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Articles by Alex Maiorka
Total Records ( 3 ) for Alex Maiorka
  Elizabeth Santin , Antonio Carlos Paulillo , Alex Maiorka , Laura Satiko Okada Nakaghi , Marcos Macari1 , Ana Vitoria Fischer da Silva and Antonio Carlos Alessi
  A study was carried out to evaluate the efficacy of Saccharomyces cerevisiae (SC) as an inhibitor of aflatoxicosis in broilers. Clinic, pathologic, immune and productive aspects of broilers fed with aflatoxin in the diets were studied. The results showed that the feed intake and weight gain were negatively affected (P < 0.01) for aflatoxin in diet (1000 ppb). The SC (0, 20%) added to diet did not ameliorated the negatively aflatoxin effect at broiler weight gain, however the SC improve the feed conversion in this birds. The humoral immune response of broilers vaccinated against Newcastle virus disease (NDV) was reduced for aflatoxin in diet, as also the liver, kidneys and bursa of Fabricius were negatively affected for this toxin at diet. The SC did not improve the hemagglutination inhibiting antibody titers in birds fed with aflatoxin in diet, however improve the immune response of broilers at challenge with strain velogenic of NDV.
  Alex Maiorka , Ana Vitoria Fischer da Silva , Elizabeth Santin , Joao Martins Pizauro Jr. and Marcos Macari
  The objective of this study was to evaluate the effects of broiler breeder age and the dietary energy level (2,900 and 3,200 kcal ME/kg) on performance and pancreas lipase and trypsin activities of chicks during the first week of life. The birds from the older breeders had higher feed intake (P = 0.001) and weight gain (P = 0.001) than chicks from the younger broiler breeders. The pancreas enzymes activities were not affected by broiler breeder age, however it was influenced by the dietary energy level. Chicks fed diet with high energy content showed higher lipase activity than those submitted to low dietary energy level (P = 0.013) and trypsin activity was not affected by energy diet. No improvement on chicks performance was observed, suggesting that is not necessary to feed diets with high energy level during the first week of age.
  Sebastiao Aparecido Borges , Ana Vitoria Fischer da Silva , Ana Silvia Alves Meira Tavares Moura , Alex Maiorka and Andre Ostrensky
  Two experiments were carried out using 1,120 chicks to evaluate the electrolyte balance (EB = Na+K-Cl) in growing (21-42 days) broiler diets. The feed, based on corn and soybean meal with 20.0% CP and 3,200 kcal ME/kg, was offered ad libitum. In experiment I, K level was fixed, but Na and Cl levels varied among the four treatments, which included five replications of 40 birds each. In experiment II, increasing levels of Na and K were used, with a total of four treatments and four replications of 20 birds. In both experiments, the EB treatments were 40; 140; 240 and 340 mEq/kg of feed. EB showed a quadratic effect on weight gain and feed to gain ratio when the electrolyte ratio was increased only by the supplementation of Na. Feed intake was maximum for 264 mEq/kg, when Na level was increased in the diet, and 213 mEq/kg, when K and Na levels were concurrently increased in the diet, indicating that there is a limit over which feed intake is depressed as a function of excessive Na and/or K. The ideal EB, obtained by the manipulation of Na and Cl levels, was between 202 and 235 mEq/kg.
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