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Articles by E.O. Oviedo-Rondon
Total Records ( 3 ) for E.O. Oviedo-Rondon
  E. Santos-Bocanegra , X. Ospina-Osorio and E.O. Oviedo-Rondon
  Three experiments were accomplished to compare the efficacy of yellow and red xanthophylls extracted from Tagetes erectus and Capsicum sp., with synthetic citranaxanthin, canthaxanthin, and ester of beta-apo-8-carotenoic pigments at different concentrations to enhance the yellow color of chicken egg yolk. In each trial brown laying hens were placed in cages, and after seven days of feeding a sorghum-soybean diet without pigments treatments were assigned. Yolk eggs were classified with the Roche yolk color fan (RYCF) or Minolta® refractometer. In the first experiment, 168 hens were randomly distributed to seven treatments with one control group, synthetic pigments, and natural xanthophylls. In the second and third experiments, 100 hens were assigned to four different treatments consisting in the same basal diet with addition of natural xanthophylls, and three combinations of apo-ester and citranaxantin. In all experiments, after four weeks of feeding these experimental diets, the color of 10 egg yolks per treatment was evaluated 10 different times every other day or twice a week. Results indicated that live performance was not affected by treatments, but the egg yolk color changed significantly according to the pigment added. Hens fed with diets with 7.5 ppm of yellow xanthophylls extracted from Tagetes and 4.0 ppm of red xanthophylls from Capsicum had yolk eggs classified as color 11.7 ± 0.1. Capsicum extract levels had linear effect over RYCF. Synthetic carotenoids gave a yolk color that varies from 13 to 14 in the highest concentration, and from 12 (5%) to 14 (43%) at the lowest concentration.
  E.O. Oviedo-Rondon , S. Clemente-Hernandez , F. Salvador , Peter Williams and Riccardo Losa
  One trial was conducted to evaluate the effects of two specific essential oil (EO) blends in broilers infected with viable oocysts of mixed Eimeria spp. Eight treatments were evaluated which consisted of three controls, two unvaccinated treatments and three treatments vaccinated at day of hatch with Advent® coccidia vaccine. The three controls were: 1) Unmedicated-Uninfected (UU), 2) Unmedicated-Infected (UI), and 3) antibiotic plus ionophore (AI). The two unvaccinated treatments were fed diets supplemented with either Crina® POULTRY (CP) or Crina® ALTERNATE (CA) at 100 ppm. Cocci-vaccinated treatments included one group fed diets without feed additives (WFA), and two fed diets supplemented with the two EO products (CP and CA) at the same concentration. At 19 d of age, all birds except those in the UU control were infected with E. acervulina, E. maxima, and E. tenella. Lesion scores (LS) and oocyst counts (OC) were performed 7 d post-infection and anticoccidial indexes (ACI) were calculated. The non-cocci-vaccinated chickens fed the EO blend CA, and the cocci-vaccinated chickens fed WFA diets had similar feed conversion ratios to the UU broilers, 7 d post infection. The cocci-vaccinated chickens fed diets containing EO had lower relative BWG than the cocci vaccinated group fed WFA diets. The lowest OC was observed in vaccinated birds fed WFA diets. Under the conditions of this experiment, the dietary inclusion of EO blends may serve as an alternative to antibiotic and/or ionophores in mixed Eimeria spp. infections in non-cocci-vaccinated broilers, but no benefits of EO supplementation were observed for vaccinated broilers against coccidia.
  P.W. Waldroup , E.O. Oviedo-Rondon and C.A. Fritts
  A study was conducted to compare response of young broiler chicks to various levels of Lys and Arg using two different dietary approaches. In both diet types, a 4 x 5 factorial arrangement with Lys levels of 1.1, 1.2, 1.3, and 1.4% and Arg levels of 1.25, 1.35, 1.45, 1.55, and 1.65% was used. All other essential amino acids were at least 110% of NRC (1994). Corn, soybean meal, and corn gluten meal (CGM) of known composition were used. In the first diet set (BASAL + AA) a diet that contained 1.1% Lys and 1.25% Arg was fortified with L-Lysine HCl and L-Arg to provide the various levels of Lys and Arg. In the second dietary set (INTACT) each of the 20 diet combinations was formulated independently using intact protein sources to provide the desired Lys and Arg levels with the primary difference being in amount of CGM that varied from 0 to 33%. Data were subjected to ANOVA as factorial arrangement of treatments. Conflicting results between the two diet types existed. In BASAL+AA diets there were no significant differences in BW or FCR due to Lys; 1.35 to 1.45% Arg was necessary for optimum FCR. Although the Lys x Arg interaction was not significant the reduction in BW or FCR at high Lys with low Arg interaction was not significant, the reduction in BW or FCR at high Lys with low Arg appeared primarily responsible for the increased Arg needs. In the INTACT series there were significant interactions in BW and FCR for Arg and Lys, but these appeared to be associated with reduced performance on diets high (15-30%) in CGM. In a parallel study these levels of CGM reduced performance due to reduced feed intake. Thus, differences in diet type may influence response to Arg and Lys due to factors other than amino acid level per se.
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