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Made available in DSpace on 2018-12-11T17:35:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-10-01. Added 1 bitstream(s) on 2021-07-15T15:04:25Z : No. of bitstreams: 1 S1516-635X2017000400717.pdf: 161837 bytes, checksum: 46bd3a18130b3ef717d72076292c037b (MD5) Among the several factors required in breeding laying hens, debeaking is a factor that interferes with batch performance and affects animal welfare. Thus, the objective of this study was to evaluate three different debeaking procedures and to verify the best technique to be used. For this, the performance of the birds, the incidence of cannibalism, and in rearing phase, the quality of the eggs were evaluated. Dekalb White birds were distributed in a completely randomized design with three treatments, T1 (infrared radiation debeaking) T2 (hot blade debeaking) and T3 (V debeaking).The data was submitted to Analysis of Variance and compared by Tukey’s test (95%), using statistical software R. The frequencies of mortality and cannibalism were submitted to the Chi-Square test (Software R). It was observed that mortality was lower with IR debeaking in the breeding phase. Already in the rearing phase, the mortality was similar between the debeaking techniques and the cannibalism was null. The final mean weight (g), mean weight gain (g) and average daily weight gain in the rearing and egg quality variables were higher for V debeaking when compared to other techniques. It is concluded that V-debeaking provides better bird performance, resistance and shell thickness when compared to the infrared radiations and hot blade debeaking, in addition to subjecting the birds to less stress. São Paulo State University “Júlio de Mesquita Filho” FCAT Unesp São Paulo State University “Júlio de Mesquita Filho” FCA Unesp São Paulo State University “Júlio de Mesquita Filho” FMVZ Unesp Hendrix Genetics Ltda São Paulo State University “Júlio de Mesquita Filho” FCAT Unesp São Paulo State University “Júlio de Mesquita Filho” FCA Unesp São Paulo State University “Júlio de Mesquita Filho” FMVZ Unesp

The objective of this study was to investigate the influence of two cleaning and disinfection programs on broiler performance and on the microbiological status of the facilities. This trial was an observational study of comparative character. Two experiments were conducted, with 960 birds each. Both experiments were carried out in a positive-pressure broiler house. Broilers were distributed in pens equipped with a bell drinker and a tube feeder each. In the first experiment, new wood shavings were used as litter material, and in the second, reused wood shavings were used. Two treatments with16 replicates of 30 birds each were evaluated. The regular treatment consisted of dry and wet organic matter removal, followed by washing. The European treatment consisted of dry organic matter removal, humidification, washing with water under high pressure, detergent application, rinsing, and application of two combined disinfectants: glutaraldehyde 250g/L + formaldehyde 185g/L; p-chlor-m-cresol 210 g/L. Biosecurity measures were adopted during daily management tasks to prevent cross contamination between treatments. The effectiveness of the treatments was evaluated by microbiological analysis performed before and after treatment applications, as well as by broiler performance results. Live performance results were similar between both treatments when broilers were reared on new litter. When reused word-shavings were used as litter material, the European treatment promoted better broiler performance. The European treatment was more effective than the regular treatment in reducing total microbial counts in the facilities when reused wood shavings were used as litter material, and positively influenced broiler performance.

In this study, 600 one-day-old male Cobb 500 broilers were distributed according a completely randomized experimental design into the different dietary treatments. Broilers were fed the following dietary treatments: positive control diet (PC), containing 54 ppm zinc bacitracin; negative control diet (NC), with no inclusion of performance enhancers and 3% reduction in metabolizable energy, crude protein, and amino acid levels; PC up to 33 days and then NC, with the dietary addition of 75, 150, or 225 ppm plant extracts, until day 42 days of age. Broiler performance and carcass yield were evaluated. Data were analyzed using the Statistical Analysis System package (SAS Institute Inc., 2008), and submitted to polynomial regression analysis using the GLM procedure at 5% significance level. There was no influence of treatments on feed intake or weight gain, but feed conversion ratio of the broiler fed the plant extract was significantly higher (p0.05) of the applied treatments on carcass yield. We concluded that the replacement of performance-enhancing additives by plant extracts, at the evaluated inclusion levels, does not promote positive performance results.

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:40:19Z No. of bitstreams: 1 S1516-635X2011000100006.pdf: 110477 bytes, checksum: ce3cde0df00bbd7745bc1cee3a507a62 (MD5) Made available in DSpace on 2013-08-22T18:40:19Z (GMT). No. of bitstreams: 1 S1516-635X2011000100006.pdf: 110477 bytes, checksum: ce3cde0df00bbd7745bc1cee3a507a62 (MD5) Previous issue date: 2011-03-01 Made available in DSpace on 2013-09-30T19:25:42Z (GMT). No. of bitstreams: 2 S1516-635X2011000100006.pdf: 110477 bytes, checksum: ce3cde0df00bbd7745bc1cee3a507a62 (MD5) S1516-635X2011000100006.pdf.txt: 29283 bytes, checksum: 325a1cb10e078b44cc28c001a37a32b5 (MD5) Previous issue date: 2011-03-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T15:07:15Z No. of bitstreams: 2 S1516-635X2011000100006.pdf: 110477 bytes, checksum: ce3cde0df00bbd7745bc1cee3a507a62 (MD5) S1516-635X2011000100006.pdf.txt: 29283 bytes, checksum: 325a1cb10e078b44cc28c001a37a32b5 (MD5) Made available in DSpace on 2014-05-20T15:07:15Z (GMT). No. of bitstreams: 2 S1516-635X2011000100006.pdf: 110477 bytes, checksum: ce3cde0df00bbd7745bc1cee3a507a62 (MD5) S1516-635X2011000100006.pdf.txt: 29283 bytes, checksum: 325a1cb10e078b44cc28c001a37a32b5 (MD5) Previous issue date: 2011-03-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The objective of this study was to evaluate the internal quality of eggs of Japanese quails fed diets supplemented with chelated selenium and zinc. The experiment was carried out for 120 days, and 144 birds were divided in random blocks into four treatments (control; 0.3 ppm Se; 60 ppm Zn and 0.3 ppm Se + 60 ppm Zn). Ten, 14, 18, and 22 weeks after the beginning of lay, eggs were collected and stored under two different temperatures (environmental temperature or refrigeration) and for 10, 20, and 30 days. Eggs were analyzed for: Haugh units (HU), albumen height (AH), yolk index (YI), and albumen index (AI). Parameters were only statistically influenced by the interaction between dietary treatment and storage time. It was concluded that the addition of organic Se and Zn influenced internal egg quality when eggs were stored up to 20 days, independently of storage temperature, suggesting that the combined supplementation of organic Se and Zn improve internal egg quality and extend egg shelf life. Universidade Estadual Paulista Animal Science School São Paulo State University Medicine and Animal Science School Universidade Estadual Paulista Animal Science School São Paulo State University Medicine and Animal Science School