reduced feed conversion ratio (-2,8pts, p=0.007, Figure 2). Final body weight was 63g higher compared to the birds receiving the control diet with no additive (respectively 2195g and 2258g on average), which translated into a significant higher average daily weight gain (ADG, Figure 3). Similar results were observed in a previous research, designed by
the University of Wageningen in the Netherlands to evaluate the effect of AVIMATRIX Z on broiler performance. The birds were divided into 2 groups with 10 pens and 20 birds per pen. After 42 days, animals receiving the slow release formulation were 73 g heavier and feed conversion was significantly reduced by 3 points (p= 0.005, Figure 4). This finally resulted in a 2,16% higher total production efficiency, as measured by calculating the European Production Efficiency factor (378 for AVIMATRIX Z fed birds compared to 370 for the non-supplemented birds).
The benefit of protecting the benzoic acid with a sophisticated
Figure 4: Improvement in feed efficiency seen when adding AVIMATRIX Z to a broiler diet for 42 days
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2464 2545
2747
1.82 1.84
Avg weight gain (g/bird)
manufacturing technology to support feed conversion of broilers compared to using a free benzoic source, was demonstrated in a 3rd study performed at the Roslin Nutrition Research Institute in Scotland. Birds receiving the diet containing AVIMATRIX Z had a significantly higher body weight at 42 days because of better daily weight gains, as well compared to non-benzoic acid supplemented broilers as to those fed free benzoic acid (similar final inclusion level of active ingredient, p<0.05, Figure 5). In line with the previous trials mentioned, the AVIMATRIX Z chickens also achieved a significant better FCR (p=0.0148, Figure 6). These findings suggest that the combination of a strong antimicrobial active ingredient in a formula ensuring a gradual release and targeted activity at the key intestinal sites, provides the most optimal impact on broiler performance. The above benefits are consistent with experiences gained
in several commercial farms across Europe; improvement in feed conversion, higher daily gains, healthier birds and improvement in foot pad health. A large-scale trial was realized on a broiler production
1.72 1.74 1.76 1.78 1.8
1.7 FCR (Day 1-42)
facility in Northern EU involving 16 identical houses, each with approx. 14.000 Ross 308 birds. Eight broiler houses were kept as control group (birds fed a basal, 4 phase diet) and 8 houses as the treatment group (birds receiving the standard feed supplemented with 500g AVIMATRIX Z/t during 35 days). To exclude any house effect, a switchback concept was implemented: the trial was repeated a 2nd time in which groups were switched. Due to having older birds in the control group, the FCR achieved were adjusted to the same final
1. Yousaf et al. 2016, Encapsulated benzoic acid supplementation in broiler diets influences gut bacterial composition and activity, British Poultry Science, Peris et al., Growth promoting properties of a blend of protected aromatic compounds in growing broilers, ESPN 2017, Barea et al. A blend of protected aromatic compounds on growth and intestinal C. perfringens and E. coli populations of broilers, ESPN 2017
FEED COMPOUNDER SEPTEMBER/OCTOBER 2018 PAGE 63 1,818 1,784 1,761
Figure 5: Adding AVIMATRIX Z to a broiler diet for 42 days significantly raised the daily weight gain of broilers
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1.8 1.8
Avg weight gain (g/bird)
Figure 6: Higher impact of a protected source of benzoic acid on improving feed efficiency in broilers aged 42 days, compared to chickens receiving a free source of benzoic acid or not
1.7 1.7 1.7 1.7 1.
1.
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