Crescimento e desempenho de linhagens de aves pescoço pelado criadas em sistema semi-confinado
Data
2009-06-01
Autores
Dourado, Leilane Rocha Barros
Sakomura, Nilva Kazue [UNESP]
Nascimento, Dáphinne Cardoso Nagib do [UNESP]
Dorigam, Juliano César [UNESP]
Marcato, Simara Márcia
Fernandes, João Batista Kochenborger [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Editora da Universidade Federal de Lavras (UFLA)
Resumo
Este trabalho foi realizado para avaliar o crescimento e desempenho de duas linhagens de aves pescoço pelado. Foram utilizadas 400 aves, distribuídas em um delineamento inteiramente casualizado, os tratamentos consistiram de um esquema fatorial 2 x 2 (linhagens x sexo), com cinco repetições de 20 aves cada. Foram utilizadas aves Pescoço Pelado das linhagens Sasso e ISA Label. As aves receberam rações formuladas à base de milho e de farelo de soja para atender às exigências nutricionais. Foi determinado o ganho de peso (GP), o consumo de ração (CR) e a conversão alimentar (CA) aos 28, 56 e 84 dias de idade e o rendimento de carcaça e de partes aos 84 dias de idade. Não foi observada interação entre sexo e linhagem (P>0,05) para nenhuma das variáveis de desempenho analisadas. Para CR e GP houve diferenças significativas (P<0,05) entre as linhagens e entre os sexos nos três períodos. As aves da linhagem Sasso apresentaram desempenho superior à ISA Label. em relação aos parâmetros descritos da equação de Gompertz, as aves da linhagem Sasso apresentaram maior peso à maturidade (Pm) e tempo em que a taxa de crescimento é máxima (t*) e menor taxa de maturidade (b), indicando que as aves da linhagem ISA Label foram mais precoces para atingir a idade de máximo crescimento. As fêmeas demonstraram melhor aptidão para rendimento de peito e os machos para o rendimento de coxa e de sobra-coxa.
A trial was carried out to evaluate the growth and performance of naked neck birds. Four hundred birds were distributed into four treatments in factorial arrangement (2 strains x 2 genders), with five replicates of 20 birds each. The naked neck strains evaluated were Sasso and ISA Label. The birds were fed a diet formulated with corn and soybean meal according to the nutritional requirements. Food intake, body weight gain and food conversion were determined at 28, 56, and 84 days as well as the yield of carcass and cuts at 84 days. No interaction was observed between gender and strain (P>0.05). Food intake and body weight gain were different (P <0.05) between the strains and between the genders. Sasso strain presented higher performance than ISA Label. The parameters estimated for Gompertz equation, the weigh at maturity (Wm) and time that the growth rate is maximum (t*) were higher and maturity rate (b) was lower for Sasso strain than those of Isa Label strain. These results indicated that the Isa Label was more precocious than Sasso strain. The females showed better breast yield while the males showed better thigh and drumstick yield.
A trial was carried out to evaluate the growth and performance of naked neck birds. Four hundred birds were distributed into four treatments in factorial arrangement (2 strains x 2 genders), with five replicates of 20 birds each. The naked neck strains evaluated were Sasso and ISA Label. The birds were fed a diet formulated with corn and soybean meal according to the nutritional requirements. Food intake, body weight gain and food conversion were determined at 28, 56, and 84 days as well as the yield of carcass and cuts at 84 days. No interaction was observed between gender and strain (P>0.05). Food intake and body weight gain were different (P <0.05) between the strains and between the genders. Sasso strain presented higher performance than ISA Label. The parameters estimated for Gompertz equation, the weigh at maturity (Wm) and time that the growth rate is maximum (t*) were higher and maturity rate (b) was lower for Sasso strain than those of Isa Label strain. These results indicated that the Isa Label was more precocious than Sasso strain. The females showed better breast yield while the males showed better thigh and drumstick yield.
Descrição
Palavras-chave
free-range system, Growth curve, organic birds, slow-growth broilers, Aves caipira, aves de crescimento lento, Curva de crescimento, criação alternativa
Como citar
Ciência e Agrotecnologia. Editora da Universidade Federal de Lavras (UFLA), v. 33, n. 3, p. 875-881, 2009.