Response of Laying Japanese Quail to Dietary Calcium Levels at Two Levels of Energy
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概要
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An experiment was conducted to assess the dietary levels of calcium at various energy levels in the diets of laying Japanese quail (n=400). Eight dietary treatments were formulated involving two levels of energy (2900 and 2700kcal ME/kg) and four levels of calcium (2.5, 2.75, 3.0 and 3.25%) in 2×4 factorial design. Each dietary treatment was offered to five groups of 10, i.e. 50 laying quail from 9-18 weeks of age. Hen-day egg production, egg weight, feed intake and egg mass were non significant (P>0.05) due to dietary treatments. Feed conversion (P<0.01) in terms of feed per unit egg mass or feed per dozen eggs, and net feed conversion (P<0.01) improved with the increased calcium level up to 3.0% of diet. The shape index, shell thickness or shell weight as percent of egg weight, however, did not change due to the levels of calcium. Except daily feed intake (P<0.01), other traits did not differ due to dietary energy concentration. Regression analyses revealed that egg mass (P<0.00042), egg production (P<0.0094), change in body weight (P<0.042), feed intake/kg egg mass (P<0.0043), feed intake/doz. egg (P<0.0012), net efficiency (P<0.00017) and shell thickness (P<0.054) were improved linearly with the increase in levels of calcium in diet. On partitioning of calcium and ME intake into maintenance, gain and egg mass, the R<SUP>2</SUP> value emanated for partitioning of calcium and metabolizable energy were highly significant (P<0.0001) and the co-efficient values for different function were also logical. It can be concluded that the dietary level of 2700kcal ME/kg and 3.0% calcium were beneficial for optimum production of quail during their peak production.
- 日本家禽学会の論文
日本家禽学会 | 論文
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