Efeito da utilização de farelo de girassol na dieta sobre o desempenho de frangos de corte

Abstract

RESUMO -Foi realizado um experimento para avaliar os efeitos da inclusão de farelo de girassol em rações para frangos de corte sobre o desempenho, o rendimento de carcaça e dos cortes e a viabilidade econômica. O delineamento experimental foi em blocos casualizados com cinco níveis de farelo de girassol (0, 5, 10, 15 e 20% da dieta basal), oito repetições e 20 aves por unidade experimental. As aves e as rações foram pesadas no início e ao final de cada fase do período experimental(1 a 21 dias e 22 a 42 dias) para obtenção do consumo de ração, do ganho de peso e da conversão alimentar. Duas aves de cada repetição foram abatidas aos 42 dias de idade para avaliação da carcaça. Com a inclusão do farelo de girassol, o consumo diminuiu linearmente na fase inicial (y = 1185,1 -2,1x; R 2 = 0,97), enquanto a conversão alimentar melhorou de forma linear no período total (y = 1,6404 -0,0018x; R 2 = 0,62) e de forma quadrática na fase inicial (y = 1,3943 -0,0069x + 0,0002x 2 ; R 2 = 0,96). Não foi encontrada diferença significativa no rendimento de carcaça e dos cortes. Os melhores desempenhos econômicos foram obtidos quando as aves foram alimentadas com rações contendo 5% de farelo de girassol na fase inicial e 0% na fase de crescimento e no período total. A adição de 20% de farelo de girassol em rações para frangos de corte até os 42 dias de idade não prejudica o desempenho produtivo das aves. Palavras-chave: alimento alternativo, avicultura, carcaçaEffect of different levels of sunflower meal in diets on the performance of broiler chickens ABSTRACT -A trial was carried out to evaluate the effect of sunflower meal inclusion in the broiler diets on the performance, carcass yield and cuts and the economics viability. A randomized block experimental design was used, with five treatments and eight replications of 20 birds per experimental unit. Treatments consisted of including 0, 5, 10, 15, or 20% sunflower meal in a basal diet. Birds and diets were weighed at the beginning and at the end of each experimental phase (1 to 21 days and 22 to 42 days) to determine feed intake, weight gain, and the feed:gain ratio. Two birds per replication were slaughtered at 42 days of age for carcass evaluation. Feed intake was linearly reduced in the starter phase (y = 1185.1 -2.1x; R 2 = 0.97), with sunflower meal inclusion in the basal diet, and the feed:gain ratio linearly improved in the total period (y = 1.6404 -0.0018x; R 2 = 0.62), whereas a quadratic effect on the feed:gain ratio was observed in the starter phase (y = 1.3943 -0.0069x + 0.0002x 2 ; R 2 = 0.96). No significant differences were observed for carcass yield and cuts. The best economic performances were achieved when the birds were fed diets containing 5% sunflower meal in the starter phase, and 0% in the grower phase and total period. The inclusion of 20% sunflower meal in the diet of broilers up to 42 days of age did not show harmful effects on performance.Key Words: alternative feedstuffs, carcass, poultry production IntroduçãoNutricionistas têm buscado alternativas que t...

Sunflower meal and enzyme supplementation of the diet of 21- to 42-d-old broilers

“…At a same SFM inclusion level, feed formulation worsened feed conversion ratio in the following order: NC, NC+EB, and PC. These results do not agree with the findings of several authors (Furlan et al, 2001;Pinheiro et al, 2002;Abdelrahman & Saleh, 2007;Tavernari et al, 2009). The best production efficiency index (PEI) was obtained in broilers fed the PC diet with not inclusion of sunflower meal (Table 6).…”

“…There was a linear effect (p<0.05, Table 4) of sunflower meal levels on feed intake, which increased only in the PC diets (Table 5), differently from the reports of Furlan et al (2001) and Tavernari et al (2009), who did not find any significant differences in that parameter up to the levels of 20 and 25% SFM inclusion, respectively. Abdelrahman & Saleh (2007) obtained higher feed intake with the inclusion of 10% sunflower meal.…”

“…However, those authors used the residue SFM cold-pressing , which is more nutritious (32.3% CP and 18.78% EE) than sunflower meal. Tavernari et al (2009) did not find weight gain differences in broilers fed up to 20.0% SFM.…”

“…Therefore, despite resulting in worse performance, the inclusion of 8.0% sunflower meal may be economically viable, as well as the addition of the enzyme blend to this feed. On the other hand, Furlan et al (2001) and Tavernari et al (2009) verified better EEI when sunflower meal was not included in the feeds, but Pinheiro et al (2002) reported that the inclusion of 4.0% SFM promoted the best EEI. α NC = negative control; NC+EB = negative control + enzyme blend; PC = positive control.…”

“…Tavernari et al (2009) also reported that broiler feed intake was inversely proportional to SFM dietary level.…”