Five healthy Friesian calves and five double-muscled Belgian White and Blue calves were studied, using a 99m Technetium (99mTc) aerosol inhalation combined with a 99mTc macroaggregate injection and collimated scintillation counters. The inhalation-to-perfusion ratio (I/P) was calculated for both left and right sides of the thorax at four sites situated at three different levels in the auscultatory area on the same vertical axis and at a more anterior site just behind the scapulohumeral joint. I/P was higher in the left than in the right hemithorax. In both breeds, a vertical and a horizontal gradient were observed. I/P was higher in the lower and in the more cranial zones of the lungs. However the vertical gradient was more pronounced in Friesian calves while the horizontal one was greater in Belgian White and Blue animals. It was concluded that the factors affecting the topographical distribution of pulmonary ventilation and perfusion seem to be different in calves as compared to other species.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/BF00343260 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of low phosphorus diets on phosphorus balance and plasma concentrations of 25-hydroxyvitamin D3, and carboxy-terminal collagen crosslinks during the transition period in dairy cows.
J Dairy Sci
January 2025
Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CL Utrecht, the Netherlands.
Our aim was to determine the effects of P intake on P balance, serum parathyroid hormone (PTH) levels and bone resorption during the final 4 weeks prepartum and the first 8 weeks of lactation. Sixty pregnant multiparous Holstein Friesian dairy cows were assigned to a randomized block design with repeated measurements and dietary treatments arranged according to a 2 × 2 factorial design. The experimental diets contained 3.
View Article and Find Full Text PDFThe efficacy of toltrazuril for prevention of oriental theileriosis (Theileria orientalis Ikeda genotype) in Friesian calves.
Aust Vet J
January 2025
The University of Sydney, Sydney, New South Wales, 2006, Australia.
The aim of this non-blinded, randomised, controlled study was to determine the efficacy of toltrazuril for the prevention of oriental theileriosis in calves. Thirty calves were infected with Theileria orientalis Ikeda genotype through the application and retention of infected female bush ticks (Haemaphysalis longicornis). 15 Group 1 calves were treated with a single, oral dose of toltrazuril at the dose registered in Australia for coccidiosis (15 mg/kg), concurrently with tick infection, and 15 Group 2 (control group) calves were untreated.
View Article and Find Full Text PDFDairy Cattle and the Iconic Autochthonous Cattle in Northern Portugal Are Reservoirs of Multidrug-Resistant .
Antibiotics (Basel)
December 2024
UCIBIO-Applied Molecular Biosciences Unit, University Institute of Health Sciences (1H-TOXRUN, IUCS-CESPU), Avenida Central de Gandra 1317, 4585-116 Paredes, Portugal.
Animals destined for human consumption play a key role in potentially transmitting bacteria carrying antibiotic resistance genes. However, there is limited knowledge about the carriage of antibiotic-resistant bacteria in native breeds. We aimed to characterize the phenotypic profiles and antibiotic resistance genes in isolated from bovines, including three native Portuguese bovine breeds.
View Article and Find Full Text PDFImpact of rumen-protected glucose on performance, milk composition, and selected blood metabolites of early lactating Holstein Friesian cows.
Front Vet Sci
December 2024
Institute of Dairy and Animal Sciences, University of Agriculture, Faisalabad, Pakistan.
Introduction: High-producing dairy cows often face calving stress and reduced feed intake during the transition period, leading to body fat mobilization to meet production demands. Supplementing rations with energy-dense sources like rumen-protected glucose (RPG) may enhance production performance in early lactation.
Methods: This study evaluated the effects of RPG supplementation on feed intake, body condition score (BCS), production performance, and blood metabolites in 32 early-lactation Holstein Friesian cows (6 ± 1 DIM; milk yield: 30 ± 5 kg/day; body weight: 550 ± 50 kg; BCS: 3.
Four SNPs in the untranslated region of the NOTCH2 gene involved in reproductive traits in fertile and anestrum Holstein Friesian cattle.
BMC Vet Res
December 2024
Department of Research, Research and Development Station for Bovine, Arad, Romania.
Background: There are no studies belong NOTCH2 gene polymorphism in relation to reproductive and productive traits in Holstein cattle. The objective of the present study was to investigate the effect of NOTCH2 gene polymorphisms on productive and reproductive performance of fertile and anestrum cattle.
Methods: The cattle were classified into anestrus for 3-12 months postpartum (n = 115, 37.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!