Avaliação do desempenho e qualidade dos ovos de poedeiras comerciais, submetidas a dietas à base de sorgo-soja

• Ano de defesa: 2005
• Autor(a) principal: Moreno, Jarier de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Zootecnia; Sorgo; Sorghum; Desempenho; Ovos - Qualidade; Poedeiras; Performance; Eggs - Quality
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/18751

The experiment was designed to study the effect of the substitution of the corn for sorghum, with and without addition of a natural pigment, in diets for lying hens, on performance and quality of the egg. One hundred and sixty Hy-Line White Leghorns hens with 47 weeks of age, were distributed in a completely randomized design, with four repetitions of eight birds, totalizing 32 birds per treatment. The diets were isoenergetics, isoproteics and isoaminoacidics, based on corn, soybean meal and sorghum, supplemented or not with natural pigmentant. The reatments were: T1 - diet with 100% of corn as energy cereal; T2 - diet with 50% of corn and 50% of sorghum without natural pigment; T3 - diet with 50% of maize and 50% of sorghum with natural pigment; T4 - diet with 100% of sorghum without natural pigment; T5 - diet with 100% of sorghum with natural pigment. The experiment was held for 112 days divided in four periods of 28 days each. The ariables studied were: performance – egg production (% hen/day), feed intake (g/bird per day), feed: gain ratio (kg feed/kg egg) and egg weight (g); Quality egg – eggshell (%), egg-albumen (%), egg-yolk (%) and yolk color (fan Roche); feed cost. Analysis of variance showed that the egg production was significantly lesser (P<0,05) in the diet with 100% of sorghum with natural pigment, when compared to the other treatments. How much to the pigmentation of the egg yolk, T1 diet presented highest pigmentation (P<0,05), when compared with T2 and T4. Moreover, the pigmentation of the egg-yolk was significantly highest (P<0,05) in the T3 in relation to the T2, as well as in the T5 in relation to the T4. The production cost suggested that the replacement for 100% of corn by sorghum and addition of natural pigment increased the production cost of one kilogram of egg, with good acceptance of consuming market. In conclusion, the partial and total substitution of the corn for sorghum did not affect the characteristics of performance (except egg production), and egg quality of lying hens and the inclusion of the natural pigment in the rations with sorghum skirted the problem of the pigmentation egg yolk.