A study was conducted to elucidate the relative susceptibility of broiler breed birds to synovitis and the relative resistance of laying breed birds to this disease. It was shown that difference in structure and chemical composition of fibrous connective tissue can be associated with this difference in susceptibility. A loose structure of fibrous connective tissue (common in broiler breed birds) appears to predispose to synovitis, whereas a compact structure (common in laying breed birds) can be associated with resistance to synovitis. The most fundamental approach to the synovitis problem would be the breeding of broiler breed birds with a compact structure of fibrous connective tissue. However, this approach does not seem to offer favourable prospects in the near future. For the present, synovitis resistance in broiler parents can be enhanced by practising a management scheme aiming at activation of the birds.
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http://dx.doi.org/10.1080/01652176.1984.9693925 | DOI Listing |
J Anim Ecol
January 2025
Institute of Avian Research, Wilhelmshaven, Germany.
Whilst efficient movement through space is thought to increase the fitness of long-distance migrants, evidence that selection acts upon such traits remains elusive. Here, using 228 migratory tracks collected from 102 adult breeding common terns (Sterna hirundo) aged 3-22 years, we find evidence that older terns navigate more efficiently than younger terns and that efficient navigation leads to a reduced migration duration and earlier arrival at the breeding and wintering grounds. We additionally find that the age-specificity of navigational efficiency in adult breeding birds cannot be explained by within-individual change with age (i.
View Article and Find Full Text PDFElife
January 2025
Department of Evolutionary and Environmental Biology and Institute of Evolution, University of Haifa, Haifa, Israel.
Optimal foraging theory posits that foragers adjust their movements based on prey abundance to optimize food intake. While extensively studied in terrestrial and marine environments, aerial foraging has remained relatively unexplored due to technological limitations. This study, uniquely combining BirdScan-MR1 radar and the Advanced Tracking and Localization of Animals in Real-Life Systems biotelemetry system, investigates the foraging dynamics of Little Swifts () in response to insect movements over Israel's Hula Valley.
View Article and Find Full Text PDFSci Rep
January 2025
British Trust for Ornithology, The Nunnery, Thetford, Norfolk, IP24 2PU, UK.
Understanding the distribution of breeding populations of migratory animals in the non-breeding period (migratory connectivity) is important for understanding their response to environmental change. High connectivity (low non-breeding population dispersion) may lower resilience to climate change and increase vulnerability to habitat loss within their range. Very high levels of connectivity are reportedly rare, but this conclusion may be limited by methodology.
View Article and Find Full Text PDFViruses
January 2025
Department of Avian and Rabbit Medicine, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt.
The present study aims to better understand the nature of currently circulating GPV strains and their pathological impact on the immune system during natural outbreaks among different duck breeds in Egypt. For this purpose, 99 ducks (25 flocks) of different breeds, aged 14-75 days, were clinically examined, and 75 tissue pools from the thymus, bursa of Fabricius, and spleen were submitted for virus detection and identification. Clinical and postmortem findings were suggestive of GPV infection.
View Article and Find Full Text PDFViruses
December 2024
Sovon Dutch Centre for Field Ornithology, 6525 ED Nijmegen, The Netherlands.
Highly pathogenic avian influenza (HPAI) epizootics have caused repeated mass mortality events among wild birds. The effect of the infection is potentially detrimental for a variety of bird species, including the Peregrine Falcon (). The numbers of wintering and breeding Peregrine Falcons in the Netherlands have recently declined.
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