Andrea Luciana Dos Santos

Desempenho e qualidade dos ovos de poedeiras comerciais alimentadas com rações contendo diferentes níveis de metionina e lisina

This experiment was carried out to evaluate the effects of levels of methionine and lysine on performance and on the internal and external egg quality of commercial laying hens. It was used 256 Hisex White laying hens at 68 weeks of age, which were individually housed in a complete random design in a 4 o 4 factorial scheme with four levels of lysine (0.482, 0.682, 0.882, and 1.082%) and of methionine (0.225, 0.318, 0.411, and 0.505%) totaling sixteen diets with four replicates with four birds each. Performance was evaluated through the following characteristics: feed intake, consumption of lysine, methionine, crude protein and energy, weight, production and mass of eggs and feed conversion. Internal quality of eggs was evaluated through the characteristics of weight and yolk percentage and by Haugh unit. Birds showed maximal egg production when fed rations with 0.444% of total methionine and 0.872% total lysine. Rating of eggs by their types and internal and external quality of eggs were not influenced by levels of methionine and lysine in the diet.

Growth and Body Composition of Laying Hens under Different Feeding Programs up to 72 Weeks

This study aimed at comparing growth and changes in body composition of laying hens under different feeding programs from hatch to 72 week old. Hens from W36 or Brown lineages were fed 95% (P1 ), 100% (P2 ) or 105% (P3 ) of their nutritional requirements. Six pens (replicates) with 46 hens each were used for each combination of lineage and feeding program. Growth curves were fitted using Gompertz’s model. The highest body growth rate was observed for Brown-hens fed P2 at 8 week old, when the maximum growth rate and maturity rate were achieved. The same lineage of hens fed P3 presented the greatest estimated body weight at maturity. W36 hens had higher deposition of fat and protein throughout the 6th week at maximum growth rate compared to Brown hens. This resulted in W36 hens that reached body weights at maturity faster than Brown hens. Fat deposition occurred at a later age than protein deposition in both lineages and all feeding programs. The present data support the usage of 105% of the declared nutritional requirement for the best growth performance.