Performance, egg quality, and immune response of laying hens fed diets supplemented with mannan-oligosaccharide or an essential oil mixture under moderate and hot environmental conditions

Abstract

In total, 432 thirty-six-week-old laying hens were fed a basal diet supplemented with mannan-oligosaccharide (MOS) or an essential oil mixture (EOM) from 36 to 51 wk of age. Hens were divided into 3 equal groups replicated 6 times with 24 hens per replicate. No significant difference was observed among the dietary treatments in terms of performance indices. Different from the dietary manipulation, high environmental temperatures negatively influenced all of the laying performance traits except the feed conversion ratio in association with the diminished feed consumption. The MOS, and particularly the EOM, tended to alleviate the deleterious effect of heat stress on BW gain. Mortality was higher in MOS-fed hens than with other treatments. A supplementation diet with MOS or EOM provided increments in eggshell weight (P < 0.01). Relative albumen weight was significantly decreased (P < 0.05) in response to EOM or MOS supplementation; however, this was not the case in the yolk weight rate. The MOS decreased albumen height and Haugh unit (P < 0.05). High environmental temperatures hampered entire egg quality characteristics except for the eggshell breaking strength and egg yolk weight. These results indicated that heat stress adversely affected both productive performance and egg quality. As for the results of this study, neither MOS nor EOM was efficacious in improving efficiency of egg production and stimulating humoral immune response in laying hens reared under moderate and hot climatic conditions. However, the ameliorative effect exerted by MOS and EOM on eggshell characteristics is conclusive.

Extratos etanólicos de manga como antioxidantes na alimentação de poedeiras

“…A ausência de influência significativa de fontes naturais de antioxidantes sobre o consumo de ração (Radwan et al, 2008;Zhao et al, 2011;Özeku et al, 2011;Bozkurt et al, 2012) e o desempenho das galinhas (Özeku et al, 2011;Bozkurt et al, 2012) que, embora a inclusão de 1% de orégano, alecrim ou tomilho, ou de 0,5% de açafrão não tenha influenciado o consumo, as poedeiras tiveram desempenho melhorado com esses tratamentos. Além disso, Zhao et al (2011) verificaram que a adição de gengibre em pó na ração de poedeiras aumenta a massa do ovo.…”

“…A adição dos extratos produziu efeito semelhante aos relatados por Özeku et al (2011), que apenas constataram aumento na altura do albúmen e nos valores de unidade Haugh, em ovos de poedeiras alimentadas com uma mistura de óleos essenciais. Entretanto, Bozkurt et al (2012) pesquisadores (Tserveni-Gousi et al, 2006;Radwan et al, 2008;Shahryar et al, 2010;Zhao et al, 2011). Segundo Shahryar et al (2010), o nível de Tbars nos ovos, ao final do período de armazenamento, está diretamente relacionado à composição lipídica e à transferência do antioxidante para os ovos.…”

Probiotic mixture ameliorates heat stress of laying hens by enhancing intestinal barrier function and improving gut microbiota

“…HS is a hazard that influences the performance of laying hens (Bozkurt et al 2012), and it has been demonstated that for every 1 C increase in temperature above 32 C, the feed intake decreases by 4.6% (Song et al 2012). And more than 32 C will lead to physiological function disorder of laying hens, producing various non-specific responses.…”

“…Numerous strategies have been employed to reduce the HS effects on laying hens, including the addition of vitamin C (Torki et al 2014), c-aminobutyric acid , regulatory peptides (Song et al 2012), and mannan-oligosaccharides (Bozkurt et al 2012) to the diet.…”

An Updated Review on Chicken Eggs: Production, Consumption, Management Aspects and Nutritional Benefits to Human Health

“…Over all egg quality is influenced by several factors including rearing, temperature, humidity, handling, storage, and egg age [93]- [95]. Hen's feed may also play a crucial role in maintaining the quality of eggs.…”