Optimizing dietary amino acid profile of laying Japanese quails during 6-14 weeks of age

Sarabmeet Kaur, A. B. Mandal and K. B. Singh
Central Avian Research Institute, Izatnagar - 243 122 (UP)

An experiment was conducted to assess the requirements of critical amino acids of laying quails. For this purpose 312 laying quails were divided into 156 groups of two quails each at 6 th week of age. Six dietary treatments were formulated using three levels of amino acids (85, 100, 115% of NRC, 1994) with and without fishmeal (3 x 2 factorial design). Each dietary treatment was offered to 26 groups of quails (i.e. 52 per treatment) from first day of 6 th week of age. The data of feed intake, egg production, body weight changes and egg quality parameters were recorded and compiled from first day of 7 th week to the end of 14 th week of age. Hen-day or hen-housed egg production did not differ (P>0.05) due to amino acid (AA) levels, protein type or their interaction. Egg weight improved linearly (P< 0.01) with the increased AA levels, while egg mass was lower (P< 0.01) at 85% than in 100 or 115% AA level. Feed intake per kg egg mass remained similar in groups fed 100 and 115% AA levels while it was poorer (P< 0.01) at 85% level. Feed intake per dozen eggs was, however higher at 115% AA level. The gain in body weight during laying period was higher in 100 and 115% level than in 85% AA level. The feed cost of production of dozen eggs increased linearly (P< 0.01) with the increase in AA levels, and that for egg mass did not differ between 85 or 100% level, while it was higher (P< 0.01) at 115% AA level. The shape index, albumen index, yolk index and color did not differ statistically either due to AA level, protein type or their interaction. Shell thickness reduced at 85% level, while it improved and remained similar in 100 and 115% AA levels. IQU differed due to interaction of AA levels and protein type. Results indicated that the amino acid profile suggested by NRC (1994) was optimum for laying quails during 6-14 weeks of egg production.

Source : IPSACON-2005

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