Template-Type: ReDIF-Article 1.0 Author-Name: Jun Xiao Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Name: Xue Han Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Name: Wei Zhao Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Xin Li Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Zhiwen Xuan Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Zhibao Wang Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Qing He Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Yang Gao Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Tingwei Wang Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Songze Li Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Name: Yuanhong Xia Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Name: Tao Wang Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Zhe Sun Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Workplace-Name: College of Life Science, Jilin Agricultural University, Changchun, P.R. China Author-Name: Yuguo Zhen Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Xuefeng Zhang Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Author-Workplace-Name: Postdoctoral Scientific Research Workstation, Feed Engineering Technology Research Center of Jilin Province, Changchun Borui Science & Technology Co. Ltd., Changchun, P.R. China Author-Name: Xue Chen Author-Workplace-Name: JLAU-Borui Dairy Science and Technology R&D Center, Key Laboratory of Animal Nutrition and Feed Science of Jilin Province, Key Laboratory of Animal Production Product Quality and Security Ministry of Education, College of Animal Science and Technology, Jilin Agricultural University, Changchun, P.R. China Title: Dietary yeast culture supplementation improves meat quality and fat metabolism-related gene expression in lambs Abstract: This study evaluated the effects of dietary yeast culture (YC) supplementation on lamb growth performance and meat quality. After 14 days of acclimation, 20 three-month-old lambs (30.46 ± 1.77 kg) were randomly assigned to the control (CON, basal diet) or YC-supplemented group (0.625 g/kg DM) for 50 days. While YC induced no significant improvements in growth parameters (average daily gain, average daily feed intake, and feed to gain ratio; P > 0.05), it enhanced the longissimus thoracis (LT) meat quality by elevating the L* (lightness) and a* (redness) values (P < 0.05), reducing shear force (P < 0.05), increasing intramuscular fat (EE, P < 0.05), and decreasing crude protein (P < 0.05). YC modified fatty acid profiles by reducing atherogenic saturated fatty acids (P < 0.05) and elevating C16:1 (P < 0.05). Transcriptional analysis revealed the depot-specific regulation: YC suppressed subcutaneous adipogenesis via downregulation of PPARγ/SREBP-1/HSL and upregulation of LPL and promoted intramuscular fat deposition in LT through the coordinated activation of PPARγ/SREBP-1/FAS/ACC and inhibition of LPL (P < 0.05). These findings demonstrate the capacity of YC to optimise meat sensory attributes and lipid healthfulness through tissue-specific metabolic modulation, supporting its application as a functional feed additive in precision lamb production. Keywords: fatty acid, growth performance, transcriptional regulation, yeast culture Journal: Czech Journal of Animal Science Number: 45943 Volume: preprint DOI: 10.17221/96/2025-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/96/2025-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-000004-5943.txt Handle: RePEc:caa:jnlcjs:v:preprint:id:96-2025-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Natalie Klessy Author-Workplace-Name: Department of Animal Breeding, Animal Nutrition and Biochemistry, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Brno, Czech Republic Author-Name: Eva Straková Author-Workplace-Name: Department of Animal Breeding, Animal Nutrition and Biochemistry, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences Brno, Brno, Czech Republic Title: The effect of cattle breed on the quality of intramuscular fat Abstract: The aim of the study was to verify whether differences in intramuscular fat quality, evaluation based on fatty acid profile and ratios, occur between cattle genotypes - the combined performance cattle breed Czech Fleckvieh and the beef breed Aberdeen Angus - under identical rearing conditions (same pasture location and nutritional management) with extensive grazing. The results of observation show the difference in the quality of intramuscular fat of bulls with combined performance and bulls with meat performance in extensive pastoral farming. Breed differences were reflected by a statistically significantly higher mean intramuscular fat (P ≤ 0.05) in the beef cattle breed (149 ± 60.1 g/kg dry matter) compared to the combined performance breed (120 ± 51.8 g/kg dry matter). A higher saturated fatty acid (SFA) value of 53.4 ± 22.2 g/kg dry matter was observed in the beef cattle breed compared to SFA 40.8 ± 18.9 g/kg dry matter (P ≤ 0.05) in the combined performance cattle breed; a higher monounsaturated fatty acid (MUFA) value of 43.8 ± 26.3 g/kg dry matter compared to a MUFA value of 42.3 ± 20.8 g/kg dry matter (P > 0.05); and a higher value of polyunsaturated fatty acids n-3 (PUFA n-3) 0.76 ± 0.33 g/kg dry matter (P ≤ 0.05) compared to PUFA n-3 0.48 ± 0.21 g/kg dry matter in combined performance cattle breed. A higher value of polyunsaturated fatty acids n-6 (PUFA n-6) 3.66 ± 1.39 g/kg dry matter was found in the combined performance cattle breed compared to the meat cattle breed with PUFA n-6 3.54 ± 0.96 g/kg dry matter (P > 0.05). A more favourable n-6/n-3 PUFA ratio was observed in the Aberdeen Angus (P ≤ 0.05). The results suggest that the different genotypes of the bull breeds studied, reared on extensively used pasture, may influence the amount of intramuscular fat and its quality. Keywords: Aberdeen Angus, Czech Fleckvieh, dietary fat, fatty acid, pasture Journal: Czech Journal of Animal Science Number: 48104 Volume: preprint DOI: 10.17221/29/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/29/2026-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-000004-8104.txt Handle: RePEc:caa:jnlcjs:v:preprint:id:29-2026-CJAS