Analele Universităţii din Craiova, seria Agricultură – Montanologie – Cadastru (Annals of the University of Craiova - Agriculture, Montanology, Cadastre Series)Vol. XLIV 2014 63 INFLUENCE OF FEEDINGON THE WEIGHT OF BROILER CHICKENS M COLĂ, FLORICA COLĂ Keywords: amino acids, combined fodder, carcasses, protein-energy level ABSTRACT As compared to the results obtained, it is recommended for the practical application during 1-45 days a feed of 2900 kcal E.M./kg combined fodder having 21 % P.B. with 1,1 % lysine and 0,450 % methionine and with a protein-energy ratio of 139. At 45 days the chickens gained on average a body weight of 1178 g with a consumption of 2,2 kg combined fodder per 1 kg gain in live weight. For the finishing period 46-60 days it is recommended the feed of 3100 kcal/kg of combined fodder with 19 % P.B., having 0,920 % lysine and 0,410 % methionine and a protein-energy ratio of 163; with the help of this feed it has been obtained, in that period, an average gain of 0,582 kg, with a consumption of 2,35 kg combined fodder per kg gain. INTRODUCTION Among the factors which contribute to get better results in poultry farm a very important role is held by rational feeding. To this effect it is necessary to be taken into account the nutritive requirements, to ensure a high production, a better capitalization of feed and a normal sanitary condition of the poultry. In order to control the requirementsof energy and protein, quantitatively, as well as the ratio of the content of amino acids, it is necessary to know both the energy-protein level and the optimum doses of amino acids for different categories of poultry. A positive influence on the increase of weight gain has been found also by supplementing with lysine and methionine the nutrients for chickens in order to balance feeds. MATERIAL AND METHOD The researches were carried out at S.C. VITALL S.R.L. Coșoveniin the year 2013, being followed the need ofenergyand amino acidsin Cornish-Rock broilers, on a flock of 640 broilers,divided into 2 experimental groups. Within each group there have been formed 10 variants, each variant having 32 broilers. Within the groups it was studied, during the rearing and fattening of chickens, (1-45 days) and during the finishing period (46-60 days), 2 energy-protein levels different and balanced in amino acids, considered as control group, and inside each group have been experimented 10 variants, where lysine andmethioninehave been decreased or increased as compared to the control group by 10-20 %, single or associated, according to thescheme in table 1. Table 1 Scheme of the experience Experi mental group Varia nt Protein level, energy and amino acidsduring the period of rearing and finishing 0 – 45 days 46 – 60 days 1 NB lysine reduced by 10 % NB lysine reduced by 10 % 2 NB methionine reduced by 10 % NB methionine reduced by 10 % 3 NB lysine and methionine reduced by 10 % NB lysine and methionine reduced by 10 % 4 Basic feed 2900 kcal EM/Kg combined Basic feed 3100 kcal EM/Kg combined brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by Annals of the University of Craiova - Agriculture, Montanology, Cadastre Series