High levels of standardized ileal digestible amino acids improve feed efficiency in slow-growing pigs at late grower-finisher stage
Camp Montoro, Jordi (Universitat Autònoma de Barcelona. Servei de Nutrició i Benestar Animal)
Solà Oriol, David (Universitat Autònoma de Barcelona. Servei de Nutrició i Benestar Animal)
Muns, Ramon (Agri-Food and Biosciences Institute)
Gasa, Josep (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Llanes, Núria (Cooperativa d'Ivars d'Urgell SCCL)
Manzanilla, E. G. (University College Dublin. UCD Veterinary Sciences Centre)

Fecha:	2022
Resumen:	Slow-growing pigs negatively affect production efficiency in conventional pig farms by increasing the occupation time of the facilities and being a limiting factor for the All-In/All-Out swine production systems. This subset of pigs is usually managed with the rest of the pigs, and their nutrient requirements may not be fulfilled. The purpose of the present study was to compare the productive performance of slow- and fast-growing pigs to different standardized ileal digestible (SID) amino acids (AA) dietary levels at late grower-finisher stage. A total of 84 pigs were weighed, tagged, and classified as slow-growing (SG; n = 48; 24. 1 ± 1. 38 kg) or fast-growing pigs (FG; n = 36; 42. 7 ± 1. 63 kg) at 11 weeks of age. Pigs were housed in mixed sex pens (n = 8 SG+6 FG/pen) equipped with feeding stations to record daily feed intake per individual pig. Pigs were assigned to three dietary treatments resulting in a 2 × 3 factorial arrangement at 15 weeks of age. Isoenergetic diets were formulated by increasing the ideal protein profile based on the following SID lysine (Lys) levels: 0. 92%, 1. 18% and 1. 45%. Pigs were weighed bi-weekly until 21 weeks of age. Fast-growing pigs were 33. 7 kg heavier, gained 255 g/day and consumed 625. 5 g/day more than SG pigs (p < 0. 001). No interaction or diet effects were observed for final body weight, average daily gain and average daily feed intake (p > 0. 05). However, feed conversion ratio was 0. 3 lower for SG pigs fed 1. 45% SID Lys/AA compared to SG pigs fed 0. 92% SID Lys/AA (p = 0. 002). Feed conversion ratio was not different within the FG pigs' dietary treatments (p > 0. 05). The efficiency of SG pigs may be improved when dietary SID AA levels are increased from 0. 92 up to 1. 45% SID Lys/AA. Thus, nutrient requirements may vary depending on growth rate at the same age, and SG pigs may require higher dietary SID AA levels than FG pigs to achieve similar productive performance.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Journal of Animal Physiology and Animal Nutrition, Vol. 106 Núm. 2 (march 2022) , p. 276-283, ISSN 1439-0396

DOI: 10.1111/jpn.13610
PMID: 34288144

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