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Acompanhamento de poedeiras comerciais em fase final de postura: Avaliação da qualidade do ovo
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Authors
Advisor(s)
Abstract(s)
O presente estudo teve como objetivo a avaliação da influência da idade de
poedeiras comerciais em final de postura (>70 semanas), sobre parâmetros de produção
(postura e mortalidade) e a qualidade do ovo. Foram selecionados 4 pavilhões/bandos
(ALI, AVI, CAD, GSS) integrados na C.A.C. (Companhia Avícola do Centro, S.A) em
sistema de solo, com a mesma estirpe comercial (ISA Brown) e com a mesma idade. A
avaliação dos parâmetros produtivos foi feita quinzenalmente, nomeadamente às 76, 78,
80, 82 e 84 semanas de idade e a avaliação da qualidade do ovo foi efetuada às 76, 80 e
84 semanas.
Verificou-se diferenças muito significativas (p<0,001) para os parâmetros
produtivos e de qualidade entre os 4 bandos. O bando ALI obteve a maior postura (88,55
% ± 3,37), enquanto o bando AVI registou a menor (79,76 % ± 6,19), comparativamente
aos restantes. Em termos de mortalidade, verificou-se que o maior número médio de aves
mortas pertenceu, respetivamente, aos bandos AVI (19,31 ± 10,24) e GSS (17,46 ± 12,07).
Ao longo do período de estudo, foi possível verificar que existiu uma correlação muito
significativa entre a idade dos bandos e a taxa de postura (%) (p<0,001), verificando-se
uma diminuição desta com o avanço da idade, enquanto a mortalidade (%) aumentou.
Relativamente à qualidade do ovo, verificou-se que as unidades Haugh do bando GSS,
foram as mais baixas (65,18 ± 13,25). Os bandos AVI e GSS, também obtiverem menor
índice de gema, respetivamente, 0,442 ± 0,06 e 0,509 ± 0,19. Relativamente à cor da
gema, os bandos AVI e CAD, demonstraram valores superiores aos restantes bandos
(13,28 e 13,23 respetivamente).
Houve um aumento significativo do peso do ovo (p<0,05), índice de gema
(p<0,05) e pigmentação da gema (p<0,001). Observou-se uma diminuição da qualidade
casca do ovo, traduzida pela diminuição da sua espessura (p<0,001) e resistência
(p<0,05), com o avanço da idade das poedeiras. Apesar de tudo, os valores registados
encontravam-se dentro de intervalos aceitáveis.
Este estudo permitiu ainda, um contacto com a fileira da produção de ovos nos
seus aspetos técnicos, de maneio e de qualidade do produto final.
Palavras-chave: Poedeiras comerciais, idade, final de postura, parâmetros de produção,
qualidade do ovo
The objective of this study was to evaluate the influence of layer age, at end of lay (>70 weeks), on production parameters and egg quality. Four barn flocks (ALI, AVI, CAD, GSS), integrated at C.A.C (Companhia Avícola do Centro, S.A), with the same age and of the same commercial strain (ISA Brown), were selected. The evaluation of the production parameters was done fortnightly, namely at 76, 78, 80, 82, and 84 weeks of age, and the evaluation of egg quality was done at 76, 80, and 84 weeks. There were very significant differences (p<0.001) for the productive and quality parameters between the 4 flocks. The ALI flock obtained the highest rate of lay (88.55 % ± 3.37), while the AVI flock recorded the lowest (79.76 % ± 6.19), compared to the others. In terms of mortality, it was found that the highest average number of dead birds were recorded in the AVI (19.31 ± 10.24) and GSS (17.46 ± 12.07) flocks, respectively. Throughout the study period, it was possible to verify that there was a very significant correlation between flock age and rate of lay (%) (p<0.001), the latter decreasing with age, while mortality (%) increased. Regarding egg quality, the Haugh units of the GSS flock were the lowest (65.18 ± 13.25). The AVI and GSS flocks, also obtained lower yolk index, 0.442 (± 0.06) and 0.509 (± 0.19), respectively. Regarding yolk color, the AVI and CAD flocks showed higher values than the other flocks (13.28 and 13.23 respectively). There was a significant increase in egg weight (p<0.05), yolk index (p<0.05) and yolk pigmentation (p<0.001). A decrease in eggshell quality, translated by a decrease in thickness (p<0.001) and resistance (p<0.05), was observed with the increase of layer age. Nevertheless, the values recorded were within acceptable ranges. This study also allowed a contact with the egg production chain in its technical aspects, management and quality of the final product. Key words: Commercial layers, age, end of lay, production parameters, egg quality.
The objective of this study was to evaluate the influence of layer age, at end of lay (>70 weeks), on production parameters and egg quality. Four barn flocks (ALI, AVI, CAD, GSS), integrated at C.A.C (Companhia Avícola do Centro, S.A), with the same age and of the same commercial strain (ISA Brown), were selected. The evaluation of the production parameters was done fortnightly, namely at 76, 78, 80, 82, and 84 weeks of age, and the evaluation of egg quality was done at 76, 80, and 84 weeks. There were very significant differences (p<0.001) for the productive and quality parameters between the 4 flocks. The ALI flock obtained the highest rate of lay (88.55 % ± 3.37), while the AVI flock recorded the lowest (79.76 % ± 6.19), compared to the others. In terms of mortality, it was found that the highest average number of dead birds were recorded in the AVI (19.31 ± 10.24) and GSS (17.46 ± 12.07) flocks, respectively. Throughout the study period, it was possible to verify that there was a very significant correlation between flock age and rate of lay (%) (p<0.001), the latter decreasing with age, while mortality (%) increased. Regarding egg quality, the Haugh units of the GSS flock were the lowest (65.18 ± 13.25). The AVI and GSS flocks, also obtained lower yolk index, 0.442 (± 0.06) and 0.509 (± 0.19), respectively. Regarding yolk color, the AVI and CAD flocks showed higher values than the other flocks (13.28 and 13.23 respectively). There was a significant increase in egg weight (p<0.05), yolk index (p<0.05) and yolk pigmentation (p<0.001). A decrease in eggshell quality, translated by a decrease in thickness (p<0.001) and resistance (p<0.05), was observed with the increase of layer age. Nevertheless, the values recorded were within acceptable ranges. This study also allowed a contact with the egg production chain in its technical aspects, management and quality of the final product. Key words: Commercial layers, age, end of lay, production parameters, egg quality.
Description
Keywords
Parâmetros de produção Qualidade do ovo Poedeiras comerciais Idade Final de postura