Methionine supplementation of low-protein diet and subsequent feeding of low-energy diet on the performance and blood chemical profile of broiler chickens

Abstract

The effects were investigated of supplementing methionine (Met) in a low-crude protein diet (Low-CP+Met) during Days 11–24 post-hatch and subsequent feeding with a low-metabolisable energy diet (Low-ME; –0.31 MJ/kg) during Days 25–42 on the productive performance and blood chemistry profile of broiler chickens. The 1600 broiler chicks were divided into four groups and fed as follows: (1) Control diet; (2) Low-CP (Met deficiency) diet during Days 11–24, then re-feeding with conventional diet; (3) Low-CP+Met diet during days 11–24, then re-feeding with conventional diet; and (4) Low-CP+Met+Low-ME diet (Low-CP+Met diet during Days 11–24, then re-feeding with Low-ME diet). During Days 11–24, the growth performance of the Control group was better than the other groups (P < 0.01), although the Low-CP+Met diet improved bodyweight, feed conversion ratio and improved the protein conversion ratio compare to the Low-CP group (P < 0.01). During the re-feeding phase (Days 25–42), reducing the dietary energy resulted in better growth performance and a better protein conversion ratio and energy conversion ratio than in the Control group (P < 0.05). Triglyceride, very low-density lipoprotein, low-density lipoprotein-cholesterol and total cholesterol in serum were higher, and non-esterified fatty acid was lower in the Control group than those of the Low-CP+Met+Low-ME group (P < 0.05). In conclusion, reducing dietary protein with balanced amino acids during the grower period and subsequent feeding with a low-energy diet promoted productive performance, improved protein utilisation and reduced fat accumulation via increasing lipolysis and/or disruption of the triglyceride transportation in broiler chickens.

The Response of Broiler Chickens to Dietary Soybean Meal Reduction with Glycine and Cysteine Inclusion at Marginal Sulfur Amino Acids (SAA) Deficiency

“…All reduced protein diet groups resulted in higher abdominal fat percentage compared to the SP2 group. This is in agreement with references [31][32][33], who reported increased abdominal fat caused by the reduced protein diet. Increased abdominal fat percentage in our experiment could be because of reduced protein and deficiency of methionine in the diet.…”

Dietary crude protein levels during growth phase affects reproductive characteristics but not reproductive efficiency of adult male Japanese quails

“…Improved knowledge of CP requirements for different animal species and categories through applying the concept of dietary formulations with ideal protein composition to optimize amino acid use is also needed. A decrease of greater than three or four percent in dietary CP, even if the feed meets all the amino acid requirements, may result in low productive performance [ 30 ]. Thus, determining the true dietary CP requirements for male Japanese quails is essential to correctly apply the optimal protein concept to breeder flocks.…”

Effect of Low Dietary Crude Protein, Metabolizable Energy and Ideal Amino Acids Levels on Productive Performance of Broiler Chicks

“…Hai-ming et al, (2015) reported that there were significant higher LBW of broilers chicks at 42 d of age between energy and protein decreasing. Jariyahatthakij et al, (2018) stated that when low CP and energy diets, the addition of Met improved LBW during the day (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24). The LBW of the control group was better than the other groups (P < 0.01).…”

“…Rajendran et al, (2015) showed that the energy and protein of the diet significantly affected BW, cumulative FI and FCR in broiler chickens. Jariyahatthakij et al, (2018) in low CP and energy diets, stated that the addition of Met improved growth performance and FCR during the day (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24). The growth performance of the control group was better than the other groups (P < 0.01).…”