herd. Sixteen piglets were selected from females that had their IgG anti-PCV2 and viral circulation followed during pregnancy. These 7-days old piglets were transferred to the research unit. During the period from 7 to 49 days of age, serum, nasal and fecal swabs were collected every seven days. After this period, three animals remained in the research unit and were followed from 49 to 114 days of age, with samples taken each 28 days. No difference (p = 0.317) in viremia between gilts (n = 6) and sows (n = 10) were observed. Regarding the IgG levels, a significant difference (p = 0.0213) were found between gilts and sows. The piglets (n = 16), obtained from the two females, were transferred to the research unit. The animals between 7 and 10 and 49 and 52 days of age showed a decreased of the IgG title and absence of IgM; the serum and fecal and nasal swabs were negative for PCV2 DNA. After 49 days of age, the three remained animals negative for IgG, IgM and viral DNA for PCV2. In conclusion, the strategy of handling used herein allowed the obtention of PCV-2 negative pigs from PCV2-positive herds.