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 Pages: 180-189 Volume: 71 Issue: 4 Year: 2026 DOI: 10.17221/96/2025-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/96/2025-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/96/2025-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202604-0001.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:4:id:96-2025-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Hudu Ramalan Abdullahi Author-Workplace-Name: Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Workplace-Name: Department of Animal Science, Federal University of Lafia, Lafia, Nasarawa State, Nigeria Author-Name: Abubakar Abubakar Ahmed Author-Workplace-Name: Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Workplace-Name: Department of Preclinical Sciences, Faculty of Veterinary Medicine, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Name: Suriya Kumari Ramiah Author-Workplace-Name: Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Workplace-Name: School of Veterinary Medicine, International Medical University, MRANTI Technology Park, Bukit Jalil, WP Kuala Lumpur, Malaysia Author-Name: Hasliza Abu Hassim Author-Workplace-Name: Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Workplace-Name: Department of Preclinical Sciences, Faculty of Veterinary Medicine, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Name: Yong Meng Goh Author-Workplace-Name: Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Author-Workplace-Name: Department of Preclinical Sciences, Faculty of Veterinary Medicine, University of Putra Malaysia, UPM Serdang, Selangor, Malaysia Title: A systematic review on the modulation of heat shock protein 70 in broilers at different stages of growth under thermal stress Abstract: This systematic review synthesises evidence from published articles investigating nutritional strategies to modulate heat shock protein 70 (HSP70). A total of 1 616 records were identified from four databases and snowballing. After screening and eligibility assessment, 25 studies comprising 29 reports published between 2004 and 2025 were included. The analysis shows that targeted interventions particularly antioxidants (vitamins C, E, and selenium), amino acids and their derivatives (methionine, betaine), and phytogenic compounds effectively downregulate HSP70 expression in a dose or tissue-dependent manner. This modulation is associated with improved growth performance, enhanced redox balance, and normalised stress hormone profiles. Key findings indicate that synergistic combinations outperform single additives in suppressing HSP70 and improving carcass yield under chronic heat stress (32-38 °C); the early-life nutrient delivery modulates HSP70 expression and influences post-hatch thermotolerance; and organic mineral or methionine hydroxy analogue are more effective than inorganic forms. However, efficacy varies by life stage, with most studies focused on Ross and Cobb genotypes, and is influenced by gut microbiota interactions. Major research gaps remain, including defining stage-specific optimal HSP70 thresholds, clarifying links between HSP70 modulation, immunity or gut health, understanding long-term effects of early-life nutritional programming, and determining the influence of administration routes on nutrient efficacy. Keywords: antioxidant, gene expression, intervention, nutrient, thermotolerance Journal: Czech Journal of Animal Science Pages: 141-158 Volume: 71 Issue: 4 Year: 2026 DOI: 10.17221/1/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/1/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/1/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202604-0002.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:4:id:1-2026-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 Pages: 170-179 Volume: 71 Issue: 4 Year: 2026 DOI: 10.17221/29/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/29/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/29/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202604-0003.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:4:id:29-2026-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Eva Mlyneková Author-Workplace-Name: Institute of Animal Husbandry, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Stanislav Zaťko Author-Workplace-Name: Institute of Animal Husbandry, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Marko Halo Author-Workplace-Name: Institute of Animal Husbandry, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Ivan Imrich Author-Workplace-Name: Institute of Animal Husbandry, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Marko Halo Jr Author-Workplace-Name: Institute of Applied Biology, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Energy balance and its relationship to body weight and body condition in grazing horses Abstract: Equine obesity currently represents a significant welfare concern, with its development influenced by seasonal changes in the nutritional value of pasture, which substantially affect the animals' energy balance. The aim of this study was to evaluate the seasonal dynamics of pasture nutritional composition, assess the balance between energy requirements and actual intake of horses during the grazing season, and determine the impact of these factors on body weight and body condition. Pasture was analysed across three seasonal periods: T1 (May), T2 (July), and T3 (September). The highest concentration of digestible energy in pasture was recorded in T1 (10.81 MJ/kg DM), while the lowest was observed in T2 (9.67 MJ/kg DM). In T1, digestible energy intake (DEi; 98.02 MJ/day) was markedly higher than the energy requirement (61.94 MJ/day), resulting in a positive energy balance (36.08 MJ/day). This surplus was accompanied by a significant increase in body weight from 444.6 kg to 534.7 kg (P = 0.006 1) and an increase in body condition score (BCS) from 5.1 to 6.7 (P = 0.000 1). In the subsequent periods (T2 and T3), when the energy balance was close to equilibrium (-0.02 and 0.14 MJ/day), no further significant changes were observed in body weight (534.7 vs 535.0 kg; P > 0.05) or BCS (6.7 vs 6.6; P > 0.05). Changes in BCS showed a strong positive relationship with the difference between DE intake and requirement (r = 0.696 1; P = 0.000 7). The results confirm that seasonal energy surplus, particularly at the beginning of the grazing season, represents a significant risk factor for body fat accumulation in adult horses maintained on ad libitum pasture. Keywords: body condition score, body weight, energy balance, horse, pasture Journal: Czech Journal of Animal Science Pages: 159-169 Volume: 71 Issue: 4 Year: 2026 DOI: 10.17221/54/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/54/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/54/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202604-0004.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:4:id:54-2026-CJAS