Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
 
Articles by J.L. Vicente
Total Records ( 8 ) for J.L. Vicente
  S.N. Henderson , J.L. Vicente , C.M. Pixley , B.M. Hargis and G. Tellez
  Chicks are commonly held for up to 72 h from the time of actual hatch to placement under commercial industry practices. Delaying access to feed and water has been documented to increase susceptibility to pathogens and weight loss, leading to poorly starting flocks with reduced weight gains. Seven experiments were conducted to compare the use of EarlyBird™ (EB; Sigrah-Zellet, LLC.) to no supplementation (NS) in chick boxes when chicks were held for a 24 h simulated shipping period. In each experiment, broilers were obtained from a commercial hatchery, neck tagged, individually weighed, and randomly placed in boxes of 100 chicks. Treated chicks received 2 g/chick of EB. Following 24 h, chicks were individually weighed and placed with feed and water ad libitum. In all experiments, chicks that received EB during simulated shipping experienced significantly less body weight loss during the 24 holding period (p<0.05) and were significantly heavier at 7 d. At slaughter, EB treated broilers were 58 g heavier than the controls. The results are consistent with earlier reports indicating that the dependence of chicks on residual yolk sac during the first few days post hatch limits the growth potential of modern broilers. Early feeding can not only impact the general well being of the chick but also can have significant effects on early growth, leading to increased weight gains that persist through broiler production.
  J.L. Vicente , L. Aviña , A. Torres-Rodriguez , B. Hargis and G. Tellez
  Concern about antimicrobial resistance has led to increased attention to alternatives for controlling infections and increasing performance in animal production. Probiotics and organic acids have gained attention as options in poultry industry. Our laboratory has been working in the selection of lactic acid bacteria, mainly from the genus Lactobacillus, as potential probiotic candidates. Previous data indicates that these selected probiotic bacteria are able to reduce Salmonella infection and improve performance in broiler and turkey under experimental and commercial trials in the USA. The selected probiotic organisms were used in field trials to evaluate their efficacy in commercial conditions in Mexico. In the present report, the probiotic culture significantly reduced mortality (p<0.01) compared to the control houses. Also, a consistent improvement of body weight (2.06%) and reduction of FCR (3.5%) was observed in the treated flocks. The results of this report suggest that this Lactobacillus-based probiotic culture could be useful to reduce mortality in commercial poultry farms
  J.L. Vicente , S.E. Higgins , B.M. Hargis and G. Tellez
  To evaluate the effect of a litter acidifier (PGLA) on Salmonella enteritidis(SE) horizontal transmission, two experiments were conducted with broiler chicks grown on used (Exp. 1) and new (Exp. 2) litter. In each experiment, three hundred day-old broiler chicks from a commercial hatchery were obtained and divided into three litter treatments with four replicate pens each. The treatments were: control (no litter treatment); low dose of PGLA (LD: 815g/2.27m2); and high dose (HD: 1631 g/2.27m2). In Exp. 1, two hundred-forty chicks were placed in floor pens with pine shaving-based litter previously used for at least two prior growouts (20 chicks/pen). Another 60 chicks were challenged with 7.5×103 cfu of SE (seeders), placed in a separate pen with clean new pine shaving-based litter for 24 hours, then 5 seeders (20%) were placed with the contact chicks in each respective treatment pen. Salmonella recovery from cecal tonsils of 10 chicks/ pen were evaluated on days 11 and 21. Application of PGLA at both LD and HD on used litter significantly reduced (p<0.05) SE recovery compared to controls (Control: 28%, LL: 0%; HL: 3% respectively) on day 11 after placement, but no difference was observed at day 21. However, a significant increase (p<0.05) in body weight was detected in the HD compared to the control group on d21, but not d11. Similarly, application of PGLA to clean pine shavings (Exp. 2) reduced (p<0.05) SE recovery from cecae of chicks cultured on day 11 (control: 46%; LD: 23%; HD: 18% respectively). Body weights through 21 days were unaffected by PGLA treatment of new litter. These data suggest that PGLA treatment of new or used litter may reduce early horizontal transmission of Salmonella. Enhanced 21-day performance of chicks on used litter treated with PGLA may suggest that other low-level pathogens were reduced by treatment, although further studies are necessary to confirm and extend these findings.
  A.D. Wolfenden , J.L. Vicente , L.R. Bielke , C.M. Pixley , S.E. Higgins , D.J. Donoghue , A.M. Donoghue , B.M. Hargis and G. Tellez
  Effective Competitive Exclusion (CE) cultures have been shown to accelerate development of normal microflora in chicks and poults, providing increased resistance to infection by some enteric bacterial pathogens. Our objective was to develop a CE culture for prophylaxis and reduced horizontal transmission of Salmonella enteritidis (SE) in broiler chickens. In the present study, seven members of the family Enterobacteriaceae and 2 lactic acid bacteria isolates, each capable of in vitro and in vivo inhibition of SE, were selected and combined to form the putative CE culture. In the first experiment, day-of-hatch chicks were randomly divided into four pens. All treated chicks were orally gavaged with the CE culture and 3 pens were treated with the CE culture in the drinking water for four consecutive days. Treated and control-non treated chicks were challenged with SE on day 4. All 3 groups of birds that were treated with the CE culture had a significant decrease (p<0.05) in cecal colonization compared with non-CE-treated SE-challenged chicks. Two additional experiments were designed to measure the efficacy of the CE culture in reducing SE horizontal transmission from infected to uninfected chicks when commingled. SE was recovered in the cecal tonsils with a significantly lower incidence at days 7 and 14 in Experiment 2 and day 7 in Experiment 3 from the groups that received the CE in the drinking water as compared to controls respectively. These results suggest that a relatively simple and defined CE culture can reduce SE colonization in neonatal chicks.
  A.D. Wolfenden , C.M. Pixley , J.P. Higgins , S.E. Higgins , B.M. Hargis , G. Tellez , J.L. Vicente and A. Torres-Rodriguez
  Spray application offers low-cost and efficient application of biologic and reduced concerns regarding diverse water quality and medicator/proportioner function. The objective of the present study was to evaluate the spray application of a Lactobacillus-based probiotic on Salmonella enteritidis (SE) colonization in broiler chickens. Day-of-hatch chicks were challenged with Salmonella enteritidis (SE) by oral gavage alone, challenged with SE and treated by coarse spray application of a commercially-availably Lactic-acid bacterial probiotic (FM-B11™), or challenged with SE and treated with B11 continuously in the Drinking Water (DW). Five days post-challenge, cecal tonsils were collected for presence or absence of SE. In Exp. 1, probiotic treatment by either spray or DW application significantly (p<0.05) reduced SE recovery (55% and 50% respectively; controls 85%) when chicks were held for 8h prior to challenge and placement. Similarly, when probiotic spray treatment or water treatment and challenge occurred simultaneously, with placement 8h after treatment, a marked and significant reduction of SE recovery was noted after 5d (10% and 40% respectively, controls 55%). In Exp. 2, when probiotic spray treatment and challenge occurred simultaneously, with placement 8h after treatment, a significant reduction of SE recovery was again noted in both the spray and DW application (80% controls, 15% spray, 15% DW). Taken together, these results suggest that spray application of B11, when performed in the manner described above, can be effective for protection of chicks against Salmonella infection.
  A.D. Wolfenden , C. Pixley , B.M. Hargis , G. Tellez , J.L. Vicente and L. Avina
  In poultry and other species, economic losses during transport are due to mortality, carcass shrinkage (carcass dehydration) and carcass condemnation. Feed Withdrawal (FW) prior to processing is necessary to reduce fecal ingesta contamination of carcasses during processing. Direct acidification of the water with specific concentrations of some Organic Acids (OA) has been shown to significantly reduce the amount of potential pathogens such as Salmonella on the carcasses by antemortem disinfection of the crops when used during the pre-slaughter feed withdrawal period. However, reduced water consumption due to effective OA concentrations have been shown to increase carcass shrink. In the present study, the effect of a commercially available mix of flavored organic acids significantly reduced carcass condemnation at the processing plant in 3/3 trials (p<0.05) % and mortality during transportation in 1/3 trials (0.40% treated vs. 0.65% control). A consistent improvement of average body weights at the farm and at the processing plant due to reduction of carcass shrinkage and condemnation at the processing plant were also observed in the treated marked age broiler chickens. Water intake was numerically higher in treated birds when compared with non-treated birds (72.9 mL vs. 62.5 mL). During FW, this OA product could be useful to reduce mortality, shrinkage and carcass condemnation during transportation to the processing plant of broiler chickens.
  C. Pixley , J. Barton , J.L. Vicente , A.D. Wolfenden , B.M. Hargis and G. Tellez
  The transport of live animals has important economic and welfare implications. A commercially-available organic acid product (Optimizer) was added to the drinking water of commercial hen turkeys during preslaughter Feed Withdrawal (FW) in two trials. In trial 1, a total of 60 trailers from treated (OA) or control non-treated turkey houses were evaluated. Turkey farmers initiated water treatment on the day before pick up (8-12 h treatment according to label directions). Investigators recorded trailer numbers as they were loaded out of each house to confirm which trailers contained treated birds vs. control non-treated birds. Individual trailer weights were recorded upon arrival to the processing plant and again immediately prior to live hang. A significant reduction in rate of weight loss during holding at the processing plant was observed in the treated turkeys (719 g/min per OA treated trailer vs. 845 g/min per control trailer). In trial 2, two commercial market age turkey houses were selected and in each house, 400 birds were weighed and recorded as a representative sampling. The treated house received OA administered according to manufacturer’s directions continuously for 19 h. At the end of this time, 400 birds were weighed and recorded as a representative sampling. A significant (p<0.05) improvement of average body weights was observed in treated turkeys during 19 h (125 g treated vs. 35 g control), an average of 90 grams difference. Experiments are ongoing to measure water consumption during the FW that may explain the reduction in carcass shrinkage during transportation to the processing plant and increased body weights at the farm by increasing hydration of turkeys treated with OA.
  G. Tellez , G.M. Nava , J.L. Vicente , M. De Franceschi , E.J. Morales , O. Prado , J.C. Terraes and B.M. Hargis
  A trial was conducted to evaluate the influence of dietary Aspergillus Meal (AM) prebiotic on intestinal development, morphology in turkey poults. Day-old Nicholas poults (n = 100) were randomly assigned to two groups. Poults in each group were divided and placed in floor pens with 50 poults each. One group served as a control and received a ration containing no added AM prebiotic. Poults in the treatment group were provided a ration supplemented with 0.2% AM prebiotic. Each dietary regimen and water were provided ad libitum to 30 days of age. Poults were humanely killed by CO2 inhalation and specimens of duodenum and distal ileum were collected at 10, 20 and 30 days. Histology sections were cut (5 μm) and stained with haematoxylin and eosin and combinations of either of periodic acid-Schiff with alcian blue, or high iron diamine with alcian blue stains to evaluate 20 intact villi on each section. The morphometric variables analyzed included villi height, villi surface area and crypt depth. In addition, goblet cells, classified as neutral, acidic or sulpho mucin cells, respectively, were quantitative for each treatment group. At all times of evaluation, AM prebiotic significantly increased the number of acid mucin cells in the duodenum, neutral mucin cells in the ileum and sulpho mucin cells in the duodenum and ileum. Villi height and villi surface area of both duodenum and ileum were significantly increased at days 10 and 30 compared to control. The present study suggest that AM prebiotic has an impact on the mucosal architecture and goblet cells proliferation in the duodenum and ileum of neonate poults.
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility