Esleibe Ghion

Efeito de diferentes métodos de descanso forçado sobre o desempenho de poedeiras

One experiment was conducted to compare productive performance of laying hens of two strains: Babcock (light) and Hisex Brown (semi-heavy), exposed to forced molt according to the following treatments: A- Feed restriction (11 days), B- Salt restriction (42 days), C- high dietary zinc (2.0% of ZnO during 11 days) and D- High dietary iodine (0.6852% de KI during 42 days). The experimental design was a random block design. The birds (128 by strain) were 66 weeks old at the beginning of the molt phase. Birds on treatments A and C had better production in the second cycle and better feed conversion. Birds on treatment A produced the heaviest eggs with lowest quality (both internal and external). Percentage of production was not different among the strains tested, even though the lightweight birds showed a significantly better feed conversion and lower feed consumption. The semi-heavy strain produced significantly heavier eggs, with better internal quality but lower shell quality.

Desempenho e qualidade dos ovos de diferentes linhagens de poedeiras comerciais pós-muda forçada recebendo rações com níveis variáveis de cálcio

O experimento foi conduzido com o objetivo de comparar o desempenho produtivo de poedeiras, de 4 linhagens (Lohmann White, Babcock, Embrapa-011 e Lohmann Brown), pos-muda forcada recebendo diferentes niveis de calcio nas racoes (2, 3, 4, 5 e 6%). O delineamento experimental foi em blocos ao acaso, sendo utilizadas 100 aves por linhagem, com 74 semanas de idade. As aves que receberam 2% de calcio apresentaram menor consumo de racao e producao de ovos; os maiores niveis de calcio aumentaram a qualidade da casca dos ovos. A cor da gema foi menor para os niveis 2 e 6%. As variaveis peso dos ovos, Unidades Haugh e cor da gema foram relacionadas com a linhagem, e a Embrapa-011 apresentou o pior desempenho entre as linhagens.