EFFECT OF VARYING DIETARY CRUDE PROTEIN AND TRYPTOPHAN LEVELS ON PRODUCTION PERFORMANCE OF WHITE LEGHORN BIRDS
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Date
2019
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POULTRY RESEARCH STATION COLLEGE OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY ANAND AGRICULTURAL UNIVERSITY, ANAND
Abstract
The present study was conducted in White Leghorn layer birds from 21-40 weeks of age to evaluate effect of varying dietary crude protein and tryptophan levels on production performance. The study was conducted at Poultry Research Station, College of Veterinary Science and Animal Husbandry, Anand Agricultural University, Anand. A total of 192 White Leghorn pullets of uniform were selected and distributed into eight treatments groups each with four replicates and each replicate having six birds and placed in individual California cages. Eight iso-caloric (2600 ME kcal/kg feed) treatment diets were formulated having two level of crude protein i.e. 14 and 16% each with four levels of tryptophan i.e. 0.17, 0.19, 0.21 and 0.23% and constant level of Lysine (0.80%), Methionine + Cysteine (0.70%) and Threonine (0.64%). Synthetic L-Tryptophan were supplemented at the rate of 30, 50, 70 and 90 g/100 kg feed in 14% crude protein diet and 00, 20, 40, 60 g/100 kg feed in 16% crude protein diet to achieve 0.17, 0.19, 0.21 & 0.23% tryptophan levels, respectively. DL-Methionine and L-Lysine were also supplemented to maintain their constant dietary levels in feed. The performance in terms of hen day egg production (HD%), hen day egg number (HDEN), hen housed egg number (HHEN), egg weight (g), egg mass (g per hen per day), feed intake (g/bird), feed intake (g/egg), feed efficiency (g/g egg mass), feed cost (Rs./egg), body weight (g) and egg quality parameters were studied.