Mestrado em Zootecnia (EVZ)
URI Permanente para esta coleção
Navegar
Navegando Mestrado em Zootecnia (EVZ) por Por Orientador "Mascarenhas, Alessandra Gimenez"
Agora exibindo 1 - 4 de 4
Resultados por página
Opções de Ordenação
Item Ácido guanidinoacético em dieta pré-inicial para frangos(Universidade Federal de Goiás, 2017-03-28) Borges, Kamilla Martins; Mello, Heloisa Helena de Carvalho; http://lattes.cnpq.br/5510965166352073; Café, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; Mascarenhas, Alessandra Gimenez; http://lattes.cnpq.br/9082632592936909; Mascarenhas, Alessandra Gimenez; Rocha, Fernanda Rodrigues Taveira; Leandro, Nadja Susana MogycaCreatine is a substance that provides temporary energy. Guanidinoacetic acid (AGA) is a natural precursor of creatine, and can be added to feeds. The AGA provided acts as an energetic substrate with lower protein degradation with amino acid shift for gluconeogenesis, improving the initial performance of the birds. To evaluate the AGA in broiler chicken diet, an experiment was carried out using rations formulated for the pre-initial phase. Treatments consisted of a basal diet without AGA and rations with 0.10 and 0.20% AGA. A total of 252 male cutting chicks, distributed in a completely randomized design (DIC), with seven replicates and 12 birds per experimental unit were used. Feed consumption, weight gain and feed conversion were evaluated at seven, 14 and 21 days of age. Six days later, blood samples were collected for the determination of creatinine, creatine kinase (CK) and glucose and two metabolism tests were performed one at three and the other at 17 days of age. Data were submitted to analysis of variance ANOVA and the means were compared by the Tukey test. In the period of 1 to 7 days, an improvement in the feed conversion of animals receiving 0.20% AGA was observed. In the period from 7 to 14 days there was improvement in feed conversion and tending to improve the weight gain of the animals that received 0.20% AGA. There was no cumulative effect of AGA use on experimental rations fed to broiler chickens from 1 to 7 days of age on performance up to 21 days of age. Blood creatinine values at six days of life did not show significant differences. Animals that received 0.20% AGA presented higher CK blood concentration than the other treatments. The blood glucose concentration did not present statistical differences between treatments. The crude protein metabolism coefficient (CMPB) was increased within 3 to 7 days for animals receiving 0.20% AGA in the diet. There was no difference between treatments in the period from 17 to 21 days for the metabolization coefficient. The animals' intestinal weight and length did not show differences between treatments. Levels of 0.10 and 0.20% of AGA in the pre-starter diet improves weight gain and feed conversion over the period from 1 to 14 days of age in broilers.Item Uso do probiótico Bacillus amyloliquefaciens na dieta para frangos(Universidade Federal de Goiás, 2021-03-05) Brasileiro, Júlio César Lopes; Café, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; Mello, Heloisa Helena de Carvalho; http://lattes.cnpq.br/5510965166352073; Mascarenhas, Alessandra Gimenez; http://lattes.cnpq.br/9082632592936909; Leandro, Nadja Susana Mogyca; Leite, Paulo Ricardo de Sá da Costa; Mascarenhas, Alessandra GimenezThe use of antibiotics in animal feed is increasingly a reason for questioning and discussion with the focus on food safety and the possibility of the emergence of bacterial resistance that may reflect on human therapy. Alternatives have been researched to replace the use of antibiotics in animal production with additives considered more innocuous, especially probiotics. Thus, to evaluate the use of probiotic associated or not with the presence of performance-enhancing antibiotic, 1400 one-day-old male Cobb-500® chicks were distributed in a completely randomized design (DIC) in a 2 x 2 factorial scheme totaling four treatments and ten repetitions including 35 birds in each plot covering the 42-day experimental period. Avilamycin was used as a performance-enhancing antibiotic and the variables studied in the present study included the zootechnical performance index, carcass yield and intestinal histomorphometry. For the variable of zootechnical performance index in the period of one to 21 days, an effect of the use of probiotic for feed conversion was observed, with the birds that received the probiotic presented a better conversion index when compared to the group of birds that did not receive addition. of probiotic and antibiotic in diets. For the intestinal histomorphometry parameter, the interaction between factors was observed, in which the group of birds that consumed the antibiotic-free diet and included with the probiotic presented better villus height concomitant to the villus: crypt in the duodenum ratio and better villus height concomitant to the depth of crypts in the ileum, demonstrating to be a viable alternative of substitution against the antibiotics used in the poultry farming.Item Capacidade antioxidante de Scutellaria baicalensis para codornas japonesas na fase de postura(Universidade Federal de Goiás, 2020-03-10) Pereira, Melody Martins Cavalcante; Mello, Heloísa Helena Carvalho; http://lattes.cnpq.br/5510965166352073; Mascarenhas, Alessandra Gimenez; http://lattes.cnpq.br/9082632592936909; Mascarenhas, Alessandra Gimenez; Almeida, Vivian Vezzoni de; Santos, Bruno Moreira dosActive ingredients with antioxidant, anti-inflammatory, antimicrobial functions, among others, obtained from plants have been increasingly studied in search of alternatives that can replace synthetic products that have such effects, used as additives in animal feed. Plants rich in flavonoids stand out in these research, such as the genus Scutellaria baicalensis which is a herb traditionally used in Chinese medicine, which is composed of different flavonoids. The benefits of extracting this species have been observed in many human and animal studies, and specifically for poultry there are studies on broilers and laying hens. However, there is little research using it for Japanese quail. The objective of this study was to evaluate the zootechnical performance, quality of eggs of Japanese quails, receiving additive containing Scutellaria baicalensis extract added to the feed, as well as its antioxidant activity and determination of total flavonoids. 384 42-day-old Japanese quails were used, distributed in four treatments (0; 0.1; 0.2; 0.3% of the product containing Scutellaria in the diet) with six replications of 16 animals each. The design used was completely randomized (DIC). The experimental period was 126 days subdivided into four 21-day cycles. For egg quality analysis, variables such as: average egg weight (g), egg yolk, albumen and shell weight (g), shell thickness (mm), Haugh unit, yolk, albumen and shell index and percentage were evaluated. , specific gravity. The antioxidant activity of the product containing Scutellaria baicalensis was evaluated by FRAP, ABTS, DPPH methods and total flavonoids and total phenols were assayed. The collected data were submitted to ANOVA and Tukey test using the R computational package. The significance level of α = 0.05 was adopted. There were no statistically significant differences in egg performance and quality parameters, showing that the tested levels of the additive containing Scutellaria Baicalensis did not provide improvement or changes in these parameters for Japanese quails. The results of the five laboratory tests performed to evaluate the antioxidant capacity of the additive showed that it has antioxidant potential.Item Ácido guanidinoacético para leitões(Universidade Federal de Goiás, 2016-03-15) Teixeira, Karla Andrade; Mello, Heloisa Helena de Carvalho; http://lattes.cnpq.br/5510965166352073; Arnhold, Emmanuel; http://lattes.cnpq.br/7156945506134934; Mascarenhas, Alessandra Gimenez; http://lattes.cnpq.br/9082632592936909; Mascarenhas, Alessandra Gimenez; Carvalho, Thony de Assis; Campos, Melissa Selaysin DiIn the search for improved animal performance, has been testing new substances and new products to be used as additives in feed. Creatine and their precursors are examples of such compounds used for improvement of animal productivity. The guanidinoacetic acid is a natural precursor of creatine that has been studied in order to verify their effects on animal performance. With the objective of verify whether supplementation of guanidinoacetic acid in diets could help save the arginine used for the synthesis of creatine, which can be diverted to protein synthesis, growth and development of the animal. 90 piglets weaned at 21 days of age were used. The animals were distributed in a randomized block design based on the initial weight of the animals, with five treatments (0.00, 0.05, 0.10, 0.15 and 0.20% of inclusion of guanidinoacetic acid) six replicates and three animals per experimental unit. The experimental diets and water were fed ad libitum in the pre-initial I phase (21 -32 days old) and pre-initial II (33-42 days old), and the initial phase (43-63 days old). At 42 and 63 days old blood was collected from an animal for experimental unit to analyze creatinine and creatine kinase. They were analyzed daily weight gain, daily feed intake and feed conversion in phases pre-initial (21-42 days old), initial (43-63 days old) and the total duration of the experiment (21-63 days old). All variables were subjected to analysis of variance and regression analysis. It was adopted α = 0.05 and considered trend between α 0,05 and 0,10. In the pre-initial phase (21-42 days), there was a tendency to parameter gain weight daily (P= 0,069), however daily feed intake and feed conversion were not affected significantly by the addition of different levels of guanidinoacetic acid in the diet. As for the blood variables, creatinine levels both at 42 as at 63 days were not significantly affected. For creatine kinase levels at 42 days there was a tendency (P = 0.077), but after 63 days there were significant influences. In the initial phase (43-63 days) and total experimental period (21-63 days) were no significant effects of the inclusion of guanidinoacetic acid, both for performance variables as for creatinine and creatine kinase.