Background/introduction: In the absence of evidence-based findings for Saxonian

Chicken (SaChi) and German Langshan bantam (GLB), which are indigenous endangered

German fancy chicken breeds, the objective of the present study was to characterise

their growth performance and meat potential in an extensive free-range system

Methods: A total of 340 hatching eggs from SaChi and 439 eggs from GLB were provided

by private breeders, from which 263 SaChi (77.3%) and 174GLB(39.6%) hatched

(p < 0.001)

Results: By week 20, SaChi reached body weights of 2362.3 ± 315.3 g (mean ± SD;

roosters) and 1624.7 ± 158.9 g (hens), while GLB weighed 1089.7 ± 148.3 g (roosters)

and 820.4 ± 89.5 g (hens). Fitting the non-linear regression of growth data to the

Gompertz function estimated asymptotic body weights of 3131.4, 2363.9, 1359.2 and

1107.3 g, with inflection point times of 10.5, 10.3, 9.2 and 9.3 weeks in male SaChi,

female SaChi, male GLB and female GLB, respectively.Moderate plumage damage was

observed on days 18, 35, 53, 70 and 105 in SaChi and on days 53, 70 and 105 in GLB,

while all birds presented completely intact plumage on day 140. Using a binary logistic

regression model, breed, age and sex were shown to affect the plumage condition

(p < 0.001 each). Roosters were slaughtered in week 20. No breed effects were

detected in the carcass yield (SaChi: 68.8 ± 1.7%, GLB: 69.7 ± 1.8%) (p = 0.135) or

abdominal fat share (SaChi: 0.89±0.15%,GLB: 1.08±0.14%) (p=0.281). The percentage

of valuable cuts (breast fillets and legs) in the carcass was 43.8±1.9% for SaChi and

43.1 ± 3.0% for GLB (p = 0.490)

Discussion/conclusions: In conclusion, this study provides insights into the performance

traits and welfare indicators during the rearing of two endangered German

chicken breeds.