THE APPLICATION OF POLYNOMIAL REGRESSIONS IN THE PERFORMING EVALUATION OF LAYING HENS FED WITH FODDERS USING AMINO ACIDS SUPPLEMENTATION

The experiment has been carried out in the Poultry Department from the Didactic Station of Banat`s University of Agricultural Sciences and Veterinary Medicine Timisoara, on 100 laying hens, 32-39 weeks old - the hybrid Shaver 579. We have distributed the hens in 4 groups, with fodder recipes including two protein levels (16.2% and respectively 15.2%) and different amino acid contents. As regarding the egg production weight, we have remarked group 4 (1.25 kg); this group was fed a combined feed with 15.20% crude protein, 0.82% lysine and 0.42% methionine. Simple correlations analysis and third degree polynomial regressions have led to the conclusion that there is a strong positive correlation between the obtained egg weight and the lysine or methionine intake. The highest correlation coefficient characterizes the experimental group 3 (0.882, p=0.004). The regression curves recorded for group 4 prove that the egg mass increases in the same time with ingestion up to the level of 19.83 g protein, 1069 mg lysine and 547 mg methionine, and then it does not react anymore concomitantly with the increase of the lysine or methionine ingestion