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New Products and Research

Influences of Dietary Energy on Performance and Egg Composition of Bovans
White and Dekalb White in Phase I. Full Article

Abstract: A 4 × 2 factorial experiment with four dietary energy levels (2719, 2798, 2877 and 2959 kcal/kg) and two strains (Bovans White and Dekalb White) was conducted to determine the influence of dietary energy on reproductive performance, egg composition, and profits of two strains of commercial leghorns. This experiment lasted 16 weeks. Bovans White hens (n = 768) and Dekalb White hens (n = 768) in Phase I (21 weeks of age) were randomly divided into 8 treatments (16 replicates of 12 birds per treatment). Bovans White had significant higher feed intake, egg production, egg mass, body weight, percent egg yolk, and Yolk/Albumen ratio than Dekalb White, while Bovans White had significant lower feed conversion, egg weight, egg specific gravity, percentage of albumen weight, percentage of shell weight, and Haugh unit than Dekalb White. When dietary energy level increased from 2719 to 2956 kcal/kg, hens adjusted feed intake from 107.6 to 101.1 g/hen/day so that the same amount of dietary energy (5.8 kcal) was used to produce one gram egg. Increasing dietary energy by the addition of poultry oil increased early egg weight, which appeared to be due to increased yolk weight. Increasing dietary energy by the addition of poultry oil significantly decreased feed conversion and egg specific gravity, but had no effect on egg production, egg mass, body weight and mortality. Therefore, increasing dietary energy by the addition of poultry oil had positive effects on performance in both Bovans White and Dekalb White fed the corn-soy diets in Phase 1. Based on egg weight, increasing dietary energy by the addition of poultry oil at a 282 energy/lysine ratio had maximum performance of laying hens in Phase 1, but may not get optimal profits because egg price and poultry oil price are variable.

Key words: strains, energy, egg composition, egg weight, feed intake

Full Article 

 

Current Research

Influences of Dietary Energy on Performance and Egg Composition of Bovans White and Dekalb White in Phase I. (104Kb PDF file)

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Archived Research

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