ABSTRACT
Avaliou-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.
The effect of increasing levels of organic minerals on the external and internal quality of eggs and tibia bone strength of brown-egg laying hens was studied. A total of 256, 30-week old was equally distributed in 64 cages in a total of four birds per cage in a completely randomized experimental design. The dietary treatments consisted of inorganic or increasing levels of organic minerals in the diets of laying hens, resulting in four treatments. Egg weight (g), specific gravity, shell weight and thickness (mm), albumen height (mm), Haugh unit, yolk weight and albumen (g) and bone strength (kg) were evaluated. A significant difference (P<0.05) among treatment means for egg weight and albumen was found. Intermediate inclusion levels of organic minerals resulted in the production of heavier eggs, with higher albumen weight and maintenance of the other characteristics of internal and external quality of eggs and bone strength.
Subject(s)
Animals , Minerals , Bone and Bones/anatomy & histology , Eggs/analysis , Chickens/classificationABSTRACT
1. This study evaluated the effects of diets with partial and total substitution of soya bean oil (SO) with flaxseed (linseed) oil (FO) on broiler chicken performance, carcass traits, meat chemical composition and blood serum metabolites. 2. A total of 448 one-d-old Cobb 500 broiler chicken were used. They were allotted among 4 treatments with 8 replications, using a completely randomised design, for 35 d. Four diets were compared: T1 = 100% SO (3%, 1-7 d; 4%, 8-21 d; and 5%, 22-35 d); T2 = 50% SO + 50% FO; T3 = 25% SO + 75% FO and T4 = 100% FO. 3. No significant differences were observed in body weight (BW), body weight gain (BWG), feed intake (FI), feed conversion ratio (FCR) and blood serum metabolites (total triglycerides, TRI; total cholesterol, CHO; high-density lipoprotein, HDL; low-density lipoprotein, LDL; glucose, GLU; albumin, ALB; globulin, GLO; and total proteins, TPs). Significant effects were observed for TRI, CHO, HDL, GLU, HDL, LDL, ALB and GLO with regard to the day of collection. 4. Carcass traits did not show significant differences for the treatments. No significant differences were observed for breast and drumstick chemical compositions, with the exception of drumstick fat concentration (quadratic effect). 5. In conclusion, the partial or total substitution of SO with FO did not affect growth performance, carcass traits, meat chemical composition or blood serum profile in broiler chicken. Therefore, FO can be an alternative to SO in the diet formulation for broiler chicken.
