<b>Performance of Japanese quails fed diets with low-protein and isoleucine

Abstract

Aiming to assess isoleucine levels in low protein diets for laying Japanese quails, 648 quails of 182 days of age were distributed in experimental block design with six treatments and six replicates of 18 birds each. Treatments consisted of a basal level corresponding to 0.672% isoleucine and supplemented with isoleucine to the levels of 0.816, 0.960; 1.104; 1.248%. The experimental diets were compared to a control diet containing 20% CP. The parameters studied were: performance, egg quality, total solids and nitrogen in the excreta. There was a linear increase only for isoleucine intake with increasing levels of isoleucine in the diets. The comparison of mean values of each combination of isoleucine levels for diets with 16% CP with the control with 20% CP showed that the intake of CP and isoleucine, egg weight, nitrogen excretion and yolk color were significantly affected. For Japanese quail fed diets with 16% CP, with isoleucine level at 0.672%, meets the requirements for obtaining satisfactory performance and egg quality and promoted a reduction in nitrogen excretion.

Effects of Dietary Protein Level and Betaine Supplementation on Nutrient Digestibility and Performance of Japanese Quails

“…This result is in agreement with previous findings (Li et al, 2011;Ratriyanto et al, 2014b;Dos Santos et al, 2016).…”

“…Dietary CP levels did not affect feed intake or egg production, but the19.5% CP diet improved feed conversion ratio (p<0.05). These results are in agreement with those of Dos Santos et al (2016), who did not find any significant effect on feed intake or egg production of quails fed 16 or 20% CP. In addition, previous observations in Japanese quails determined that increasing dietary CP from 17 to 20% (Tuleun et al, 2013) or from 15 to 20% (Muhammad et al, 2016) did not affect egg production, but did improve feed conversion ratio.…”

“…The reduction (p<0.05) of PER with increasing dietary CP levels may be attributed to higher CP intake (Dos Santos et al 2016), as high-protein diets increase protein excretion, resulting in lower PER. This result is in agreement with previous findings (Li et al, 2011;Ratriyanto et al, 2014b;Dos Santos et al, 2016).…”

Effects of Different Methionine Levels in Low Protein Diets on Production Performance, Reproductive System, Metabolism, and Gut Microbiota in Laying Hens

“…There have also been studies on livestock and poultry that have shown that adding certain synthetic amino acids to a low protein diet can improve protein digestibility, effectively reduce nitrogen emissions (11,14), and save feed costs (15,16). Many studies have shown that adding a certain amount of glycine, valine, isoleucine, and methionine (Met) to a low protein diet has no negative effect on livestock and poultry and can even improve their performance in some way (17)(18)(19).…”

Performa Produksi Ayam Ras Petelur yang Diberi Azolla microphylla Terfermentasi dengan Lentinus edodes dalam Ransum

“…Fenita dan Kaharuddin (2011) menyatakan bahwa produksi telur dipengaruhi oleh asam amino lisin, metionin dan triptopan. Ditambahkan oleh Santos et al (2016) bahwa protein yang terkandung pada telur berasal dari asam amino yang dikonsumsi, oleh karena itu produksi telur sangat dipengaruhi oleh ketersediaan asam amino pada pakan. Tugiyanti et al (2017) menyatakan bahwa kandungan asam amino dibutuhkan untuk sintesis protein pada albumin telur.…”