Effect of cassava grits as maize replacement on carcass characteristics of two strains of broiler chickens
Carcass characteristics are measures of relative proportions of meat and bone, among others, of an animal’s carcass and dictate the acceptability by processors and consumers. Carcass characteristics of two strains of broiler chickens fed diets containing varying levels of cassava grits (CG) were determined using 120 (four-week-old) broiler chickens for each of Arbor Acre Plus (AAP) and Marshall (MS) Strains. The birds were randomly distributed into four dietary treatments of CG as replacement for maize (0, 20, 40, and 60 per cent) at finisher phase. Each treatment had three replicates. At the end of the feeding trial which lasted 28 days, four birds with weights close to the group average were selected per replicate, fasted for 24 hours, weighed, and sacrificed for carcass analysis. Data were collected on carcass characteristics and cut parts and analysed using ANOVA. Results showed that strain had no significant (p > 0.05) influence on carcass characteristics and cut parts parameters except (p < 0.05) relative plucked weight. Broilers fed 0 per cent CG inclusion recorded highest (p < 0.05) live weight (2103.75 g). CG levels had no significant (p > 0.05) influence on dressed weight and choice cuts (breast, thigh, and drumstick) of chickens. The study concluded that CG could be used to replace up to 60 per cent of maize in finishing diets for broiler chickens without negative effects on dressed weight and choice cuts.
Performance and economic benefits of meat-type chicken fed diets containing white and yellow cassava supplemented with different additives
Two hundred and forty unsexed day-old broiler chickens were allotted to eight dietary treatments arranged in a 4 × 2 factorial arrangement of two cassava varieties (white and yellow cassava) supplemented with no additive (control), synthetic amino acid, cellulase enzyme and a combination of amino acid and cellulase enzyme for the starter (0–4 weeks) and finisher (4–8 weeks) phases. Data was collected on growth performance, feed conversion ratio (FCR), cost of feed consumed per kilogram and analysed using ANOVA. Starting broilers fed a diet containing yellow cassava supplemented with amino acids had the most superior (p < 0.05) final weight (709.09 g/bird), weight gain (657.27 g/bird), best FCR (1.93), and the cheapest (p < 0.05) cost per kilogram weight gain (₦200.15/kg [US$0.56]). Finishing broilers fed a diet containing white cassava supplemented with amino acid also recorded the best (p < 0.05) FCR (2.43) and cheapest cost of feed consumed per kilogram weight gain (₦226.71/kg [$0.63]). The study concluded that dietary supplementation with amino acid when white or yellow cassava root is to be used in the nutrition of broilers is essential for improved growth performance and economic benefits to broiler farmers.