Impact of increased pre-start diet density on broiler chick behavior, corticosterone levels, and performance responses under cold stress during early life.

This study assessed the effects of increased pre-start diet density on the metabolism, crop filling, and overall performance of broilers under cold stress during their initial 14 days of life. Using 576 one-day-old Cobb500 male chicks from 27-week-old breeders, the experiment employed a 2 × 2 arrangement, varying thermal conditions (thermoneutrality or cold stress at 18 °C for 8 h) and pre-start diet composition (21.5% crude protein, 2970 kcal/kg or 22.

Changes in the Transcriptome Profile in Young Chickens after Infection with LaSota Newcastle Disease Virus.

Understanding gene expression changes in chicks after vaccination against Newcastle Disease (ND) can reveal vaccine biomarkers. There are limited data on chicks' early immune response after ND vaccination. Two trials focused on this knowledge gap.

Sanitization at different times after floor egg collection for hatchability, microbiological quality, and performance of broilers.

In this study, the effects of egg type and sanitization time on eggshell and yolk sac microbiological quality, hatchability, and broiler performance at 7 and 35 d of age were evaluated. A total of 3,440 eggs from a commercial flock Cobb500 were randomly assigned in a 2 × 2 factorial scheme, separated by the type of egg (clean nest or floor) and eggs sanitization at 30 or 120 min after collection, totaling 4 treatments. After hatching, 312 male chicks were randomly selected and distributed according to treatment.

Floor eggs: Hatchability, microbiological analysis, and effects of post-hatch use of ceftiofur on performance of broiler chicks.

The present study aimed to determine the effects of egg type (nest clean or floor eggs) on eggshell microbiological, hatching performance, chick quality, yolk sac microbiology, and the interaction between egg type and post-hatch use of ceftiofur on broiler performance at 7, 14, 21, 28 and 35 days. A total of 2500 fertile eggs were obtained from a commercial flock of Cobb Slow® broiler breeders. Half of the eggs were collected directly from the floor, and the other half were collected from the nests.