Objetive. To determine the effects of high temperature, the high humidity and the index on production performance in layer chickens supplemented with vitamins C and E. Materials and methods. The experiment was carried out from July 14th to August 15th. A total of 720 L33 layer chickens, 39 weeks old, were divided at random into four groups (180 birds/group), by replicates (n=4): Control Group) was fed with a basal diet and treatment groups were fed with the basal diet supplemented with either 150 mg of l-ascorbic acid/g of diet (Group Vit. C) or 150 mg of dl-α-tocopherol acetate /kg, of diet (Group Vit. E), and 150 mg of l-ascorbic acid /kg of diet plus 150 mg of dl-α-tocopherol acetate/kg of diet (Group Vit C + E). Results. Egg/bird were higher (p<0.05) in all treatment groups when compared to control group, but p value was highly significant in vitamin E treated group. Likewise, the laying index was different (p<0.05) in all treatment groups when compared to control, and P value was highly significant in vitamin E treated group. Although, viability was not affected by vitamin C, vitamin E and vitamin C+E groups when compared to control (p>0.05). However, feed consumption and conversion were different (p<0.05) in treatment groups when compared to control group. Conclusions. Dietary supplementation with 150 mg vitamin C and/or 150 mg vitamin E increased production performance in heat stressed layer chickens. RESUMENObjetivo. Investigar los efectos de la alta temperatura y humedad relativa y su índice sobre el rendimiento productivo en las gallinas ponedoras suplementada con las vitaminas C y E. Materiales y métodos. Se realizó el experimento desde 14 de Julio a 15 de Agosto. 720 gallinas ponedoras L33, y de 39 semanas de edad, fueron dividas en cuatro grupos de 180 aves. Se suministró un grupo con dieta basal (Control) y los grupos de tratamientos fueron suministrados con dieta basal y suplementada con 150 mg de acido l-ascórbico/kg de dieta (grupo vitamina C), 150 mg de acetato dl-α-tocoferol/kg de dieta (grupo vitamina E), mientras el último grupo, se suministró 150 mg de acido l-ascórbico/kg de dieta mas 150 mg de acetato dl-α-tocoferol/kg de dieta (grupo vitamina C+E). Resultados. Huevo/ave fueron significativamente (p<0.05) mayor en todos los grupos tratados en comparación con el control, pero el p fue más alta en el grupo tratado con vitamina E. De mismo modo se observó una diferencia (p<0.05) significativa en el índice de postura en todos los grupos tratados en comparación con el control. Aunque la viabilidad no fue afectada en todos los grupos. Sin embargo, el consumo y la conversión alimentaria fueron diferentes (p<0.05) significativamente en todos los grupos tratados en comparación con el control. Conclusiones. La suplementacion dietética de 150 mg de vitamina C y/o 150 mg de vitamina E aumentó el rendimiento productivo en las gallinas ponedoras sometidas a estrés calórico.
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