Danyel Bueno Dalto

Efeito da ractopamina na performance e na fisiologia do suíno

O objetivo deste trabalho foi avaliar a inclusao de diferentes niveis de ractopamina em racoes de suinos em fase de terminacao, durante 21 dias pre-abate, sobre as caracteristicas de desem- penho, carcaca, qualidade de carne e sobre parâmetros fisiologicos e sanguineos indicado- res de bem-estar. Foram utilizados 36 suinos comerciais, 18 machos castrados e 18 femeas, com peso medio inicial de 87,0±5,02 kg, alimenta- dos ad libitum com racoes isonutrientes, com 0, 10 e 20 ppm de ractopamina. O delineamento experimental foi em blocos casualizados, fatorial 3 x 2, com seis repeticoes para os parâmetros de desempenho e 12 repeticoes para os demais parâmetros. Houve efeito linear (p<0,05) positivo para o ganho de peso e para a conversao alimen- tar e efeito quadratico (ponto de minima de 9,4 ppm de ractopamina) para o consumo de racao. Para os parâmetros de carcaca houve efeito quadratico para o rendimento de carcaca (com ponto de maxima para 9,5 ppm de ractopamina). O valor de a*(componente vermelho-verde), c*(indice de saturacao) e marmoreio apresentaram efeito linear negativo. O diâmetro da fibra muscular do musculo L. dorsi e o ângulo de tonalidade (h*) apresentaram efeito linear positivo para os niveis de ractopamina. Outros parâmetros relacionados a qualidade da carne nao foram influenciadas pelos tratamentos, resultando em carnes livres de PSE e DFD. A ractopamina pode ser utilizada nas racoes de suinos ate 20 ppm com efeitos positivos no desempenho e na carcaca, sem alteracoes no comportamento dos animais e comprometimentos na qualidade da carne.

Efeito de dietas contendo plasma sanguíneo desidratado sobre características microbiológicas, imunológicas e histológicas de leitões leves ao desmame

The aim of this experiment was to evaluate the effects of spray-dried plasma (SDP) on the growth performance, immunological, histological and microbiological profile and weight of organs of light weight weaned pigs. The trial was done using 24 pigs with an initial mean age of 21 days in a completely randomized experimental design. The treatments were: T1 - heavy weight weaned pigs, without SDP supplementation; T2 - light weight weaned pigs, supplemented with 10g/animal/day of SDP; T3 - light weight weaned pigs, supplemented with 20g/animal/day of SDP; T4 - light weight weaned pigs, without SDP supplementation. The inclusion of 20g of SDP in the diet improved the weight gain, spleen weight (g/kg) and serum IgA title between 21 and 31 days of age. The inclusion of 10g of SDP in the diet improved the length and width of the ileocolic lymph node. In the first 10 days after weaning, SDP improved the development of lymphoid organs and the protection of the intestinal mucosa.

Farelo de gérmen de milho desengordurado associado à fitase

The objective of this study was to evaluate the effect and the interaction of phytic acid (used in fattening pig diets, mainly through of defatted corn germ meal (FGMD)), and phytase on performance, serum profile and carcass traits. Thirty two pigs from a commercial line Pen Ar Lan averaging 60.31±5.32 kg (SD) of initial body weight were used. Animals were fed ad libitum during 29 days and it was measured the average daily feed intake, average daily gain and feed conversion ratio. Blood samples were taken at 14th day of the experiment and a complete blood count and serum phosphorus, calcium, iron, triglycerides, choles-terol and urea concentrations were performed. Levels of phosphorus and calcium in faeces also were evaluated. A greater feed intake was observed when FGMD was included in the diets (p<0.05). However, the other performance variables, carcass and hematological parameters were not influenced by both FGMD and phytase factors (p£0.05). Barrows had a greater urea excretion, carcass weight and backfat thickness than females (p<0.05). In other hand, females had a greater meat yield of the chilled carcass compared to barrows (p<0.05). Finally, when the phytase was added on feed, pigs had a lower level of phosphorus and calcium in faeces (p<0.05). In conclusion, diets containing higher levels of phytic acid (with FGMD as ingredient) did not affect the parameters studied.