article · Agriculture
This study evaluated the effects of feeding broiler chickens reduced crude protein diets combined with amino acid supplementation during hot summer conditions. A total of 480 one-day-old Cobb 500 chicks were tested across three feeding regimes: a standard protein and amino acid control, a low-protein diet with optimal amino acid levels, and a low-protein diet with elevated amino acid levels. Birds fed the low-protein diet with optimal amino acid levels achieved the highest body weight. Conversely, broilers given the low-protein diet with high amino acid supplementation recorded the lowest body weight alongside the highest liver levels of malonaldehyde. Carcass dressing percentages and blood plasma proteins, including albumin and globulin, were not significantly altered by lower dietary protein. The results indicate that dietary protein can be decreased without adverse impacts on growth or liver markers, provided amino acids are not supplemented in excess.
High ambient temperatures and humidity regularly challenge poultry growth and physiological health. Showing that crude protein in feed can be safely reduced without harming growth or carcass yield provides poultry producers with clear dietary management options during summer conditions. It also demonstrates that over-supplementing amino acids in low-protein feeds can actively harm bird performance and liver markers.
The findings are relevant to poultry feed manufacturers and broiler farmers seeking to optimise feed formulations for hot climates. As an applied study tested on 480 chicks, the nutritional approach shows direct practical potential. However, the abstract contains no commercial scale trials, cost evaluations, or implementation guidelines, suggesting the research requires operational validation before routine commercial adoption.
AI-generated from the published abstract. Always read the original work before citing.
This study evaluates low protein diets with amino acid supplement on growth, biochemical markers and muscle amino acids profile in broilers under high ambient temperature. A total of 480 one-day-old chicks were allocated into three treatments with four replicates (n = 40). Control fed optimal protein and optimal amino acids which contains 23% and 21% crude protein (CP) with 65% methionine + cysteine/ lysine (Met + Cys/Lys) and 55% threonine/lysine (Thr/Lys), LPOA (low protein and optimal amino acids) which contains 21% and 19% CP with 65% Met + Cys/Lys and 55% Thr/Lys and 3. LPHA (low protein and high amino acids) which contains 21 and 19% CP with 74% Met + Cys/Lys and 67% Thr/Lys, respectively during the summer months (The temperatures 32 ± 3 °C, and the relative humidity 72.5% ± 4). Birds fed LPOA diets significantly highest body weight, while those fed LPHA recorded significantly the lowest body weight (BW). Dressing percentages not revealed significantly affected by reducing dietary protein levels, while the blood plasma total protein, albumin, and globulin were not significant differences due to dietary low protein. Chicks fed LPHA diets recorded the highest liver content of malonaldehyde. It could be concluded that feeding the Cobb 500 broilers on low protein diets with the same amino acid levels had no adverse effect on growth, carcass markers, and liver function, however increased amino acids levels to low protein diets may led negative impacts for the broiler performance under high ambient temperature.
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DOI: 10.3390/agriculture11020185
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