Mathematical models to predict the energy requirements of Japanese quails from 01-35 days age

Abstract

The objective of the work was to estimate maintenance and energy gain requirements in the phases: 01 to 15 and 15 to 35 days of age. For maintenance energy, 240 quails (per phase) were used according to a completely randomized design, with four treatments (ad libitum, 75%, 50% and 25%), six replicates, and ten quails per experimental unit (n = 655). Comparative slaughter group (35-initial phase; 25-growth phase). To estimate energy for gain, groups of 15 quails were slaughtered at 3, 6, 9, 12 and 15 days of age, in the initial phase, and groups of 10 quails at 20, 25, 30 and 35 days of age, in the growth phase. All slaughter was performed after a 12-hour fast. The equation of energy retained as a function of consumption made it possible to estimate an endogenous energy loss around 9.30 and 19.59 kcal/kg0.67/day and maintenance requirements at 54.96 and 91.48 kcal/kg0.67/day, respectively for the initial and growth phases. The angular coefficient of the line obtained by the linear relationship between energy retained and carcass weight over time allowed estimating the net weight gain requirements around 1.40 and 1.89 kcal/g, respectively, for the initial and growth. EMA1–15d = (54.96 × P0.67) + (8.30 × WG). EMA15-35d = (92.11 × P0.67) + (8.91 × WG). EMA - apparent metabolizable energy, (Kcal/quail /d); P, live weight (kg); WG, weight gain (g/quail/d).

Ajuste de curvas de crescimento em codornas de corte por inferência Bayesiana

“…As codornas, sejam destinadas à produção de carne ou ovos, apresentam maturidade sexual precoce a qual está relacionada com a taxa de crescimento, ou seja, codornas menores têm taxa de crescimento superior e menor idade até a maturidade sexual, sendo assim, a precocidade no crescimento está relacionada ao tempo que as codornas levam para tingir a maturidade sexual, sendo este parâmetro norteador na produção animal, além de demonstrar as diferentes necessidades nutricionais das codornas (Vieira et al, 2020).…”

Mathematical model for the prediction of available phosphorus and calcium requirements for European quails of 16-36 days old

“…There are several works that bring the requirements of laying quails in both methods (Silva et al, 2004a(Silva et al, , 2004bVieira et al, 2020a;2020b). However, for European quails, the data are scarce mainly in relation to the factorial method, and also, in mineral nutrition (Silva and Costa, 2009;Scherer et al, 2011;Vieira et al, 2012;Mariz et al, 2016;Perine et al, 2016).…”