Influence of low-protein diet with different levels of amino acids on laying hen performance, quality and egg composition

Abstract

The present study aimed to investigate the consequences of dietary levels of crude protein (CP) and total sulfur amino acids (TSAA, Met+Cys) on productive performance, egg quality and egg components for Lohmann Brown laying hens through 18-34 weeks of age. A 2×3 factorial design experiment was conducted using two levels of CP (16 and 18 %) and three levels of Met+ Cys (0.67, 0.72 and 0.77 %). A total of 144 Lohmann Brown laying hens at 18 weeks of age were randomly divided into 6 treatment groups. The best values of fi nal body weight and body weight change were recorded by the hens fed 18 % CP diet. Increasing dietary CP up to 18 % accompanied with the best (P> 0.01) feed conversion, egg weight and egg mass. The combination between low-CP diet (16 %) and 0.72 % Met+ Cys gave the best percentage of egg production. The majority of egg quality traits were not signifi cantly altered by dietary treatments. The interaction between CP and Met+Cys levels had a statistical (P>0.01) impact on egg content of moisture and total solids only. It could be concluded that the best production criteria could be obtained by using 0.72% Met+Cys. Moreover, dietary level of 16 or 18 % CP with 0.72% Met+Cys is recommended for feeding Lohmann hens.

Amino acid requirements for laying hens: a comprehensive review

“…Inconsistent results stemming from dietary CP reductions on layer performance have been reported where some studies did not find impaired performance ( Liang et al., 2005 ; Gunawardana et al., 2008 ; Novak et al., 2008 ) while others reported underperformance in comparison to control diets ( Halle 2002 ; Valkonen et al., 2006 ; Alagawany et al., 2020 ). A lack of attention on protein digestive dynamics in reduced-crude protein layer diets which is important because they are supplemented with higher levels of nonbound amino acids has been observed.…”

Supplementation of different zinc sources to low-CP diets and its effect on performance, carcass traits, liver and kidney functions, immunological, and antioxidant parameters of quail chicks

“…However, Dowarah and Sethi (2014) reported that using different dietary CP levels during the periods (starter-23, 25, and 27%) and (finisher-18, 20, and 22%) had no effect on the growth performance of quails. A low protein diet supplemented with some amino acids improves the growth performance of quails, and it is a good strategy for reducing ammonia emissions and nutritional costs ( Alagawany et al, 2014 , 2016 , 2020 ; Attia et al, 2017 ). The use of synthetic or natural feed additives in diets containing low CP enhanced the feed conversion rate ( FCR ), growth, carcass traits, economic feasibility, and nitrogen retention of poultry ( Rehman et al, 2018 ).…”

Effect of dietary serine supplementation on performance, egg quality, serum indices, and ileal mucosal immunity in laying hens fed a low crude protein diet

“…Previous studies reported that dietary CP reduction was associated with poor egg production and feed efficiency of layers ( Roberts et al., 2007 ; Azzam et al., 2017 ; Alagawany et al., 2020 ), which can be imputed to the imbalance of AA composition in LCP diets ( Keshavarz and Jacson, 1992 ). In the current study, the unobvious differences in HDEP and F/E between the LCP treatment (14.05% CP) and the control (16.49% CP) might because that the LCP diet was well fortified with EAA, including Lys, Met, Met + Cys, Thr, Trp, Val, Ile, and Leu.…”