Abstract
This study assessed the supplemental value of Roxazyme® G2 in the utilization of cassava fibre meal (CFM) by broiler-chickens in a 56 day feeding trial. A batch of three hundred and sixty day-old Arbor acre broiler-chicks was allotted to twelve treatments replicated five times of six birds in a 4 × 3 factorial in complete randomization. Cassava fibre meal was substituted for maize at 0, 20, 40 and 60% levels and Roxazyme® G2 supplementation was at 0, 100 and 200 mgkg-1. Results showed that CFM substitution at 40 and 60% levels for maize led to significant decrease (p<0.05) in weight gain of broiler chickens at both starter and finisher stages while feed conversion ratio was significant (p<0.05) at 60% CFM substitution at the starter phase. The effect of enzyme supplementation was not significant in the physiological growth of the birds at both starter and finisher stages. Eviscerated weight, liver and kidney weights were significantly (p<0.05) affected by CFM substitution. The effect of interaction was not significant (p>0.05) indicating that performance, carcass and organ description of broiler chickens were not dependent of the two factors under investigation. At starter phase, CFM substitution led to the saving of $0.07-0.08 per cost of feed $/kg weight gain and $0.08-0.13 per cost of feed $/kg weight gain on broiler finisher production. Roxazyme® G2 supplementation only at 100 mgkg-1 led to the saving of $0.03 and 0.01 per cost of feed $/kg weight gain at the starter and finisher stages respectively. Key words: Broiler chickens, cassava fibre meal, Roxazyme® G2, weight gain.
Highlights
The increased cost of maize occasioned by the stiff competition for its use by man, animal and industry has been the bane to its economic incorporation as a major energy source in poultry diets, especially broiler chicken diets
The proximate composition (g100 g-1) of cassava fibre meal (Table 1) used in this study shows a crude protein (CP) content of 3.95, crude fibre (CF) 20.02, crude fat 3.35 and ash 4.31
Results on the phytochemical components of the experimental diets (Table 3) show that oxalate, phytate-P, phytate and cyanide concentrations were significantly higher (P
Summary
The increased cost of maize occasioned by the stiff competition for its use by man, animal and industry has been the bane to its economic incorporation as a major energy source in poultry diets, especially broiler chicken diets. This has hitherto led to increase in the cost of finished feeds with resultant increase in the cost of intensive poultry production with consequent increase in the cost of animal protein supply viś-á-viś low animal protein intake, among the resource poor citizens in developing countries (Agbede, 2019). The use of fibre degrading technology such as fermentation (Aro et al, 2012, Oloruntola et al, 2016a; Adeyeye et al, 2019) and exogenous enzyme supplementation (Fasiullah et al, 2010; Oladunjoye and Ojebiyi, 2010; Ogunsipe et al, 2015; Ogunsipe, 2017; Oloruntola et al, 2018b) has been reported to enhance the utilization of fibre rich diets
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