Efeito de diferentes densidades de alojamento sobre os parâmetros produtivos e sanguíneos de codornas japonesas em postura

Abstract

An experiment was conducted in the Poultry Sector of the School of Veterinary Medicine and Zootechnics of the Federal University of Tocantins, this work aims to characterize different densities of housing on the characteristics of the zootechnical performance of Japanese quails in laying, the quality of the egg shell and the hematological profile of these animals through physiological indicators. Upon reaching the peak of laying, the quails were weighed and distributed by weight and laying in the experimental units according to the completely randomized design, with four treatments and five repetitions per treatment. The treatments are the four different densities of accommodation: T1: 112.2 cm² / bird (10 birds per cage); T2: 102 cm² / bird (11 birds per cage); T3: 93.5 cm² / bird (12 birds per cage) and T4: 86.31 cm² / bird (13 birds per cage), totaling 230 birds. The birds were evaluated during the laying period. There were 125 experimental days divided into five periods of 25 days, analyzed in a factorial scheme (Time x Density). After the batch registers 5% of production total white percentage of erythrocytes (Hct,%), hemoglobin (g / dL), total white cell count (CTL, µL); heterophil / lymphocyte ratio (H / L); hematimetric indices: mean corpuscular volume (MCV, µm3), mean corpuscular hemoglobin (HCM, pg / cell) and concentration of mean corpuscular hemoglobin (CHCM, g / dL); egg shell quality: shell thickness (ST), specific gravity (SG), shell weight (SW); and the productive performance of birds: feed consumption (FC), laying rate (RL), egg weight (WE), egg mass (ME), conversion per dozen (CDz) and egg mass (CMO). The variables (CR, g / bird / donate), (CMO, g), and (CDz, g), (MO, g), (TP,%) there was no effect between the different treatments (p˃0.05) , as well as the eggshell quality variables (p˃0.05) there was also no effect between the different treatments, the variable (PO, g) there was an effect (p = 0.023). The heterophile / lymphocyte relationship had a significant effect (p = 0.01), so it can be affected as time and density of accommodation are increased. The mean corpuscular volume effect (p = 0.0001) was influenced by time. Just as the total leukocyte count (p = 0.001) also increased until the third collection period as the accommodation period progressed, however in the last accommodation period there was a decay. The densities do not interfere with the performance and quality of the eggshell. The H / L ratio can be affected as time and housing density are increased. The mean corpuscular volume was influenced by time. Just as the total leukocyte count also increased as the accommodation period progressed. The best treatment was 102 cm² / bird because it did not differ from the control treatment. It is recommended to house Japanese quail laying at densities of 86.31cm² / bird when it comes to performance.