Programa de Pós-graduação em Zootecnia
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Navegando Programa de Pós-graduação em Zootecnia por Por Orientador "Mascarenhas, Alessandra Gimenez"
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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.Item Percepção dos consumidores e profissionais de saúde sobre a produção de suínos e pesquisa de Salmonella sp. em carne suína no estado de Goiás(Universidade Federal de Goiás, 2021-06-14) Teixeira, Karla Andrade; Arnhold, Emmanuel; Stringhini, José Henrique; Mascarenhas, Alessandra Gimenez; http://lattes.cnpq.br/9082632592936909; Mascarenhas, Alessandra Gimenez; Mello, Heloisa Helena de Carvalho; Pozza, Magali Soares dos Santos; Pozza, Paulo Cesar; Almeida, Vivian Vezzoni deAlthough pork is one of the most consumed in the world, its consumption in Brazil is still low compared to other countries and other types of meat.However, when we look at pork consumption data by Brazilian state, it appears that Goiás stands out with an average consumption higher than the national one and with potential for increase. Thus, it is necessary to first understand the consumer's profile and his perspective on pork. Due to the greater access to information that the current consumer has, a multiplicity of variables or attributes present in a product influence the decision-making process of purchase and consumption, in addition, it can also be influenced by opinion makers such as health professionals. Consumers, when buying the product, are more concerned with aspects related to their health, the quality of the product in relation to the presence of possible contaminants and residues, and some are concerned with the way of production and slaughter of these animals and their well-being. In terms of quality, a major concern is the microbiological quality of the meat, since it can be contaminated with different types of pathogens, among them Salmonella sp .. Which is an important transmitter of foodborne diseases (DTAs). From this context, two surveys were carried out. The first with 361 people from the state of Goiás. By means of an electronic questionnaire with 38 questions, to know beyond the profile the consumer's perception regarding consumption habits, healthiness, quality, production system, and animal welfare. The second was carried out with 90 health professionals, in order to get to know the point of view about pork and what they recommend about it to their patients / clients. The professionals answered 15 questions. A study was also carried out to verify the presence of Salmonella sp. in meat sold in commercial points in the city of Goiânia (GO). 60 samples of fresh meat (sirloin and ham) and 40 samples of industrialized meat (sausage and ham) were collected and processed and analyzed. Samples with the presence of Salmonella sp. underwent an antimicrobial susceptibility profile analysis, 9 bases were tested. It was noticed that the profile of the people who participated in the research is quite varied and that there are still the presence of myths, doubts and misconceptions in all aspects addressed, therefore, there is a need to work on these aspects, and it is possible to do so draw up educational plans. The results obtained with the participating health professionals demonstrated that the misinformation among them still exists, especially regarding the nutritional value, the health and hygiene of pork. Thus, as it is an opinion-forming public, it is imperative that actions are developed in order to bring more information about the entire production process of the pig chain. From meat samples 16.75% of shank and 10% of loin were positive for the presence of Salmonella sp. Of the isolates, 100% showed resistance to any of the tested antibiotics and 87.5% showed multidrug resistance.