Qualidade de ovos e resistência óssea de poedeiras alimentadas com minerais orgânicos

Abstract

RESUMOAvaliou-se o efeito da utilização de níveis crescente de minerais orgânicos sobre a qualidade externa e interna de ovos e a resistência de ossos da tíbia de poedeiras semi-pesadas. Foram utilizadas 256 aves, com idade inicial de 30 semanas, distribuídas em 64 gaiolas perfazendo quatro aves por gaiola em delineamento inteiramente ao acaso. Os tratamentos consistiram da inclusão de minerais inorgânicos ou níveis crescentes de orgânicos na dieta basal das poedeiras, resultando em quatro tratamentos. Foram avaliados peso do ovo (g), gravidade específica, peso (g) e espessura (mm) da casca, altura do albúmen (mm), unidade Haugh, peso da gema (g) e do albúmen (g) e resistência óssea (kg). Houve diferença significativa (P>0,05) entre as médias para peso do ovo e do albúmen. O fornecimento de dietas suplementadas com minerais orgânicos, em nível intermediário resultou na produção de ovos mais pesados, com maior peso de albúmen, e na manutenção das demais características de qualidade externa e interna dos ovos e de resistência óssea.Palavras-chave: poedeira, peso do albúmen, peso do ovo ABSTRACT The effect of increasing levels of organic minerals on the external and internal quality of eggs and tibia

Chelated Minerals and Limestone Particle Sizes on Performance and Bone Quality of Brown-Egg Layers

“…Similar results to those found in this trial for bone resistance were reported by Nunes et al (2013), who worked with supplementation of increasing levels of Cu, Mn, Zn and Fe proteinates in diets for brown-egg layers in the period from 30 to 70 weeks of age. Conflicting results were published by Carvalho (2013), who described an improvement in bone resistance of layers fed diets containing organic mineral supplementation.…”

“…Similarly, there was no significant effect of either mineral source or limestone particle size on the following variables: tibia weight, length, Seedor index, resistance, deformity and mineral matter (Table 4). The bone is a type of connective tissue formed by an organic matrix, in which microminerals (copper, manganese, and zinc), as enzymatic cofactors, have a fundamental role in its synthesis and a mineral portion, constituted of calcium phosphate (Nunes et al 2013). Therefore, a balanced diet provides the nutrients necessary for formation of bones with quality, resulting in more resistant bones, and decreasing animal loss caused by their fragility, which comes with age.…”

Trace Mineral Sources and Rosemary Oil in the Diet of Brown Laying Hens: Egg Quality and Lipid Stability

“…The dietary of organic selenium inclusion promoted egg gland dilation and the preservation of the ciliary epithelium of the magnum, isthmus, and shell gland, resulting in greater albumen height, Haugh unit, eggshell thickness, and yolk pigmentation index (Attia et al, 2010;Santos, 2010). Positive effects on albumen deposition were also reported by Nunes et al (2013), supplementing laying hen diets with organic trace minerals.…”

“…Layers fed the OTM diet laid heavier eggs compared with those fed ITM when the diet was not supplemented with RO, whereas the lightest eggs were obtained when layers were fed the diet supplemented with OTM and 100 mg kg -1 RO (Table 3). The higher egg weight obtained with OTM supplementation may be a reflex of increased yolk and albumen weights, as a result of better improved nutrient utilization, as observed by Nunes et al (2013) feeding OTM to laying hens. Evaluating replacement levels (33%, 66% and 100%) of inorganic with organic trace mineral sources in the diet of laying hens, Figueiredo Júnior et al (2013) observed higher egg weight at the 33% replacement level.…”

“…However, yolk index decreased as storage period increased, independently of trace mineral source (Table 6). The highest yolk index values found for eggs in the treatment with organic trace minerals are likely linked to increased yolk production due to improved nutrient use during digestion (Nunes et al, 2013). As such, larger yolks have less significant losses as a result of the storage period.…”