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Table 1. Current and proposed maximum in feed Zn levels for pigs showing zinc intake from wean to finish. Feeding Program


Current Zinc Program (Jan 2017) CVMP Proposal


Medicinal and Feed Zinc reduction2 0-14 d


2500 150


1500 14 d to 30 kg


150 150 120


30 kg to Slaughter


120 120 100


Total Zinc Intake per pig (g)1


40.3 31 31


% reduction from current program


23 23


Notes 1: Calculated from an assumed intake of 4 kg/pig from wean (day 0 ) to day 14; 26 kg from day 14 to 30 kg and 220 kg from 30 kg to slaughter at 115 kg body weight. 2: In the presence of superdosing phytase from wean to 14 days and a minimum 500 FTU/kg phytase until slaughter


an increased level of disease challenge. Hence, any increase in diarrhea, morbidity or mortality associated with the removal of zinc oxide would reduce growth and feed efficiency thereby increasing the amount of zinc intake from wean to finish and per kg pork produced. This would have a negative economic impact on pig production as well as resulting in the unintended consequence of increased reliance of antibiotics to control post-weaning diarrhea. We should not ignore challenges to pig welfare from decreased ZnO usage. By not taking into account this potential higher zinc intake,


associated with a higher disease challenge, the targeted expected zinc reduction of around 23% less per finished pig may well not be met and so an alternative solution could be to potentially use zinc oxide at levels that help maintain pig welfare while still targeting lower levels of zinc intake.


Reducing zinc usage through an alternative proposal During the last 15 years since the withdrawal and subsequent reinstatement of ZnO in most EU countries there has been pressure on the medicinal use of ZnO in pig production post-weaning. Heightened concerns that ZnO may be banned led AB Vista and Primary Diets to work together to look at technical opportunities to voluntarily reduce the need for high medicinal ZnO use in piglet starter feeds. This led to the discovery that zinc utilization could be improved by phytate destruction through superdosing levels of phytase, allowing for lower medicinal ZnO levels. This partnership between producer, veterinarian and starter feed supplier has led to a fall in ZnO usage from an average of 2.93 kg/t in Sep-Dec 2013 to 2.54 kg/t in Sep-Dec 2016, equating to a -14% reduction, whilst maintaining full efficacy.


 


           


                 


The video is available to view by scanning this QR code or at www.abvista.com


Dr. Pete Wilcock Global Technical Manager, AB Vista





FEED COMPOUNDER MARCH/APRIL 2017 PAGE 43


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