Abstract
The present study aimed to investigate the consequences of dietary levels of crude protein (CP) and total sulfur amino acids (TSAA, Met+Cys) on productive performance, egg quality and egg components for Lohmann Brown laying hens through 18-34 weeks of age. A 2×3 factorial design experiment was conducted using two levels of CP (16 and 18 %) and three levels of Met+ Cys (0.67, 0.72 and 0.77 %). A total of 144 Lohmann Brown laying hens at 18 weeks of age were randomly divided into 6 treatment groups. The best values of final body weight and body weight change were recorded by the hens fed 18 % CP diet. Increasing dietary CP up to 18 % accompanied with the best (P> 0.01) feed conversion, egg weight and egg mass. The combination between low-CP diet (16 %) and 0.72 % Met+ Cys gave the best percentage of egg production. The majority of egg quality traits were not significantly altered by dietary treatments. The interaction between CP and Met+Cys levels had a statistical (P>0.01) impact on egg content of moisture and total solids only. It could be concluded that the best production criteria could be obtained by using 0.72% Met+Cys. Moreover, dietary level of 16 or 18 % CP with 0.72% Met+Cys is recommended for feeding Lohmann hens.
Highlights
The first an important step to optimize performance and production in poultry is proper nutrition
The objective of this study was to investigate quantitatively describe the effect of dietary levels of crude protein and total sulfur amino acids on productive performance, egg quality and whole egg composition for Lohmann Brown laying hens
Increasing dietary crude protein (CP) up to 18 % accompanied with the best (P> 0.01) feed conversion, egg weight and egg mass comparing with the low CP level
Summary
The first an important step to optimize performance and production in poultry is proper nutrition. Several factors affect productive performance of laying hens. Soybean meal and corn are the main ingredients providing crude protein and energy in commercial poultry diets (Alagawany et al 2016). It is possible to formulate poultry diets which provide a nonprotein nitrogen and minimum excess of amino acids (Alagawany et al 2015). We are unable to formulate diets with very low levels of crude protein that contain optimum levels of essential amino acids (Zeweil et al 2011). It is possible to readily reduce crude protein supply by 15 – 20% using synthetic amino acids supplements if its cost could be economic and applicable (Aarnink et al 1993).
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