Czech Journal of Animal Science, 2023 (vol. 68), issue 8
Diversity of the bovine genes IRAK1 and IRAK4 in the Toll-like receptor signaling pathwayOriginal Paper
Ladislav Tichý, Karel Novák, Jitka Kyselová, Michaela Pøibáòová, Jan Calta, Lubo¹ Vostrý
Czech J. Anim. Sci., 2023, 68(8):323-332 | DOI: 10.17221/137/2022-CJAS 
Innate immunity is the organism’s first line of defence, and the receptors of immune cells play a key role. Interleukin 1 receptor-associated kinase 1 and 4 (IRAK1 and IRAK4) are necessary for signal transmission from Toll-like receptors, which are the most important receptors of immune cells. The main objective of this study was to investigate the gene polymorphisms of IRAK1 and IRAK4 in Czech Fleckvieh cattle (CF) and to compare their diversity with other cattle breeds as there is still little information about these genes. PacBio Technology of next-generation sequencing (NGS) was used to detect genetic variability in 164...
Heat stress affects the milk yield, milk composition, serum oxidative status, and metabolites of Holstein cows during mid-lactationOriginal Paper
Xue Chen, Yongqiang Li, Jun Xiao, Jianan Dong, Wei Zhao, Zhiyi Han, Liang Xin, Guixin Qin, Tao Wang, Yuguo Zhen, Zhe Sun, Xuefeng Zhang
Czech J. Anim. Sci., 2023, 68(8):333-345 | DOI: 10.17221/2/2023-CJAS
Seasonal heat stress and metabolic disorders during mid-lactation are the main factors limiting production in Holstein cows, and several proteins and molecules involved in metabolic pathways are altered in response to stress. We investigated the effects of heat stress on the milk yield, milk composition, serum oxidative status, and metabolites in Holstein cows during mid-lactation to identify biomarkers associated with heat stress in serum and milk. Holstein cows with similar body condition scores (3.0 ± 0.25), parity (2.5 ± 0.5), and lactation days (115 ± 5 days) were selected in August (heat stress, HS, n = 20) 2017 and March...
Ameliorative effect of yeast cell walls on broiler chickens’ performance and gut health under coccidiosis challengeOriginal Paper
Shawkat Abdulrazaq M'Sadeq
Czech J. Anim. Sci., 2023, 68(8):346-355 | DOI: 10.17221/24/2023-CJAS
This study was conducted to evaluate the efficacy of yeast cell wall parts (YCW) in reducing the severity of coccidiosis in broiler chickens. One-day-old Ross 308 chicks (n = 320) were randomly allocated to 32 floor pens in two rooms with a 2 × 4 factorial arrangement of treatments. Factors were (1) challenge: negative or positive by room, (2) feed additive: control (none), anticoccidial (salinomycin at 60 mg/kg), YCW 0.1% or 0.2%. On day 8, none-challenged room was inoculated with saline, and challenged room was inoculated with 5 000 Eimeria tenella oocysts. Performance results showed that in challenged birds, feed conversion ratio (FCR)...
Dynamics of occurrence of defective eggs in initial laying lines of hensOriginal Paper
Tomá¹ Kopec, Ladislav Máchal, Eva Tùmová, Zuzana Reèková, Radek Filipèík
Czech J. Anim. Sci., 2023, 68(8):356-363 | DOI: 10.17221/54/2023-CJAS
The aim of this study was to monitor the occurrence of abnormal eggs in five initial laying lines of the domestic chicken (Gallus domesticus) between 2017 and 2021. The incidence of abnormal eggs, cracks, shell-less eggs, and double-yolk eggs were examined as part of the monitoring. Also assessed was the laying intensity, which ranged from 83.7% for the Barred Plymouth Rock (BPR) B line to 96.8% for the Rhode Island Red (RIR) A line. A statistically significant relationship between the line and control year was discovered for all varieties of abnormal eggs. The highest occurrence of cracks was in the RIR B line (2.2%). The BPR A line of hens...