Are Dual-Purpose Chickens Twice as Good? Measuring Performance and Animal Welfare throughout the Fattening Period.

Abstract

Simple SummaryDual-purpose chickens and native chicken breeds have gained public interest and their agricultural use has increased. Furthermore, the fattening of so-called “brother cockerels” of laying hens has been periodically discussed, with an increasing number of questions raised about their high feed consumption and low fleshiness and, therefore, low sustainability. This study carefully examines chickens—native, hybrid dual-purpose, and layer lines—to assess their performance in meat production, in addition to animal-based welfare indicators and sampling methods. Compared to modern broilers, tested alternatives gain less meat, consume more food, and need a longer fattening period. However, advantages may still exist in terms of animal welfare and with regard to ethically justifiable animal production in the future. Of the three alternatives tested, dual-purpose hybrids may be suitable for niche production, but further research is needed on economically sound feed management and adapted breeding strategies for dual-purpose chickens.Chickens are the world’s most widely used farm animal and have a significant genetic diversity. In the current study, we investigated three strains for their suitability as dual-purpose chickens, with a focus on the fattening ability and welfare of the cockerels: 1. layer cockerels (Lohmann Brown, LB, n = 714); 2. cockerels of a dual-purpose hybrid (Lohmann Dual, LD, n = 844); and 3. cockerels of a native breed (Rhinelander, RL, n = 458). Chicks were raised under identical conditions and marked individually to compare focus and random sampling methods for weighing birds weekly. Because chicks of dual-purpose origins are usually raised mixed-sex, cockerels and pullets were weighed and observed together until sexes the were identifiable at week 10 of their life. During the 10th to 20th week of life, investigations were continued on 100 cockerels per genotype. Key figures for growth performance, such as feed conversion ratio (FCR) and European production efficiency factor (EPEF), were also calculated at weekly intervals. LD cockerels showed considerable growth performance (p < 0.001 compared to LB, RL, 2 kg at 9 weeks), whereas LB reached a live weight of 2 kg at 13 weeks and RL at 15 weeks of age. Genotype-dependent differences were also evident, with favorable FCR and EPEF for LD, intermediate for LB, and unfavorable for RL (all p < 0.001). The results of the FCR and EPEF suggest that cockerels should be slaughtered around week 8 of life, although only the carcass of the LD might be marketable. Thus, the optimal time of slaughter based on production parameters such as FCR and EPEF is different from the time when the animal reaches a marketable 2 kg live weight. Animal-based welfare indicators revealed that the RL are not adapted to production environments, including those that are extensive. Further research aimed at adapted feed management, including better FCR, and animals adapted to the respective production environments is necessary to improve alternative poultry production in the future.