Effects of -mannanase on Egg Production Performance, Egg Quality, Intestinal Microbiota, Viscosity, and Ammonia Concentration in Laying Hens
R. bras. Ci. avíc.
; 22(1): eRBCA-2019-1180, 2020. tab
Article
em En
| VETINDEX
| ID: vti-29295
Biblioteca responsável:
BR68.1
Localização: BR68.1
ABSTRACT
Two experiments were conducted to evaluate the effects of -mannanase on egg production performance, egg quality, intestinal microbiota, viscosity, and ammonia concentration in laying hens. In Exp. 1, two hundred and seventy 30-wk-old Hy-Line Brown laying hens were assigned to 6 diets arranged in a 3 × 2 factorial of three levels of MEn and CP [(a corn-soybean meal based diet (HEHP), a diet containing 50 kcal of MEn/kg and 1.0% less energy and CP than the HEHP (MEMP), and a diet containing 80 kcal of MEn/kg and 1.5% less energy and CP than HEHP (LELP)], and -mannanase supplementation (0 or 0.04%). In Exp. 2, A total of two hundred and sixteen62-wk-old Hy-Line Brown laying hens were assigned to 6 dietary treatments in a 3 × 2 factorial arrangement. In Exp. 1, -mannanase supplementation increased egg production rate in hens fed LELP diet, but not in those fed HEHP or MEMP diet (interaction, p 0.01), and the interaction was significant (p 0.01) for egg mass. -mannanase supplementation decreased (p 0.05) ammonia concentration. In Exp. 2, the supplementation of -mannanase increased egg production rate and egg mass in hens fed LELP diet, whereas no differences were found in those fed HEHP or MELP diet (interaction, p 0.01). The supplementation of -mannanase in a lower energy and protein diet resulted in similar production performance when compared to high-energy and high-protein diet during early and late stages of egg production.(AU)
Palavras-chave
Texto completo:
1
Base de dados:
VETINDEX
Assunto principal:
Galinhas
/
Ovos
/
Amônia
Limite:
Animals
Idioma:
En
Revista:
R. bras. Ci. avíc.
/
Rev. bras. ciênc. avic
Ano de publicação:
2020
Tipo de documento:
Article