Template-Type: ReDIF-Article 1.0 Author-Name: Minh Thai Nguyen Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Author-Name: Chung Chinh Doan Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Author-Name: Son Nghia Hoang Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Author-Name: Thi Anh Linh Dinh Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Author-Name: Han Thai Minh Nguyen Author-Workplace-Name: Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA Author-Workplace-Name: Life Science Department, University of New Hampshire at Manchester, Manchester, NH, USA Author-Name: Nhung Thi Nguyen Author-Workplace-Name: Department of Animal Biotechnology, Institute of Biology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Name: Hanh Van Nguyen Author-Workplace-Name: VNU University of Engineering and Technology, Hanoi, Vietnam Author-Name: Loan Thi Tung Dang Author-Workplace-Name: Faculty of Biology and Biotechnology, University of Science, Vietnam National University, Ho Chi Minh, Vietnam Author-Name: Nhan Lu Chinh Phan Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Author-Name: Long Thanh Le Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Author-Name: Chi Nguyen Quynh Ho Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Biotechnology Department, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam Author-Workplace-Name: Animal Biotechnology Department, Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam Title: In vitro proliferative capacity of satellite cells derived from Brown Vietnamese cattle (Bos indicus) Abstract: Finding suitable animal cell sources for cultured meat production remains a major challenge and continues to attract significant scientific interest, particularly in the development of bovine cultured meat. These cells must demonstrate robust proliferative capacity and the ability to maintain stemness. In this study, we aimed to evaluate the proliferation capacity and morphological alterations of bovine satellite cells (bSCs) derived from the Brown Vietnamese cattle during long-term in vitro expansion. The results showed that bSCs possessed a high proliferative potential, sustaining over 20 passages. These cells retained the expression of Pax7 and Pax3, specific markers for bovine satellite cells, in both early and late passages. Accumulation of bSCs in the G0/G1 phase at late passages indicated cell cycle arrest and reduced proliferation during prolonged culture. Morphological features of cellular senescence were also identified in late passage bSCs, including cytoplasmic enlargement, increased cell and nuclear size, and a decreased nucleocytoplasmic ratio. These findings suggest that bSCs from the Brown Vietnamese cattle represent a promising cell source for cultured meat research, demonstrating initial proliferative capacity and maintenance of cell identity, although proliferation potential declines under extended in vitro conditions due to cellular senescence. Keywords: bovine satellite cells, cultured meat production, in vitro expansion, myogenic markers, replicative senescence Journal: Czech Journal of Animal Science Pages: 361-370 Volume: 71 Issue: 8 Year: 2026 DOI: 10.17221/38/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/38/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/38/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202608-0001.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:8:id:38-2026-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Gerald Charles Emmans Author-Workplace-Name: Animal Breeding and Genomics, Scotland's Rural College (SRUC), Edinburgh, UK Author-Name: Robert Gous Author-Workplace-Name: School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Scottsville, South Africa Title: Gompertz - Pütter - Gompertz: Resolving two centuries of debate on laws of biological growth Abstract: The function of Gompertz (1825) can be derived from the growth equation of Pütter (1920), using the modified form proposed by Kühleitner et al. (2019). The genetic relative growth rate is derived as RG = dlnW/dt = BG.ln(AG/W). The genetic characteristics are AG, mature weight, and BG, the rate parameter; the state variable is weight, W. The integrated form is W = AG.exp[-exp-(G0 + BG.t)], where G0 = -ln[-ln(W0/AG)] and W = W0 when t = 0. The phenotypic equation is RP = qE.RG, where qE ≤ 1 is a measure of the quality of the environment. This function is consistent with data, collected where qE can reasonably be assumed to be 1, on the post-hatching growth of domestic and wild altricial birds, and with data from both the pre-natal and post-natal growth of domestic mammals. The mean value of the rate parameter, scaled to AG0.27, for mammals and precocial birds unselected by humans, is about 0.037, with considerable variation in avian species. Human selection for growth traits in poultry has nearly doubled the value. The mean value for seven altricial species was found to be nearly three times that for the average precocial species. The Gompertz function is consistent with data collected where the environment is not limiting. It follows logically that any function that is inconsistent with the Gompertz is inconsistent with relevant data, and therefore not a sufficient description of genetic growth. These results indicate that the Gompertz form is not merely a convenient empirical approximation, but a sufficient and biologically grounded description of genetic growth, against which alternative theoretical growth laws can be tested. It has the additional advantages of being simple and beautiful. Keywords: birds, Dynamic Energy Budget, mammals, ontogenetic growth, von Bertalanffy Journal: Czech Journal of Animal Science Pages: 380-395 Volume: 71 Issue: 8 Year: 2026 DOI: 10.17221/56/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/56/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/56/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202608-0002.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:8:id:56-2026-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Tarik Ayyilmaz Author-Workplace-Name: Odemis Vocational School, Dairy and Beef Livestock Program, Ege University, Izmir, Türkiye Author-Name: Can Uzmay Author-Workplace-Name: Department of Animal Science, Faculty of Agriculture, Ege University, Izmir, Türkiye Title: Herd management practices associated with bulk tank somatic cell count on dairy farms in Western Türkiye Abstract: The objective of this study was to determine the associations between bulk tank somatic cell count (BTSCC) and herd management practices on dairy farms in Western Türkiye. The material of the study consisted of 81 registered dairy farms. The farms were visited at approximately one-month intervals. Somatic cell count was determined electronically in the milk samples. According to the average BTSCC values of the farms, two different BTSCC categories were created (low: ≤400 103 cells/ml with 40 farms and high: >400 103 cells/ml with 41 farms). A questionnaire form was created to determine the herd management practices. The association between herd management practices and BTSCC categories was evaluated using the logistic regression analysis. According to the multivariate analysis, the probability for a farm to belong to the low BTSCC category increased when maintaining the clean resting surface for cows, having a calving pen, applying pre-milking teat disinfection, and shutting off the vacuum to the claw before removing the milking cluster. In addition, the probability for a farm to belong to the low BTSCC tended to be high when not preferring a non-stanchion barn with a hard floor (concrete etc.) as resting surface in milking cow housing. According to the univariate analysis, the probability for a farm to belong to the low BTSCC category was increased significantly when maintaining the cleaner exercise area, cooling the cows, keeping records about udder health, ensuring that the teats are dry while attaching the milking cluster, applying post-milking teat disinfection, and having an automatic cluster remover. Consequently, if improvements are made in these management practices, the incidence of udder health problems and consequently BTSCC will decrease. Keywords: bulk tank somatic cell count, dairy cattle, herd management practices Journal: Czech Journal of Animal Science Pages: 343-360 Volume: 71 Issue: 8 Year: 2026 DOI: 10.17221/62/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/62/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/62/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202608-0003.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:8:id:62-2026-CJAS Template-Type: ReDIF-Article 1.0 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 Author-Name: Anna Brázdilová 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: 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: Pavel Suchý 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: Comparison of carcass traits between mallard ducks (Anas platyrhynchos) and domestic ducks (Anas platyrhynchos domesticus) Abstract: The aim of this study was to evaluate the effects of domestication and the associated rearing system and rearing conditions on the carcass traits of ducks, assessed on the basis of weight and yield parameters, including skinless carcass weight, skinless breast muscle weight, skinless thigh weight, skinless thigh muscle weight, and the corresponding yield parameters. The study included 20 wild mallard ducks (Anas platyrhynchos) living under natural conditions and 20 domesticated Cherry Valley ducks (Anas platyrhynchos domesticus) reared under intensive indoor production conditions with controlled lighting, temperature, and feeding regimes. Wild duck group comprised females (DWF; n = 10) and males (DWM; n = 10), whereas Cherry Valley duck group comprised females (DDF; n = 10) and males (DDM; n = 10). Wild ducks were harvested during the hunting season in September. The age of the birds was determined according to standard hunting and ornithological criteria based on the evaluation of morphological characteristics, and all individuals were classified as one-year-old, whereas domesticated ducks were reared to 42 days of age. The results demonstrated that body weight, skinless carcass weight, skinless breast muscle weight, skinless thigh weight, and skinless thigh muscle weight were significantly higher (P ≤ 0.05) in Cherry Valley ducks. This pattern was confirmed in females, males, and in the analysis irrespective of sex. Among the evaluated yield parameters, Cherry Valley ducks exhibited significantly higher skinless thigh yield and skinless thigh muscle yield (P ≤ 0.05). In contrast, wild ducks showed significantly higher carcass yield and skinless breast muscle yield, both in females and males analysed separately and irrespective of sex (P ≤ 0.05). These findings confirm that domestication and intensive rearing have a significant influence on growth performance and carcass traits in ducks. Keywords: living conditions, meat production, waterfowl Journal: Czech Journal of Animal Science Pages: 371-379 Volume: 71 Issue: 8 Year: 2026 DOI: 10.17221/81/2026-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/81/2026-CJAS.html File-Format: text/html File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/81/2026-CJAS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202608-0004.txt Handle: RePEc:caa:jnlcjs:v:71:y:2026:i:8:id:81-2026-CJAS