Effect of energy levels of diets formulated on total or digestible amino acid basis on broiler performance

Abstract

This study was conducted to evaluate the performance and carcass and breast yields of broilers fed two different energy levels (3,200 or 2,900 kcal ME/kg) and two ways of expressing amino acid requirements (total TAA or digestible DAA) between 21 and 42 days of age. The results showed that broilers fed the diet containing 3,200 kcal ME/kg had higher weight gain (P=0.015), better feed conversion (P=0.001), and higher abdominal fat deposition (P=0.001) as compared to those fed the diet containing 2,900 kcal ME/kg. Diets formulated on DAA basis promoted higher weight gain (P=0.043), better feed conversion (P=0.010) and better conversion of ME intake into weight gain (P=0.007) as compared to those formulated on TAA basis. The results of this study suggest that formulation based on DAA is necessary if the diets contain protein sources that are not reliable in terms of amino acid digestibility. The response to formulation based on DAA was minimized when birds received the low energy level diet (2,900 kcal ME/kg).

Growth performance, carcass characteristics and blood metabolites of broiler chickens fed diets formulated on total or digestible amino acids basis with bovine bile salts powder and soybean oil

“…These results are in consistent with the findings of Maiorka et al (2004) and Fernandez et al (1995) who reported that feed efficiency was improved in broilers fed diets formulated on DAA than TAA basis. Improved feed efficiency in DAA fed birds is due to more balanced nutrients, absorption and protein synthesis which was influenced by the diet formulated based on DAA (Khaksar and Golian, 2009).…”

“…In addition, recent interest in poultry feed formulation has led to take into account the digestible amino acids rather than total (Khaksar and Golian, 2009). In this regard, there have been a number of papers demonstrating the advantages of using digestible rather than total amino acids to formulate broiler diets (Maiorka et al, 2004(Maiorka et al, , 2005Farrell et al, 1999). However, no reports on the interaction between this method of amino acid formulation and the use of soybean oil with dietary bile salts found in broiler chickens.…”

Effect of dietary energy level on growth performance and morphometric parameters of local barred chickens at the starter phase

“…The improvement in response to dietary energy during the starter phase were further shown by the reports of Maiorka et al (2004) who observed improved body weight and FCR with increased dietary energy in the starter period. The present result disagrees the reports of Nguyen and Bunchasak (2005) The economic evaluation shows that the mean feed cost necessary to produce a kg of body weight is significantly (P<0.05) lower in D1 as compared to D0, D2 and D3.…”

Metabolizable Energy Levels for Meat-Type Quails at Starter Phase

“…Nevertheless, based on its influence on feed intake, excessive dietary energy supply may limit nutrients intake (e.g. amino acids) and consequently compromise bird performance (Maiorka et al, 2004). In the current study, increasing in dietary AMEn decreased protein and lysine intake, which might explain the quadratic responses observed on FBW and WG.…”