Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens

Abstract

Non-ruminantsFull-length research article Multivariate modeling strategies to predict nutritional requirements of essential amino acids in semiheavy second-cycle hens ABSTRACT -An experiment with 23 diets was performed to evaluate the effect of digestible lysine (Lys), digestible methionine + cysteine (Met+Cys), and digestible threonine (Thr) on egg production of H&N Brown second-cycle laying hens (SCLH) for 20 weeks (92-111 weeks of age) in cages under environmental conditions. Body weight (BW), feed intake (FI), feed conversion ratio (FCR), egg weight (EW), number of hen-housed eggs, and livability were also evaluated during the experiment. Diets were formulated from a central composite design that combined five levels of Lys, Met+Cys, and Thr ranging from 727 to 1159, 662 to 1055, and 552 to 882 mg/kg, respectively. Egg production (EP) data were evaluated through three different modeling strategies: egg production models, multivariate polynomial models, and artificial neural networks (ANN). A cascade-forward neural network with logsigmoid transfer function was selected as the best model according to goodness-offit statistics in both identification and validation data. One of the best scenarios for EP of H&N Brown SCLH under specific outdoor conditions was established at Lys, Met+Cys, and Thr levels of 1138, 1031, and 717 mg/hen• day, respectively. The ANN model may be an appropriate tool to study and predict EP of H&N Brown SCLH based on the combination of three different levels of essential digestible amino acids. The strategies included in this work may contribute to improving poultry performance based on modeling techniques to study other production parameters in terms of different nutritional requirements and productive conditions.

Multivariate analysis of sources of polyunsaturated fatty acids, selenium, and chromium on the productive performance of second-cycle laying hens

“…The average feed intake of all treatments was 109.8±8.3 g/hen over 16 weeks of production. Feed intake was similar among the diets, between 106.8±7.0 and 110.0±7.8 g/hen, lower than those reported by Morales-Suárez et al (2021) for H&N Brown SCLH during 20 weeks of production, which registered 114.3 and 116.7 g/hen•day. According to the average feed intake, iOM, iSe, and iCr levels in diets (Table 3) range up to 3.300±0.363, 0.132±0.015, and 0.176±0.019 g/hen•day, respectively.…”

“…The fieldwork was conducted under environmental production conditions in San Pedro, Antioquia, Colombia (6°27'34" N latitude, 75°33'28" W longitude, and 2475 m asl), with an annual average temperature of 14 °C and relative humidity of 79%. A total of 1380 91-week-old Isa Brown SCLH were housed for 16 weeks (106 weeks old) in a caged-layer house of commercial design (Californian-type cages) under the molting and resting conditions reported by Morales-Suárez et al (2021).…”

“…In each EP model (Eqs. 1-4), parameters a, b, c, and d were written in terms of iOM, iSe, and iCr according to the procedure described by Morales-Suárez et al (2021).…”

“…12) equations were used as transfer functions. Between five and eleven neurons in one hidden layer for each network architecture and transfer function combination were assessed (Morales-Suárez et al, 2021).…”

“…Non-linear multivariate models can be used to evaluate the effect of multiple nutrients in the diet (Morales-Suárez et al, 2021). In this work, multivariate modeling, optimization, and sensitivity analysis were applied to study the effect of PUFA and organic minerals supplementation on EP and FCR of Isa Brown second-cycle laying hens (SCLH) during a productive cycle of 91 to 106 weeks of age.…”