Simulated amino acid requirements of growing pigs differ between current factorial methods

Autor(es)

Remus, A. ^{[1, 2]} ; Hauschild, L. ^[2] ; Pomar, C. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Agr & Agri Food Canada, Sherbrooke Res & Dev Ctr, Sherbrooke, PQ J1M 0C8 - Canada

^[2] Sao Paulo State Univ, Sch Agr & Vet Studies, Dept Anim Sci, UNESP, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANIMAL; v. 14, n. 4, p. 725-730, APR 2020.
• Citações Web of Science: 0

Resumo

Significant differences in the estimation of amino acid requirements exist between the available factorial methods. This study aimed to compare current factorial models used to estimate the individual and population standardised ileal digestible (SID) lysine (Lys) requirements of growing pigs during a 26-day feeding phase. Individual daily feed intake and BW data from 40 high-performance pigs (25-kg initial BW) were smoothed by linear regression. Body weight gain was constant (regression slope not different from 0) for all the pigs. The CV of the SID Lys requirements ranged from 22% at the beginning of the trial to 8% at the end. The population Brazilian tables (BT-2017) and National Research Council (NRC-2012) SID Lys requirements for the average pig were 16% higher than the average requirement estimated by the individual precision-feeding model (IPF), but similar to the estimated for the population assuming that population requirements are those of the 80th-percentile pig of the population (IPF-80). Meaning that, the IPF-80, BT-2017, and NRC-2012 models would yield similar recommendations when pigs are group-fed in conventional multi-phase systems. Additionally, the IPF-80 estimates are independent of the phase length, whereas the BT-2017 and NRC-2012 models use average population values in the middle of the feeding phase for the calculations and therefore, conventional requirement estimations decrease as the length of the feeding phase increases. In conclusion, the BT-2017 and NRC-2012 methods were calibrated for maximum population responses, which explains why these methods yield higher values than those estimated for the average pig by the IPF model. This study shows the limitations of conventional factorial methods to estimate amino acid requirements for precision-feeding systems. (AU)

• Processo FAPESP: 13/01309-5 - Sistemas integrados de nutrição de precisão para suínos: desenvolvimento de um novo método para estimar exigências em metionina
• Beneficiário: Aline Remus
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 12/03781-0 - Sistemas integrados de nutrição de precisão (SINP) para suínos e aves em crescimento: estimando exigências nutricionais individuais em tempo real (suínos) e avaliação do SINP (suínos e aves)
• Beneficiário: Luciano Hauschild
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 13/26852-3 - Sistemas Integrados de nutrição de precisão para suínos: desenvolvimento de um novo método para estimar exigências em metionina
• Beneficiário: Aline Remus
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado