Performance and carcass yield of broilers fed with different digestible amino acid profiles recommended by nutrients requirements tables

Abstract

An experiment was conducted to evaluate the effect of different digestible amino acid profiles on the performance of broilers in two phases: from 1 to 21 days and from 22 to 42 days of age. At the end of the experiment, carcass yield and cut percentages were evaluated. Nine hundred and sixty AgRoss birds were distributed in a randomized block design with four treatments (four digestible amino acid profiles): Rostagno et al. (2000), Baker & Han (1994b), Degussa (1997) and those recommended by AgRoss (2000), with six repetitions and 40 birds per repetition (20 males and 20 females). The results showed that the four diets were able to provide the requirements of the birds, since no significant differences were seen among the treatments on the performance in the two phases and on the carcass yield and cuts at 42 days of age. Males had better yields of feet, head and neck, and lower percentage of abdominal fat (p<0.05). The best cost/benefit ratio was seen for the profile established by Rostagno et al. (2000) when diets were evaluated in an ideal protein situation.

Performance of some broiler strains fed varying energy levles in wet season of semi-arid Sokoto, Nigeria

“…As for the significant difference that was noticed across the three strains in terms of mortality Marshall and Arbor-acre strains were observed to have significantly (P<0.05) higher mortality, compared to Hubbard strain, this agrees with the findings of Serker et al It can easily be understood from these results that; the energy content of the diet does not necessarily affect the water intake of the diet at starter phase of wet season, since the humidity of the environment was high during the rainy season; the demand for drinking water was expected to be low, because the low energy diet that was supposed to record the highest water intake was observed to have the lowest water intake, similarly the medium energy diet that was supposed to record the medium water intake, recorded highest water intake, this further explained why there was no significant difference in terms of feed intakes across different energy levels. The highest cost/kg gain observed for those that consumed high energy diet in the current study agrees with the findings of Pederoso et al (2003) that reported significant difference in terms of cost/kg gain of birds fed different amino acid profiles.…”

Productive, physiological and immunological responses of two broiler strains fed different dietary regimens and exposed to heat stress

“…In the literature, a significant relationship between dietary protein levels and the genetic makeup required for the optimum production of chickens have been reported (Razuki and Al-Rawi 2007;Attia et al 2010aAttia et al , 2010bAttia et al , 2016. Dietary protein and thus amino acid requirements differ based on the age of the chicken, the goal of production, dietary metabolisable energy (ME), environmental conditions, sex, age and feed intake (Pedroso et al 2003;Corrêa et al 2006;Razuki and Al-Rawi 2007;Attia et al 2010aAttia et al , 2010bAttia et al , 2016. Under thermoneutral conditions, average daily gain, feed intake and utilisation were similar among different CP concentrations (18.5, 20.5 and 22.5%) during 14-49 d of age.…”

Digestible Lysine Requirements the Performance, Carcass Traits and Breast Meat Quality of Slow-Growing Broilers

“…Lysine is the main amino acid taken into account in feed formulations based on the ideal protein concept, where the requirements of other amino acids are estimated in proportion to lysine (Pedroso et al, 2003). Therefore, determining the proper lysine requirement is essential for the formulation efficient feeds, with no limitations or excess of amino acids.…”