Electrolyte balance in diets with reduced protein for semi-weighted laying hens in the second production cycle

Abstract

-The objective was to evaluate the effect of electrolyte balance in diets with reduced protein for semiweighted Bovans Goldline laying hens in the second production cycle. The design was completely randomized with five treatments and seven replicates of six birds per experimental unit. Treatment 1 consisted of a control diet containing 165.0 g/kg crude protein (CP), formulated with the addition of DL-methionine to meet birds requirements during the experimental period. To compose the treatments 2-5 (BE149, BE167, BE185 and BE203), a basal diet with reduced protein (135.0 g/kg CP) supplemented with synthetic amino acids DL-methionine, L-lysine, L-threonine, L-valine and L-tryptophan was formulated. This basal diet was supplemented with potassium carbonate, to replace the inert, so as to provide four levels of potassium (5.86, 6.56, 7.26 and 7.96 g/kg) corresponding to the electrolyte balance of 171, 149, 167, 185 and 203 meq/kg, respectively. There was increased linear effect for feed intake and decreasing linear effect for albumen weight and yolk percentage and quadratic effect for conversion per dozen and per egg mass. Crude protein is recommended at 135.0g/kg with 6.77 g/kg potassium and electrolyte balance of 172.51meq/kg in the diet of semi-weighted laying hens in the second production cycle.

Thermal comfort index, physiological variables and performance of quails fed with protein reduction

“…Feeding affects quail-farming costs from its base, the animal breeding industry, until the top of the production chain, i.e., slaughterhouses and freezers . However, the manipulation of the dietary electrolyte balance has been proposed as a means of improving the performance of poultry fed with low-crude protein diets (Oliveira et al, 2012).…”

Uso de sódio e potássio em diferentes níveis de proteína bruta para codornas em postura

“…The average maximum temperature observed was 27,6 ± 3,6° C and the minimum of 19,4 ± 4,9° C and relative humidity of 81,0 ± 9,0. In adulthood, the thermal comfort of the quail is between 18 and 22° C and relative humidity of 65 to 70 (Oliveira, 2007). In this way, the values found can be observed that the quails were subjected to heat stress during the experiment.…”

“…Changes in dietary electrolyte balance are performed in order to improve the performance of the birds, where the reduction in crude protein level in the diet is adopted (Oliveira et al, 2012). Several fatorem can interfere with the electrolyte balance (BE), among them, the room temperature and diet composition (Oliveira et al, 2010).…”

“…The electrolytes sodium, chloride and potassium participate in physiological processes such as the maintenance of osmotic pressure, synthesis of tissue proteins, the intracellular and extracellular maintaining homeostasis, maintaining the electrical potential of the cell membrane homeostasis acid base, and the operation the enzyme and the nerves (Oliveira et al, 2012).…”

Balanço eletrolítico total (BET) para codornas japonesas (Coturnix coturnix japonica)

“…Tendo em vista que os eletrólitos presentes nas dietas dos animais são capazes de influenciar os parâmetros de desempenho, carcaça, qualidade do ovo e da carne, a manipulação destes tem sido proposta como uma forma de melhorar o desempenho das aves (OLIVEIRA et al 2012). Porém as dietas são repletas de ingredientes capazes de influenciar no balanço eletrolítico e estes não são contabilizados no modelo proposto por Mongin (1981, p. 285-294), como por exemplo, os aminoácidos sintéticos.…”