Prediction equations to estimate the demand of energy and crude protein for maintenance, gain and egg production for laying Japanese quails

Abstract

-The study was conducted to estimate requirements of energy and crude protein for maintenance, weight gain and egg production of Japanese quails in the period of 67 to 107 days of age. Two experiments were performed: one, to determine the requirements for maintenance of protein, and the other, for energy. Experiments were conducted in a completely randomized design with four dietary levels of offer and four replicates of six birds. The diets offered were: ad libitum (100%), 75%, 50%, and 25% consumption ad libitum (below maintenance). The methodology used to estimate the demand for maintenance was the comparative slaughter. For estimation of the requirement for weight gain, eight groups of 15 quails were reared separately, fed ad libitum and housed under 22 ºC controlled temperature. From these poultry, three groups were slaughtered at 5, 10, 15, 20, 25, 30, 35 and 40 days of the trial. The requirement for egg production was obtained by taking the ratio of energy content, egg protein, efficiency of energy use and protein for egg production. Prediction equations that estimate maintenance requirement, weight gain and egg production in energy and crude protein of Japanese quail include: metabolizable energy (kcal/bird/day) = 92.34*body weight 0.75 + 6.23*weight gain + 4.19*egg mass; crude protein (g/bird/day) = 6.71*body weight 0.75 + 0.615*weight gain + 0.258*egg mass.

Amino Acid for Japanese Quails: Methodologies and Nutritional Requirement

“…However, the values are consistent when analyzing animals in the same category [27,31] which were: 1.94 and 2.28 × body weight 0.75 . It can be observed that the net requirement of CP (g/bird/day) for gain, determined by the two techniques (CS and NB) and reported in the works of [18,[25][26][27][28][29][30][31] The values of requirement of CP (g/bird/day) estimated for egg mass production in laying hens and Japanese quails were, respectively, 0.301 × egg mass [26], and 0.258 × egg mass [18]. However, the irst one presents a lower requirement of amino acids and CP, evidencing that the greater requirement of quails is related to the higher maturity rate, that is, higher precocity [9][10][11].…”

“…There studying the requirements of CP for maintenance and gain with Japanese quails in production using the CS technique, [18] It is known that nutritional needs are changed according to species, animal category, room temperature, diet composition and animal density. However, another important factor that changes the nutritional needs is the methodologies used [18,[25][26][27][28][29][30][31], such as the CS and NB techniques used in the elaboration of prediction equations.…”

“…However, another important factor that changes the nutritional needs is the methodologies used [18,[25][26][27][28][29][30][31], such as the CS and NB techniques used in the elaboration of prediction equations.…”

“…However, the irst one presents a lower requirement of amino acids and CP, evidencing that the greater requirement of quails is related to the higher maturity rate, that is, higher precocity [9][10][11]. Corroborating the indings of [18,[25][26][27]29], where these authors found a requirement of CP for greater maintenance and gain for Japanese quails in relation to laying hens and heavy matrices.…”

“…However, the relative weight of quail eggs is higher, and may reach 10% of body weight. The weight of eggs of quails has a mean value of 12 g [17][18][19][20] and eggs of laying hens around 65 g [21][22][23][24].…”