Programa de Pós-graduação em Zootecnia

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Navegando Programa de Pós-graduação em Zootecnia por Por Unidade Acadêmica "Escola de Veterinária e Zootecnia - EVZ (RMG)"

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    Morfometria e a ocorrência de hiperqueratose em tetos de vacas gir e mestiças ½ holandês e 1/2 gir
    (Universidade Federal de Goiás, 2019-09-09) Abreu, Morgana Pontes; Santos, Marcos Veiga; http://lattes.cnpq.br/8345833429933187; Cordeiro, Clarice Gebara Muraro Serrate; http://lattes.cnpq.br/5073363015303780; Zacaroni, Ozana de Fátima; http://lattes.cnpq.br/4582215859105753; Zacaroni, Ozana de Fátima; Cunha, Paulo Henrique Jorge da; Carmo, Adriana Santana do
    Mastitis is the most prevalent disease in dairy cattle, leading to substantial production losses and having a multifactorial etiology. Its occurrence in herds is associated with the health of the animal, environment, and management practices. Numerous risk factors have been described for the disease, one of which is hyperkeratosis. This condition is characterized by the accumulation of large amounts of keratin and the proliferation of corneal tissue, primarily due to mechanical forces exerted by milking equipment. Thus, the objective of this study was to evaluate teat morphometry, the occurrence of hyperkeratosis, somatic cell counts, and the correlation of these parameters with zootechnical data in 269 dairy cows (47 Gir and 222 1/2 Girolando) from the same farm. Following approval by the Animal Use Ethics Committee (CEUA) under protocol number 054/18, data were compiled on breed, number of lactations, days post-partum, peak milk production in the current lactation, somatic cell count, teat length, width, and hyperkeratosis. Hyperkeratosis was classified in scores, with scores one and two considered mild, and three and four severe. One anterior and one posterior teat of each cow, always contralateral, were evaluated. The data were tabulated in Excel 2010® and analyzed in R® using Analysis of Variance, Binary Logistic Regression, and odds ratio tests, with a significance level of 5%. No difference was found in teat length between Gir and Girolando cows; however, Gir cows had wider teats than Girolando cows. Girolando teats and cows showed a higher likelihood of developing severe hyperkeratosis compared to Gir cows. Anterior teats had a 68% higher chance of developing severe hyperkeratosis. Regarding length, the longer the teat, the greater the chance of severe hyperkeratosis, regardless of breed. Zootechnical data showed differences only for lactation period and number of lactations. Cows with two or more lactations were more likely to develop severe hyperkeratosis than primiparous cows, and the longer the postpartum period, the greater the occurrence of severe hyperkeratosis. In conclusion, on the same farm, 1/2 Girolando cows are more susceptible to severe hyperkeratosis than Gir cows.
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    Desempenho e saúde intestinal de frangos de corte suplementados com probiótico e ácidos orgânicos na ração
    (Universidade Federal de Goiás, 2025-03-12) Dias, Allan Gabriel Ferreira; Stringhini, José Henrique; http://lattes.cnpq.br/8505634095383289; Leandro, Nadja Susana Mogyca; http://lattes.cnpq.br/3136809931691012; Café, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; Café, Marcos Barcellos; Lucca, Érica Crosara Ladir de; Brito, Alexandre Barbosa de; Carvalho, Fabyola Barros; Almeida, Ana Maria de Souza
    Embargada.
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    Máquina de aprendizado extremo para predição de ganho médio diário à desmama em bovinos
    (Universidade Federal de Goiás, 2022-12-20) Lisboa, Giovanna Rodrigues; Bertazzo, Rodrigo Possa; http://lattes.cnpq.br/7503210823802793; Mascioli, Arthur dos Santos; http://lattes.cnpq.br/6557055478323026; Arnhold, Emmanuel; http://lattes.cnpq.br/7156945506134934; Arnhold, Emmanuel; Leite, Carla Daniela Suguimoto; Hellmeister Filho, Paulo
    Extreme Learning Machines, Extreme Machine Learning (EML/IGASE), unlike other Artificial Neural Network (ANN) training algorithms that adjust network parameters through the iterative presentation of training patterns, include intermediate neuron numbers and perform projection random in the hidden layer, in general of high dimensionality in the complex connections with the other variables of direct inputs, the weights are selected in a random way injected and bijected in the complex composite functions, without need of training. The over- sizing of the EML/IGASE becomes necessary for the smoothing of the response, guarantees the capacity of generalization and transfers of complex functions in the temporal series of phenotypic expressions of the animals. The objective of this work is to predict the average weight gain at weaning (GMPD) phenotype as a function of direct variables measured in animals within and between seasons (SF) and farms (FAZ), using EML/IGASE. 8,812 progeny records were used for 11 harvests, descendants of 272 bulls, from 09 farms located in different states of the federation, Mato Grosso (MT), Mato Grosso do Sul (MS), Paraná (PR) and São Paulo (SP). ). The phenotypes studied were weight at weaning (PD), average weight gain at weaning (GMPD), conformation at weaning (CPD), musc ulature at weaning (MPD) and early weaning (PPD). Extreme Machine Learning (EML/IGASE) was able to predict the mean weight gain at weaning (GMPD) phenotype, based on the other variables measured in the animals within and between seasons and farms studied, with low Mean Squared Error (MSE) in the robust interactions and transfers of complex functions from multi-input neural architectures and different levels of environmental attributables to the expressed phenotypes. In the univariate analyzes with the input variable weights at weaning (PD) transferring to the average weight gain at weaning (GMPD) the EML/IGASE performed complex numeric al predictions in 08 productive harvests of the 09 farms, where the Mean Squared Errors (EQM) between predicted and actual variables of GMPD ranged from 0.09 to 13.96%. For the multivariate analyzes with the four input variables weight at weaning (PD), conformation at weaning (CPD), musc ulature at weaning (MPD) and precocity at weaning (PPD) in 09 harvests of the 09 productive farms, the Mean Squared Errors (NDE) between predicted and actual GMPD variables ranged from 0.08 to 26.30%. The complex transfer functions were robust to noise tests up to the second decimal place in the numeric al predictions considered in the study.
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    Fósforo disponível na nutrição e saúde óssea de peixes teleósteos
    (Universidade Federal de Goiás, 2023-09-21) Menezes, Ludmila Lopes de Castro; Bueno, Guilherme Wolff; http://lattes.cnpq.br/2055316269740101; Guimarães, Igo Gomes; http://lattes.cnpq.br/1959358415883904; Guimarães, Igo Gomes; Val, Adalberto Luis; Souto, Cristielle Nunes; Oliveira, Denise Silva de; Mello, Heloisa Helena de Carvalho
    This thesis aimed to investigate the use of available P (AP) in diets of teleost fish species, considering its effects on growth, health, bone development and mineralization of skeletal structures. For this purpose, scientific experiments were conducted to determine the quantitative and qualitative implications of the consumption of diets containing levels of adequate dietary correspondence, below and above the specific nutritional requirements of each species. The results of these studies resulted in the elaboration of two scientific articles, whose approaches and main features are described below. The first article aimed to determine the nutritional requirement of AP for tambaquis (Colossoma macropomum) in the final growth phase (± 400 to 1000 g). The results indicated that AP supplementation did not affect the growth of tambaquis fed plant-based diets, and the diets containing 4.1 g/kg of AP. were sufficient to sustain growth in the evaluated phase. However, for adequate mineralization of the whole body and mineralized structures, the level in the diet of tambaquis is 10.3 g/kg AP. The second article investigated the impacts of AP. deficiency and the effect of restoring the mineral in the diet in three species of teleost fish: tilapia (Oreochromis niloticus), pirapitinga (Piaractus brachypomus) and panga (Pangasius pangasius). The results showed that phosphorus deficiency increased body fat deposition, however, restoring the AP supply was not able to completely reverse this adiposity. The dynamics of mineral deposition in mineralized structures was speciesspecific, with the cephalic bones being the main source of mineral mobilization in situations of deficiency. The findings indicate that reestablishing the AP supply after a long period of deficiency is able to restore the physiological well-being of the fish evaluated in this study. The results obtained highlight the importance of assessing the impacts of phosphorus deficiency at different stages of rearing and the use of appropriate parameters to determine the level of AP in the diets of teleost fish. Although bone abnormalities are visible and relevant indicators, they represent only a part of the consequences of phosphorus deficiency, with the metabolic and physiological effects being less apparent. Therefore, a more comprehensive approach focusing on parameters related to the physiological well-being of teleost fish can contribute to more sustainable and environmentally friendly aquaculture
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    Óleos essenciais, ácidos orgânicos e probióticos associados ao antibiótico melhorador de desempenho em rações para frangos de corte
    (Universidade Federal de Goiás, 2022-03-26) Santos Neto, Lindolfo Dorcino dos; Leandro, Nadja Susana Mogyca; http://lattes.cnpq.br/3136809931691012; Stringhini, José Henrique; http://lattes.cnpq.br/8505634095383289; Café, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; Café, Marcos Barcellos; Laboissière, Michele; Carvalho, Genilson Bezerra de; Costa, Miliane Alves da; Martins, Julyana Machado da Silva
    The use of alternative feed additives such as organic acids, probiotics, and essential oils in the poultry industry has been increasing due to restrictions regarding the use of antibiotics as growth promoters. For that, four experimental trials were conducted to evaluated the use of feed additives in association with antibiotics. The first experiment had three treatments and 10 replicates, in which 660 one-day-old chicks (22 birds per pen) were distributed in a completely randomized design. The treatments were as follows; treatment 1: basal diet plus enramycin addition. Treatment 2: basal diet without feed additives addition. Treatment 3: basal diet plus enramycin and essential oil addition. The second experiment had the same experimental design of the first one; however, with the following treatments: treatment 1, basal diet plus enramycin addition; treatment 2, basal diet without feed additives addition; treatment 3: basal diet plus enramycin and organic acid addition. The third experiment also used the same experimental design; although with the following treatments: treatment 1, basal diet plus enramycin addition; treatment 2, basal diet without feed additives addition; treatment 3: basal diet plus enramycin and probiotic addition. The fourth experiment was conducted with a completely randomized design with two treatments and ten replicates (22 birds por replicate), totalizing 440 one-day-old chicks. The treatments were as follows, treatment 1: basal diet plus enramycin addition associated with essential oil and probiotic, Treatment 2: basal diet plus enramycin associated with organic acids and provbiotics. No statistical differences were observed among treatments for final average body weight, body weight gain, feed intake nor feed conversion (P>0.05). Neither were observed differences among treatments for carcass and commercial cuts yield (P>0.05), which were analyzed in two birds per experimental unit at 42 days of age.