Food safety is an important issue facing consumers, the food industry and the government. Since consumers cannot themselves easily assess food safety risks, their perception of food safety is in part a matter of trust in the food chain. This study focuses on livestock farmers and investigates the causal relationship between the factors which determine consumer trust regarding food safety and in turn their purchase likelihood. The main research questions are: 1) What are the key factors which build consumer trust in this context? 2) What are the contributions of these factors to building consumer trust? 3) Is there any relationship between consumer trust and purchase likelihood? By integrating theories developed in several disciplines, six factors, namely: providing information, competence, integrity, benevolence, credibility and reliability were identified to have a strong influence on consumer trust in livestock farmers. An exploratory study in the form of face-to-face interviews was carried out to clarify the main concerns of livestock husbandry practices, and to identify the items to measure the causal factors of consumer trust in livestock farmers regarding food safety. Because the objectives set out in this study could not be achieved by using multiple regression, which could not handle latent variables, the conceptual model was tested with a quota sample of 194 individuals in the form of a Structural Equation Model using LISREL 8.30. It was proved successful in identifying the effects of the causal factors of trust to build consumer trust and in turn to affect purchase likelihood. The factor ‘providing information’ was identified to be a key factor by which trust is built and the features that lead to trust, namely: ‘competence’, ‘integrity’, ‘credibility’, ‘reliability’, and ‘benevolence’ were identified to be factors to build trust in livestock farmers. Representatives of the livestock industry were approached to confirm the relevance of the study and facilitate the interpretation of the findings. Though there is a limitation of its generalisation due to the sampling method, there is evidence that these factors are important to building consumer trust in livestock farmers regarding food safety. The evidence also suggests that there is a strong relationship between trust and consumer purchase likelihood. The research confirms that livestock farmers could draw benefit from strategies to increase their trustworthiness and in turn positively influence consumers’ purchasing decision. This study recommends further research to apply this model in other industries where the suppliers have little contact with consumers. The differences in trust building between cultures and the communication channels that livestock farmers representatives should used are also suggested for further study. Future research on how the food industry should respond to the change in consumer trust during periods of concern about food safety is also recommended. These are valid topics for future research and will provide potential benefits for consumers and food industry as a whole.

Food safety is an important issue facing consumers, the food industry and the government. Since consumers cannot themselves easily assess food safety risks, their perception of food safety is in part a matter of trust in the food chain. This study focuses on livestock farmers and investigates the causal relationship between the factors which determine consumer trust regarding food safety and in turn their purchase likelihood. The main research questions are: 1) What are the key factors which build consumer trust in this context? 2) What are the contributions of these factors to building consumer trust? 3) Is there any relationship between consumer trust and purchase likelihood? By integrating theories developed in several disciplines, six factors, namely: providing information, competence, integrity, benevolence, credibility and reliability were identified to have a strong influence on consumer trust in livestock farmers. An exploratory study in the form of face-to-face interviews was carried out to clarify the main concerns of livestock husbandry practices, and to identify the items to measure the causal factors of consumer trust in livestock farmers regarding food safety. Because the objectives set out in this study could not be achieved by using multiple regression, which could not handle latent variables, the conceptual model was tested with a quota sample of 194 individuals in the form of a Structural Equation Model using LISREL 8.30. It was proved successful in identifying the effects of the causal factors of trust to build consumer trust and in turn to affect purchase likelihood. The factor ‘providing information’ was identified to be a key factor by which trust is built and the features that lead to trust, namely: ‘competence’, ‘integrity’, ‘credibility’, ‘reliability’, and ‘benevolence’ were identified to be factors to build trust in livestock farmers. Representatives of the livestock industry were approached to confirm the relevance of the study and facilitate the interpretation of the findings. Though there is a limitation of its generalisation due to the sampling method, there is evidence that these factors are important to building consumer trust in livestock farmers regarding food safety. The evidence also suggests that there is a strong relationship between trust and consumer purchase likelihood. The research confirms that livestock farmers could draw benefit from strategies to increase their trustworthiness and in turn positively influence consumers’ purchasing decision. This study recommends further research to apply this model in other industries where the suppliers have little contact with consumers. The differences in trust building between cultures and the communication channels that livestock farmers representatives should used are also suggested for further study. Future research on how the food industry should respond to the change in consumer trust during periods of concern about food safety is also recommended. These are valid topics for future research and will provide potential benefits for consumers and food industry as a whole.

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Submitted by admin tede (tede@pucgoias.edu.br) on 2017-05-02T11:47:21Z No. of bitstreams: 1 WILLIAM DAMÁSIO CRUZ.pdf: 2089469 bytes, checksum: 34099ffeae5db633aae0dd47c5191076 (MD5) / Made available in DSpace on 2017-05-02T11:47:22Z (GMT). No. of bitstreams: 1 WILLIAM DAMÁSIO CRUZ.pdf: 2089469 bytes, checksum: 34099ffeae5db633aae0dd47c5191076 (MD5) Previous issue date: 2012-05-04 / The present study aimed to evaluate the morphometric characteristics and efficiency of processes in different slaughter weights of the arapaima (Arapaima gigas) coming from an intensive fish farming in the Goias State. The experiment was conducted on Boi das Águas fish-farming, located in Moiporá city, distant 145 km far from the capital Goiânia. In the fattening schedule management of arapaima in the property, 500 fish fingerlings were placed with 165gr average initial weight, which was divided equally into two equal-sized ponds of 1000m ², 1.60m deep and fed with commercial feed. At the end of 16 months of fattening, 50 fish were collected at random in two ponds, and morphometric analysis was performed as well as carcass efficiency. The results of weight of whole animals were divided into 04 classes, namely: class A (7.95 to 10.47 kg), class B (10.49 to 11.70 kg), class C (12.05 to 14.90 kg) and class D (15.42 to 17,76 kg). The arapaimas measured at 16 months showed no significant differences in carcass efficiency and morphometric aspects related to gender. Despite displaying numerical differences, there was no statistical difference (P <0.05) between the weight classes. Animals slaughtered in higher weight classes provide greater fillet efficiency. According to results in this study, it is recommended that fish with average weight over 15 kg should be killed because they had a better index of fillet efficiency, indicating that the slaughter on an estimate of time, as ideal harvest on the property, is not an advised option. / O presente estudo teve como objetivo avaliar as características morfométricas e o rendimento dos processamentos nos diferentes pesos de abate do pirarucu (Arapaima gigas) procedentes de uma piscicultura comercial intensiva no Estado de Goiás. O experimento foi realizado na piscicultura Boi das Águas, situada no município Moiporá. No cronograma de manejo de engorda do pirarucu na propriedade, foram acondicionados 500 alevinos do peixe com peso médio inicial de 165gr, divididos aleatoriamente em partes iguais, em dois viveiros escavados de dimensão iguais de 1000m², 1.60m de profundidade e alimentados com ração comercial. Após os 16 meses de engorda, 50 peixes foram coletados ao acaso nos dois viveiros, e foi realizada avaliação morfométrica e de rendimento de carcaça. Os resultados obtidos de peso dos animais inteiros foram divididos em 04 classes, sendo: classe A (7,95 a 10,47 kg), classe B (10,49 a 11,70 kg), classe C (12,05 a 14,90 kg) e classe D (15,42 a 17,76 kg). Os exemplares de pirarucu aferidos aos 16 meses, não apresentaram diferenças significativas de rendimento de carcaça e aspectos morfométricos quanto ao sexo. Apesar de apresentarem diferenças numéricas, não houve diferença estatística (P<0,05) entre as classes de peso. Os animais abatidos em classes de peso mais elevadas proporcionam maior rendimento de filé. De acordo com esse estudo, recomenda-se que peixes com peso médio acima de 15 kg devem ser abatidos por apresentarem melhor índice de rendimento de filé, indicando que o abate por estimativa de tempo, como ponto ideal de colheita na propriedade, não é uma opção aconselhada.

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2003. / Härtill 4 uppsatser.

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2007. / Härtill 4 uppsatser.

Submitted by Geyciane Santos (geyciane_thamires@hotmail.com) on 2015-12-15T20:49:49Z No. of bitstreams: 1 Dissertação - Vanessa Ribeiro Reis.pdf: 1868086 bytes, checksum: 7062926683a60bb93f40e764881fe486 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-01-20T18:43:58Z (GMT) No. of bitstreams: 1 Dissertação - Vanessa Ribeiro Reis.pdf: 1868086 bytes, checksum: 7062926683a60bb93f40e764881fe486 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-01-20T18:46:34Z (GMT) No. of bitstreams: 1 Dissertação - Vanessa Ribeiro Reis.pdf: 1868086 bytes, checksum: 7062926683a60bb93f40e764881fe486 (MD5) / Made available in DSpace on 2016-01-20T18:46:34Z (GMT). No. of bitstreams: 1 Dissertação - Vanessa Ribeiro Reis.pdf: 1868086 bytes, checksum: 7062926683a60bb93f40e764881fe486 (MD5) Previous issue date: 2015-08-21 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The tambaqui Colossoma macropomum is the main farmed fish among the Brazilian native species. The female tambaqui stands out because it grows 18% more than the male in intensive farming fish system (unpublished data). When monosex cultivation is more profitable is fish industry, techniques of sex reversal can be used for directing the sexual differentiation towards to desired gender. The objective of this research was to identify the best dose of 17β-estradiol (E2) for direct feminization of tambaqui, as the first step in developing a protocol for effective sex reversal for the specie. Due to experimental control and to avoid the possible genetic effects on the results, the study was divided into two tests (September / October and November / December 2014). In every test, it was used 500 tambaqui fries (100 fries/treatment) of 30 days post hatch (dph) with an average length 14.87 ± 2.85 mm. The fries were fed diets containing different doses de E2 (0 - control, 20, 40, 80 and 120 mg/kg of E2 diet) for six weeks. After the treatments, the fish were transferred to cages where they remained growing for the sampling. Sixty days after the end of the treatment, blood sample was collected to determine the concentration of E2 in plasma. Sampling of the gonads was performed when the fish was around seven months. In the animals with standard length (SL) mean of 13.96 ± 1.29 cm it was not possible to identify the sex, due to lack of histological evidence of ovaries or testes. In the individuals in which sex could be determined, E2 demonstrated great influence on the increase in females at the highest dose. The E2 concentration in the plasma of the animals showed that this hormone was fully metabolized by the fish body, as treated (20, 40 and 80 mg/kg E2 feed) and control presented similar plasma E2 values. However, in the treatment 120 mg of E2 kg of feed the animals presented a lower plasma concentration and statistically different from the control and other treatments. This suggests that the higher dose of E2 was not only fully metabolized by the organism, but also decreased the endocrine production of this hormone (negative feed-back). The water of the treatment was analyzed before and after coloration. Results showed that there was a residual presence of E2 after the experiment which disappeared after chlorine. Our results indicate that 120 mg/kg E2 of diet administered for six weeks is the most effective treatment for tambaqui feminization from 14 mm length, and that water chloration after estradiol treatment eliminates every residue of this steroid. / O tambaqui Colossoma macropomum é o peixe mais produzido em cativeiro dentre as espécies nativas brasileiras. A fêmea se destaca por pesar cerca de 18% a mais que o macho em sistema de cultivo intensivo (dados não publicados). Quando as características zootécnicas de um gênero são mais rentáveis que de outro é comum o cultivo monosexo. As técnicas de inversão sexual podem ser utilizadas no direcionamento da diferenciação sexual para o gênero desejado. Este trabalho teve como objetivo identificar a melhor dose de 17β-estradiol (E2) para a feminização direta de tambaqui. O experimento foi dividido em dois ensaios (setembro/novembro e outubro/dezembro de 2014). Para cada ensaio utilizou-se 500 pós-larvas de tambaqui (100/tratamento), com trinta dias pós-eclosão (dpe) e com comprimento médio 14,87 mm. Foram alimentadas com dietas contendo diferentes doses de E2 na ração (0, 20, 40, 80 e 120 mg/Kg) por seis semanas. Após os tratamentos os peixes foram transferidos para tanques-rede onde permaneceram até a realização da amostragem. Sessenta dias após o tratamento foi realizada coleta de sangue. A coleta das gônadas foi realizada quando os peixes tinham entre cinco e sete meses. Nos animais com comprimento padrão (CP) médio de 13,96 ± 1,29 cm não foi possível a identificação do sexo, devido à ausência de evidências histológicas comprovatórias de ovários ou testículos. Nos animais sexados, o E2 demonstrou grande influência no aumento de fêmeas na dose mais elevada. A concentração de E2 no plasma dos animais mostrou que este esteroide foi totalmente metabolizado pelo organismo dos peixes, sendo estatisticamente igual para 20, 40 e 80 mg E2/Kg de ração e o controle. Para dose de 120 mg/Kg os animais apresentaram uma concentração plasmática de estradiol significativamente menor que o controle e demais tratamentos. Sugerindo que para essa concentração o organismo dos peixes não só metabolizou todo o esteroide consumido, mas também diminuiu a produção endógena desse hormônio. As análises da água utilizada nos tratamentos, antes e após cloração, demonstraram a eficiência deste método na eliminação total dos resquícios hormonais de estradiol. Nossos resultados mostraram que 120 mg de E2 por quilograma de ração, administrados durante seis semanas, é o tratamento mais eficaz para a feminização de larvas de tambaqui a partir de 14 mm de comprimento. E a cloração da água após o tratamento com estradiol é 100% eficaz na eliminação de resíduos deste esteroide.

Diss. Stockholm : Univ., 2004.

The aim of this work was to realize the first intensive rearing of juvenile fish of burbot in the Czech Republic (TL = 165.79 +- 18.87, W = 32.91 +- 10.27 g) in recirculation aquaculture system (RAS) at different water temperatures. A total of 9 tanks were used in the three separate RAS systems. For a period of 12 weeks survival (S), specific growth rate (SGR), feed conversion ratio (FCR) and the condition of the fish (FC) was observed at 3 week intervals. The best values of survival (98 +- 0.4%) were achieved in burbots kept at a water temperature of 15 ° C. Survival in the group of fish kept at a water temperature of 18 °C did not statistically differ from the group of fish reared at 15 °C and 21 °C. The SGR value for the fish at a water temperature of 15 °C was (0.7 +- 0.09%.d-1) at 18 °C the SGR value was (0.45 +- 0.1%.d-1) and fish kept at a water temperature of 21 °C reached SGR values of 0.33 +- 0.04%.d-1. The best FCR values (1.27 +- 0.35) were reached also in the group of fish kept at 15 °C. For burbot kept at a water temperature of 21 °C, the FCR value was 2.78 +- 1.17. Based on our results we can conclude that the most appropriate water temperature for rearing juvenile burbot was 15 °C.