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Effects of alternative feed additives to medicinal zinc oxide on productivity, diarrhoea incidence and gut development in weaned piglets

Published online by Cambridge University Press:  26 February 2020

G. D. Satessa ,
N. J. Kjeldsen ,
M. Mansouryar ,
H. H. Hansen ,
J. K. Bache  and
M. O. Nielsen
G. D. Satessa
Affiliation:
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Grønnegårdsvej 3, FrederiksbergC 1870, Denmark
N. J. Kjeldsen
Affiliation:
Livestock Innovation, SEGES, Axeltorv 3, CopenhagenV 1609, Denmark
M. Mansouryar
Affiliation:
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Grønnegårdsvej 3, FrederiksbergC 1870, Denmark
H. H. Hansen
Affiliation:
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Grønnegårdsvej 3, FrederiksbergC 1870, Denmark
J. K. Bache
Affiliation:
Livestock Innovation, SEGES, Axeltorv 3, CopenhagenV 1609, Denmark
M. O. Nielsen*
Affiliation:
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Grønnegårdsvej 3, FrederiksbergC 1870, Denmark Department of Animal Science, Faculty of Technology, Aarhus University, Blichers Allé 20, Tjele8830, Denmark
*
†E-mail: mon@anis.au.dk
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Abstract

The use of medicinal zinc oxide (ZnO) must be phased out by 2022, thus prompting an urgent need for alternative strategies to prevent diarrhoea in weaner piglets. The objectives of this study were to assess the impact on weaner piglet performance, diarrhoea incidence and gut development, when (1) dietary ZnO supplementation was substituted by alternative commercial products based on macroalgae, specific probiotics or synbiotics, or (2) dietary ZnO inclusion was reduced from 2500 to 1500 ppm. A total of 4680 DLY piglets (DanBred, Herlev, Denmark), weaned around 35 days of age, were randomly assigned according to sex and BW to six different dietary treatment groups. A basal diet was supplemented with no ZnO (NC = negative control), 2500 ppm ZnO (PC = positive control), 1500 ppm ZnO (RDZ = reduced dose of ZnO) or commercial macroalgae (OceanFeed™ Swine = OFS), probiotic Miya-Gold or synbiotic GærPlus products. The piglets entered and exited the weaner unit at ~7.0 and 30 kg BW, respectively. In-feed ZnO was provided the first 10 days post-weaning, while the alternative supplements were fed throughout the weaner period. As expected, the average daily feed intake, average daily weight gain (ADG), feed conversion ratio (FCR) and diarrhoea incidence were improved in the PC compared to NC group (P < 0.05) during phase 1 consistent with improved indices of villi development observed in subgroups of piglets sacrificed 11 days post-weaning. Reduction of ZnO to 1500 ppm lowered ADG (P < 0.05) and slightly increased incidence of diarrhoea during the first 10 days after weaning (but not later) without affecting FCR. None of the three alternative dietary additives, including a 10-fold increased dose of GærPlus than recommended, improved piglet performance, gut health and gut development above that of NC piglets. The OFS piglets sacrificed 11 days after weaning had significantly lower weights of hindgut tissue and contents compared to the PC group, consistent with antimicrobial activity of the product, which was detected from anaerobic in vitro fermentation. In conclusion, dietary ZnO supplementation during the first 10 days post-weaning may be reduced from 2500 to 1500 ppm without major negative implications for weaner piglet performance and health in herds under a high management level. However, none of the alternative dietary supplements were able to improve piglet performance or gut health, when ZnO was omitted from the diet.

Keywords

probioticmacroalgaeyeastvilli developmenthindgut development
Type
Research Article
Information
animal , Volume 14 , Issue 8 , August 2020 , pp. 1638 - 1646
Copyright
© The Animal Consortium 2020

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