Renata de Souza Reis

Níveis de treonina digestível em dietas para codorna japonesa em postura

The experiment was carried out to estimate the level of digestible threonine for laying japanese quail during 63 days. A total of 400 japanese quails, with inicial age of 57 days were allotted to a complete randomized experimental design with five treatments, eight replicates and ten birds per experimental unit. The basal diet, deficient in threonine and with 20% C, 2,910kcal ME/kg, was supplemented with five levels of L-threonine 98% (0.018, 0.074, 0.128, 0.183, and 0.239%), corresponding to digestible threonine: digestible lysine ratios 0.65, 0.70, 0.75, 0.80, and 0.85, respectively, to compose the experimental treatments. The characteristics evaluated were: feed intake, threonine intake, egg production, production of commercial eggs, egg weight, egg mass, feed conversion per egg mass, feed conversion per egg dozen, egg quality (yolk, albumen and shell), egg length and width and specific gravity. Linear effect was only observed in the threonine intake. In conclusion, to provide the best performance results and of the quality of eggs, the Japanese quail does not require more than 0.65% of digestible threonine for a intake of 149.2 mg of digestible threonine/day or a daily intake of 14.34 mg of digestible threonine/g egg, corresponding to the digestible threonine: digestible lysine ratio of 0.65.

Digestible lysine levels in diets for laying Japanese quails

The objective of this study was to estimate the digestible lysine requirement of Japanese quails in the egg-laying phase. A total of 336 female Japanese quails (Coturnix coturnix japonica) of average initial age of 207 days were distributed in a completely randomized experimental design, composed of 6 treatments (lysine levels) with 7 replicates and 8 birds per experimental unit, with duration of 84 days. Experimental diets were formulated from a basal diet, with corn and soybean meal, with 2.800 kcal ME/kg and 203.70 g/kg crude protein, showing levels of 9.50; 10.00; 10.50; 11.00; 11.50; and 12.00 g/kg digestible lysine; diets remained isoprotein and isocaloric. The following variables were studied: feed intake (FI); lysine intake (LI); egg production per bird per day (EPBD); egg production per bird housed (EPBH); production of marketable eggs (PME); egg weight (EW); egg mass (EM); utilization efficiency of lysine for egg mass production (UELEM); feed conversion per mass (FCEM); feed conversion per dozen eggs (FCDZ); bird availability (BA); percentages of yolk (Y), albumen (A) and shell (S); specific egg weight (SW); nitrogen ingested (NI); nitrogen excreted (NE); and nitrogen balance (NB). Significant effect was only observed for LI, EW, EM, UELEM, FCEM, Y, A and SW. The digestible lysine level estimated in diets for laying Japanese quails is 11.20 g digestible lysine/kg diet, corresponding to an average daily intake of 272.23 mg lysine.