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Efeito da incorporação de farinha de larvas de mosca soldado negra e Chlorella vulgaris na dieta de galinhas poedeiras sobre a produtividade e a qualidade e características sensoriais do ovo
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Resumo(s)
Com o aumento da preocupação com a sustentabilidade ambiental, têm-se procurado matérias-primas alternativas, mais sustentáveis, para fabricar dietas para monogástricos. Os insetos e as algas têm demonstrado ter uma boa composição nutricional, e podem ser produzidos localmente, com uma pegada carbónica interessante. Este estudo teve como objetivo a avaliação dos efeitos da alimentação de galinhas poedeiras com uma dieta constituída por matérias-primas locais sobre os parâmetros produtivos e a qualidade e caraterísticas sensoriais do ovo. Formulou-se uma dieta controlo, com matérias-primas convencionais, e uma dieta teste, com matérias-primas locais, incluindo farinha de mosca soldado negra e Chlorella vulgaris. Durante cinco semanas, utilizaram-se quarenta e oito galinhas poedeiras da estirpe Brown Nick, alojadas individualmente. Os animais foram alimentados ad libitum, vinte e quatro com dieta controlo e os restantes com dieta teste. Os parâmetros produtivos analisados foram o peso vivo, peso do ovo, taxa de postura, massa de ovo, ingestão alimentar semanal e índice de conversão. Foi medida a altura da câmara de ar, o pH da clara e da gema e a cor da casca e da gema. Verificou-se a presença de defeitos e calculou-se a percentagem dos diferentes constituintes do ovo, o índice de forma, de casca e de gema, as unidades Haugh, a área superficial do ovo e a espessura da casca. Foi realizada análise sensorial com dois testes triangulares. Os resultados indicaram que a dieta teste resultou em menor taxa de postura (p-value = 0,0217) e massa de ovo (p-value = 0,0286). A cor da casca e da gema apresentaram-se mais acastanhada e mais alaranjada, respetivamente. Foram sentidas diferenças sensoriais entre os ovos dos dois grupos. Em suma, a alimentação das galinhas poedeiras com matérias-primas locais, incluindo farinha de inseto e microalga, apresentou efeitos negativos sobre alguns parâmetros produtivos, mas melhorou a coloração do ovo.
With the growing concern about environmental sustainability issues, alternative feesdtuffs have been sought that are more sustainable for the manufacture of compound feed for monogastrics. Insects and algae have been shown to have a good nutritional composition and can be produced locally, with an interesting carbon footprint. The aim of this study was to evaluate the effects of feeding laying hens a diet made up of local feedstuffs on production parameters and egg quality and sensory characteristics. A control diet with conventional feedstuffs and a test diet with local raw materials, including black soldier fly meal and Chlorella vulgaris flour, were formulated. Forty-eight Brown Nick laying hens were housed individually for five weeks. The animals were fed ad libitum, twenty-four on a control diet and the rest on a test diet. The production parameters analyzed were live weight, egg weight, laying rate, egg mass, weekly feed consumption and conversion rate. The height of the air chamber, the pH of the albumen and yolk and the color of the shell and yolk were measured. The presence of defects was checked and the following were calculated the percentage of the different egg constituents, the shape, shell and yolk indices, Haugh units, egg surface area and shell thickness. Sensory analysis was carried out with two triangle tests. The results showed that feeding the hens the test diet resulted in lower laying rate (p-value = 0,0217) and egg mass (p-value = 0,0286). The color of the shell and yolk was browner and more orange, respectively. There were sensory differences between the eggs of the two groups. In short, feeding laying hens with local feedstuffs, including insect meal and microalgae, had negative effects on some production parameters, but improved egg color.
With the growing concern about environmental sustainability issues, alternative feesdtuffs have been sought that are more sustainable for the manufacture of compound feed for monogastrics. Insects and algae have been shown to have a good nutritional composition and can be produced locally, with an interesting carbon footprint. The aim of this study was to evaluate the effects of feeding laying hens a diet made up of local feedstuffs on production parameters and egg quality and sensory characteristics. A control diet with conventional feedstuffs and a test diet with local raw materials, including black soldier fly meal and Chlorella vulgaris flour, were formulated. Forty-eight Brown Nick laying hens were housed individually for five weeks. The animals were fed ad libitum, twenty-four on a control diet and the rest on a test diet. The production parameters analyzed were live weight, egg weight, laying rate, egg mass, weekly feed consumption and conversion rate. The height of the air chamber, the pH of the albumen and yolk and the color of the shell and yolk were measured. The presence of defects was checked and the following were calculated the percentage of the different egg constituents, the shape, shell and yolk indices, Haugh units, egg surface area and shell thickness. Sensory analysis was carried out with two triangle tests. The results showed that feeding the hens the test diet resulted in lower laying rate (p-value = 0,0217) and egg mass (p-value = 0,0286). The color of the shell and yolk was browner and more orange, respectively. There were sensory differences between the eggs of the two groups. In short, feeding laying hens with local feedstuffs, including insect meal and microalgae, had negative effects on some production parameters, but improved egg color.
Descrição
Mestrado em Engenharia Zootécnica - Produção Animal / Instituto Superior de Agronomia, Faculdade de Medicina Veterinária, Universidade de Lisboa
Palavras-chave
Hermetia illucens Chlorella vulgaris sustentabilidade qualidade do ovo galinhas poedeiras sustainability egg quality laying hens
Contexto Educativo
Citação
Dias, A.M.L. Efeito da incorporação de farinha de larvas de mosca soldado negra e Chlorella vulgaris na dieta de galinhas poedeiras sobre a produtividade e a qualidade e características sensoriais do ovo. Lisboa: ISA, 2024, 70 p. Dissertação de Mestrado
Editora
Instituto Superior de Agronomia, Universidade de Lisboa