♦ Corresponding author: rzadamcz@ cyfronet. pl abstract Perception of the environment by
farm animals is fundamental for expression of behaviour and of their adaptation to different …

This scientific opinion focuses on the welfare of laying hens, pullets and layer breeders on
farm. The most relevant husbandry systems used in Europe are described. For each system …

Traditionally, the contribution of applied ethology to animal welfare science has
concentrated on understanding the reactions of animals to their housing conditions …

Poultry production is the most rapidly expanding agricultural industry. Consumer awareness
of animal welfare has grown in recent years, and as a result, consideration for higher-quality …

Genetics is key to the improvement of welfare in broiler chickens at both juvenile and adult
(breeder) stages but progress is hampered currently by the seemingly conflicting demands …

Broiler breeder hens grow more efficiently and are leaner than ever before due to positive
results from broiler genetic selection strategies. Quantitative feed restriction is used to limit …

Genome wide association study was conducted using a mixed linear model (MLM)
approach that accounted for family structure to identify single nucleotide polymorphisms …

In many avian species, males display dramatic and conspicuous ornaments that serve as
honest signals of quality to females. The phenotype-linked fertility hypothesis suggests that …

In natural mating systems in which broiler breeder males compete for females, reproductive
behavior plays an important role in male fertility, along with sperm competition and …

An experiment was conducted to investigate the effects of a standard diet twice a day or split-
feeding in broiler breeders on production performance, eggshell quality, incubation traits …