Estimation of lysine requirements for growing Japanese quails

Abstract

This study was conducted to estimate the lysine requirements of growing meat-type Japanese quails based on different growth responses using different regression models. Experimental treatments including five doses of dietary lysine (9.40, 10.9, 12.4, 13.9 and 15.4 g/kg of diet) were used in a dose-response platform from 7 to 21 day of age. A total of 375, 7-day old quail chicks were randomly allotted to one of five dietary treatments with five replicate pens and 15 birds per pen. Performance traits including feed intake (FI), weight gain (G) and feed:gain (F:G) and carcass criteria including dressing (DRS), breast meat yield (BMY) and leg meat yield (LMY) were measured and used to fit several models (e.g., spline and quadratic polynomial models). Except FI and LMY, other parameters responded to dietary treatments (p < .05), in which G linearly but F:G, DRS and BMY quadratically responded to incremental levels of lysine (p < .05). On the basis of statistical merit, the best estimation of lysine requirements for G, F:G, BMY and DRS was 12.39 (R : .93 and S : 2.35), 12.40 (R : .98 and S : 0.001), 13.64 (R : .99 and S : 0.15) and 13.80 (R : .99 and S : 0.50) g/kg of diet respectively. This study showed that lysine requirements for maximum carcass yield and its attributes (e.g., BMY) might be higher than those needed for maximum growth rate or feed efficiency.

Physiological and statistical aspects of immunoregulatory and antioxidant properties of tryptophan

“…As usual, all protein-containing feed ingredients of basal diet and mixed experimental diets were analyzed for CP method 990.03, 37 and amino acid pro le method 982.30, 37 before beginning the experiment. As described by Hasanvand, et al 7 , feed samples were prepared using a 24-h hydrolysis in 6 N hydrochloric acid at 110°C under an atmosphere of nitrogen. For Met and Cys, performic acid oxidation was done before acid hydrolysis.…”

“…The continuous data need to be tted by regression models either with linear or quadratic patterns. Among different mathematical models, broken line models are the most prevalent models for determination of nutrient requirements in mammals and poultry [6][7][8][9][10][11][12][13][14] . In general, the broken line models consisted of one or two slope sections and each section may follow the linear and/or quadratic manners in ascending and/or descending orders 6-8, 15 .…”

Apparent and standardized ileal amino acid digestibilities of corn, wheat, soybean meal, and corn gluten meal in quail chicks

“…As described by Hasanvand et al (2018) , feed samples were prepared using a 24-h hydrolysis in 6 N hydrochloric acid at 110°C under an atmosphere of nitrogen. For Met and Cys, performic acid oxidation was done before acid hydrolysis.…”

Second-limiting amino acid in corn-soybean meal based diets for Japanese quail

“…Lys deficiency in early life reduced breast muscle development (Tesseraud, et al 1996) and increased protein degradation in the pectoralis major muscle during the growth period (Tesseraud, et al 2009). Hasanvand, et al (2017) observed that levels below 1.24% Lys, limited the development of quails.…”

“…Lima, et al (2016) suggested that the ideal Lys level to optimize the growth (1-40 days) of Japanese quail was 1.20%. Hasanvand, et al (2017) observed that levels below 1.24% Lys, limited the development of quails.…”