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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Feeding behavior of growing and finishing pigs fed different dietary threonine levels in a group-phase feeding and individual precision feeding system

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Remus, Aline [1, 2, 3] ; Hauschild, Luciano [2] ; Letourneau-Montminy, Marie-Pierre [3] ; Andretta, Ines [4] ; Pomar, Candido [1, 3]
Total Authors: 5
[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, BR-14883108 Sao Paulo, SP - Brazil
[3] Univ Laval, Dept Anim Sci, Quebec City, PQ G1V 0A6 - Canada
[4] Univ Fed Rio Grande do Sul, Sch Agron, Dept Anim Sci, BR-91540000 Porto Alegre, RS - Brazil
Total Affiliations: 4
Document type: Journal article
Web of Science Citations: 0

Feeding behavior is an important aspect of pig husbandry as it can affect protein deposition (PD) in pigs. A decrease in plasma threonine (Thr) levels may influence feed intake (FI) due to amino acid imbalance. We set out to study whether different Thr inclusion rates of 70%, 85%, 100%, 115%, and 130% of the ideal Thr:lysine (Lys) ratio of 0.65 in two different feeding programs (individual precision feeding and group-phase feeding could affect pig feeding behavior and consequently PD. Two 21-d trials were performed in a 2 x 5 factorial setup (feeding systems x Thr levels) with 110 pigs in the growing phase {[}25.0 +/- 0.8 kg of body weight (BW)] and 110 pigs in the finishing phase (110.0 +/- 7.0 kg BW), which correspond to 11 pigs per treatment in each trial. Pigs were housed in the same room and fed using computerized feeding stations. The total lean content was estimated by dual x-ray absorptiometry at the beginning (day 1) and the end (day 21) of the trial. Multivariate exploratory factor analysis was performed to identify related variables. Confirmatory analysis was performed by orthogonal contrasts and Pearson correlation analysis. Graphical analysis showed no difference in feeding patterns between feeding systems during the growing or finishing phase. Pigs exhibited a predominant diurnal feeding, with most meals (73% on average) consumed between 0600 and 1800 h. Exploratory factor analysis indicated that feeding behavior was not related to growth performance or PD in growing or finishing pigs. Changes in feeding behavior were observed during the growing phase, where increasing dietary Thr resulted in a linear increase in the FI rate (P < 0.05). During the finishing phase, the duration of the meal and FI rate increased linearly as dietary Thr increased in the diet (P < 0.05). These changes in feeding behavior are, however, correlated to BW. In conclusion, the exploratory factor analysis indicated that feeding behavior had no correlation with growth performance or protein and lipid deposition in growing or finishing pigs. Dietary Thr levels and feeding systems had no direct effect on FI. (AU)

FAPESP's process: 14/25075-6 - Ideal amino acids profile to individual x population: verifying sulfur amino acids ratio to lysine for growing pigs
Grantee:Aline Remus
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 18/15559-7 - Precision nutrition for sanitary challenged pigs reared in hot climate areas
Grantee:Luciano Hauschild
Support type: Research Grants - Young Investigators Grants - Phase 2