Resumo
Aiming to evaluate the effect of plasma spray dried (PSD) on the performance of super early weaned piglets, an experiment was carried out in the Pigs farming sector of the Institute of Animal Science and Pasture, at Nova Odessa, São Paulo State. Fifty six piglets were used, homogeneous as for the lineage, weighing 3.87±0.65kg approximately with average age of 14 days, distributed in a completely randomize experimental design with four treatments, seven replicates and two animals per experimental unit. It was tested four levels of plasma inclusion on piglets diets into two consecutive periods, 14 to 28 days of age (first period); 29 to 42 days of age (second period). The plasma levels utilized were 0%, 2%, 4% and 6% for the first period and 0%, 1%, 2% and 3% for the second period. Into the third period (42 to 56 days of age) all the piglets were feed with no PSD. The performance of the piglets was evaluated by biweekly weighing and in the last day of experiment, when the age of allotment was equal to 56 days. The analyzed variables aiming to evaluate the performance of the animals were the average daily feed intake (DFI), average daily weight gain (ADG), and feed conversion (FC). No significant differences were observed (P>0.05) for weight gain, food intake and feed conversion. As a conclusion to the carried out experiment, it is suggested that animals fed with plasma spray
O artigo não apresenta resumo em português.
Resumo
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.
O objetivo do trabalho é descrever uma estratégia para a obtenção de animais negativos para o PCV2 oriundos de uma granja positiva para este vírus. Dezesseis leitões foram obtidos de fêmeas que tiveram os títulos de IgG anti-PCV2 e o DNA viral testados durante a gestação. Esses leitões, aos sete e dez dias de idade, foram transferidos para a unidade de pesquisa. Durante o período de 7 e 10 aos 49 e 52 dias de idade, amostras de soro, suabes nasal e fecal foram coletadas, a cada sete dias. Após esse período, três animais permaneceram na unidade de pesquisa e foram acompanhados dos 49 aos 114 dias de idade, com coletas realizadas a cada 28 dias. Não houve diferença significativa (p = 0,317) de viremia entre marrãs (n = 6) e porcas (n = 10). Com relação aos níveis de IgG, observou-se diferença significativa (p = 0,0213) entre porcas e marrãs. Os leitões (n = 16), obtidos de duas fêmeas, foram transferidos para a unidade de pesquisa. Os animais entre 7 e 10 dias e aos 49 e 52 dias de idade apresentaram queda de IgG e ausência de IgM anti-PCV2; e as amostras de soro, suabe nasal e fecal foram negativos para o DNA de PCV2. Após os 49 dias, nos três animais mantidos isolados, a detecção de IgG, IgM e DNA para PCV2 permaneceu negativa. Concluindo, a estratégia de manejo utilizada permitiu obter suínos negativos para PCV2 oriundo de granjas positivas para o agente.
Resumo
Aiming to evaluate the effect of plasma spray dried (PSD) on the performance of super early weaned piglets, an experiment was carried out in the Pigs farming sector of the Institute of Animal Science and Pasture, at Nova Odessa, São Paulo State. Fifty six piglets were used, homogeneous as for the lineage, weighing 3.87±0.65kg approximately with average age of 14 days, distributed in a completely randomize experimental design with four treatments, seven replicates and two animals per experimental unit. It was tested four levels of plasma inclusion on piglets diets into two consecutive periods, 14 to 28 days of age (first period); 29 to 42 days of age (second period). The plasma levels utilized were 0%, 2%, 4% and 6% for the first period and 0%, 1%, 2% and 3% for the second period. Into the third period (42 to 56 days of age) all the piglets were feed with no PSD. The performance of the piglets was evaluated by biweekly weighing and in the last day of experiment, when the age of allotment was equal to 56 days. The analyzed variables aiming to evaluate the performance of the animals were the average daily feed intake (DFI), average daily weight gain (ADG), and feed conversion (FC). No significant differences were observed (P>0.05) for weight gain, food intake and feed conversion. As a conclusion to the carried out experiment, it is suggested that animals fed with plasma spray
O artigo não apresenta resumo em português.