Abstract
A study was conducted to determine the effects of diet formulation type on egg characteristics and reproductive performance of broiler breeder (50 to 64 weeks of age). 140 female and 20 male breeders in four treatments with five replicates (7 females : 1 male) were used in the randomized 2 × 2 factorial design. Four experimental diets were formulated based on two factors: two levels of apparent and true metabolizable energy corrected for nitrogen of feedstuffs (AMEn and TMEn) and two levels of total amino acids (TAAF) and digestible (DAAF) feedstuffs. The results show that egg weight, egg production, fertility and hatchability were significantly different and affected by diet formulation based on energy (P<0.05). Diet formulation based on digestible amino acids of feedstuffs significantly increased albumen height and Haugh unit (HU). Hens on treatment 2 (AMEn + DAAF) were significantly different in egg weight (69.17 g), egg production (62.45%) and chicks/hen (40.23) (P<0.05). This study shows that the diets formulations for AMEn, TMEn, TAAF and DAAF have significant effects on egg characteristics and broiler breeders reproductive performance. Key words: Broiler breeders, reproduction, amino acids, fertility, chickens.
Highlights
Current recommendation for diet formulation for broiler breeder hens is expressed as daily nutrient intakes based on apparent metabolizable energy (AME) and total amino acids (TAAF) rather than true metabolizable energy (TME) and digestible amino acids (DAAF) of feedstuffs
Four experimental diets were formulated based on two factors: two levels of apparent and true metabolizable energy corrected for nitrogen of feedstuffs (AMEn and TMEn) and two levels of total amino acids (TAAF) and digestible (DAAF) feedstuffs
This study shows that the diets formulations for AMEn, TMEn, TAAF and digestible amino acids of feedstuffs (DAAF) have significant effects on egg characteristics and broiler breeders reproductive performance
Summary
Current recommendation for diet formulation for broiler breeder hens is expressed as daily nutrient intakes based on apparent metabolizable energy (AME) and total amino acids (TAAF) rather than true metabolizable energy (TME) and digestible amino acids (DAAF) of feedstuffs. Energy and amino acids are the most important factors in broiler breeder hen’s diet. Total amino acids are still used for poultry diets formulation and to express requirements. Not all amino acids in the feed are available for maintenance and production. The part of amino acids that is not digested can differ very much between feeds. Crude protein is used as a measure of the amino acid content of the feed. If feed is formulated to contain sufficient levels of these amino acids, egg production, fertility, egg size and metabolism will be optimized. To adjust poultry diets with digestible amino acids of feedstuffs is better and easier to meet birds’ real
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