Abstract
The objective of this experiment was to evaluate levels of methionine + cystine levels for broiler breeders from 40 to 60 weeks of age. It was used 288 Cobb broiler breeders, distributed in a randomized experimental design with six levels of methionine+ cystine in the diets (0.39; 0.47; 0.55; 0.63; 0.71 and 0.79%), eight repetitions and six breeders per experimental unit. The diets were isocaloric and isoprotein (2,850 kcal ME/kg and 12.58% CP) and oferred at a fixed amount (155 g) per bird. For the entire studied period, by using polynomial analysis, it was observed a quadratic effect of methionine + cystine levels on the percentage of egg production, on number of eggs per hen housed, on number of eggs per hen and egg weight. There was also a linear effect on shell weight when it was calculated in relation to egg weight. The total methionine + cystine requirement for broiler breeders was calculated at 0.521% for percentage of egg production and number of eggs per hen, which corresponds to a daily intake of 808 mg of methionine + cystine/day. The digestible methionine + cystine requirement for broiler breeders was estimated at 727 mg for laying percentage and number of eggs per hen.
Highlights
Broiler breeder rearing is characterized by utilization of specialized birds with high genetic potential
All parameters for the assessment of egg production were affected by the concentration of methionine + cystine in the experimental diets (Table 2)
Value similar to the average weight of 4.08 kg obtained at the end of this experiment was reported by Lopez & Leeson (1995), who studied the effects of diets with different levels of protein supplemented with synthetic amino acids, so as to maintain constant levels of methionine + cystine and lysine in broiler breeders during the breeding season and observed with a diet of 14% CP, average body weight of 4.11 kg in birds at 60 weeks of age
Summary
Broiler breeder rearing is characterized by utilization of specialized birds with high genetic potential. Quadratic effect was observed for percentage of posture, number of eggs per bird housed and number of eggs per bird, considering the average values of all experimental period.
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