产蛋期太行鸡专用预混料研究.

The experiment was to screen the special premix for Taihang chickens during the laying period, the effect of the premix on the production performance, egg quality, serum antioxidant capacity and economic benefits of Taihang chickens during the laying period were studied. 432 healthy 280-day-old Taihang chickens were selected and randomly divided into six groups, with six replicates in each group and 12 chickens in each replicate. Chickens in group A (control group) were fed with premix for commercial laying hens, and chickens in group D (100% premix) were fed with premix prepared according to chicken breeding standards and the physiological characteristics of Taihang chickens. Taihang chickens in group B, group C, group E and group F were fed with vitamin and trace element levels reduced by 50% and 25% and increased by 25% and 50% on the basis of group D. The results showed that compared with the control group, the egg production rate of group B and group C significantly decreased (P<0.05), and the feed-to-egg ratio significantly increased (P<0.05). The eggshell strength of group F was significantly higher than that of group B and group C (P<0.05). Compared with the control group, serum glutathione peroxidase (GSH-Px) activity in group B and group C was significantly reduced (P<0.05). The total antioxidant capacity (T-AOC) of group B was significantly reduced (P<0.05). The economic benefits of group D, group E and group F were 6.00%, 3.65% and 0.01% higher than those of control group, respectively. The economic benefits of group B and group C were lower than the control group by 16.39% and 16.61%. The experiment indicates that the premix D~F can guarantee the normal production performance, egg quality and serum antioxidant capacity of Taihang chickens during the peak laying period. Group D has the highest economic benefit and can be used as a special premix for Taihang chickens during the peak laying period. [ABSTRACT FROM AUTHOR]