Template-Type: ReDIF-Article 1.0 Author-Name: Tomáš Pěnka Author-Workplace-Name: University of South Bohemia, Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Vodnany, Czech Republic Author-Name: Oleksandr Malinovskyi Author-Workplace-Name: University of South Bohemia, Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Vodnany, Czech Republic Author-Name: Jitka Kolářová Author-Workplace-Name: University of South Bohemia, Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Vodnany, Czech Republic Author-Name: Václav Kučera Author-Workplace-Name: University of South Bohemia, Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Vodnany, Czech Republic Author-Name: Tomáš Policar Author-Workplace-Name: University of South Bohemia, Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Vodnany, Czech Republic Title: Influence of daily feed ration on growth and condition of juvenile pikeperch (Sander lucioperca) reared in a recirculating aquaculture system (RAS) Abstract: The study tested the effect of daily feed ration (DFR: 0.5%, 0.75%, 1.0%, 1.25%, and 1.5% of fish biomass) on juvenile pikeperch (Sander lucioperca) with an initial body weight of 21.5 ± 5.1 g and total length of 144.5 ± 8.5 mm. The pikeperch were fed floating feed at 8-hour intervals for a duration of 84 days. By the end of the experiment, the group fed DFR of 1.5% exhibited the highest body weight (51.5 ± 16.1 g) and total length (188.2 ± 17.8 mm). The weight heterogeneity, measured as the coefficient of variation (CV), ranged between 30.29 and 33.24%. The specific heterogeneity rate (SHR) ranged from 304.44 to 334.94‰/day. The group with DFR of 1.0% exhibited the highest degree of heterogeneity. Minor fin erosion was observed in the caudal fin by the end of the experiment. No significant differences were revealed in selected biochemical parameters indicating the liver, spleen, and intestinal function. All the fish tested were adequately fed, being provided sufficient nutrients for the proper growth of pikeperch. The DFR of 1.5% was evaluated as the most favourable. This amount of feed supported a higher number of values for Fulton's coefficient (FC), specific growth rate (SGR), thermal growth rate (TGR), fish weight heterogeneity, growth of total fish biomass (BG), and optimum level of biochemical parameters in blood plasma. Keywords: feed intake, fish condition, fish production, intensive aquaculture, percid culture Journal: Czech Journal of Animal Science Pages: 230-242 Volume: 69 Issue: 6 Year: 2024 DOI: 10.17221/33/2024-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/33/2024-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202406-0001.txt Handle: RePEc:caa:jnlcjs:v:69:y:2024:i:6:id:33-2024-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Václav Kučera Author-Workplace-Name: Faculty of Fisheries and Protection of the Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia, České Budějovice, Czech Republic Author-Name: Tomáš Pěnka Author-Workplace-Name: Faculty of Fisheries and Protection of the Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia, České Budějovice, Czech Republic Author-Name: Oleksandr Malinovskyi Author-Workplace-Name: Faculty of Fisheries and Protection of the Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia, České Budějovice, Czech Republic Author-Name: Carlos Yanes-Roca Author-Workplace-Name: Faculty of Fisheries and Protection of the Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia, České Budějovice, Czech Republic Author-Name: Zhaxygali B. Kuanchaleyev Author-Workplace-Name: Saken Seifullin Kazakh Agrotechnical Research University, Astana, Kazakhstan Author-Name: Tomáš Policar Author-Workplace-Name: Faculty of Fisheries and Protection of the Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia, České Budějovice, Czech Republic Title: Comparative study on the large-scale intensive culture of pikeperch (Sander lucioperca) larvae: Evaluation of two different live exogenous food options Abstract: This study is focused on the comparison of production efficiency (growth, survival, and development) and economic evaluation of large-scale larvae culture in pikeperch (Sander lucioperca) using Artemia (Group A) compared to using rotifers and the subsequent combination of rotifers and Artemia (Group R) as a first exogenous feed following weaning and intensive culture of juveniles. Both experimental groups were stocked with the same initial density (100 pcs per litre) of larvae at 4 days post hatching (DPH). Each group was cultured in triplicate until 65 DPH. Assessed parameters included FBW (final body weight), FTL (final total length), SGR (specific growth rate), SR (survival rate), CR (cannibalism rate), SBI (swim bladder inflation rate), and TDR (total deformity rate). Production costs were confronted with total number of all produced and high-quality juveniles to determine the cost per one juvenile. Juveniles in Group A displayed more rapid growth (significantly higher FBW, FTL and SGR). On the other hand, parameters concerning quality of the fish (SBI, SR, Share of high quality juveniles and TDR) were significantly higher in Group R. Statistical difference in CR also benefits Group R. Production of bigger share of high-quality juveniles in Group R decreased overall production cost per one high-quality juvenile by 59.7%, from 0.72 EUR in Group A to 0.29 EUR in Group R. Use of established feeding protocols confirmed significant production and economic improvements in pikeperch larvae culture and production of high-quality juveniles. Even though the price of rotifer cultivation significantly exceeded the price of Artemia purchase and cultivation, the production cost of high-quality pikeperch juveniles significantly decreased. Keywords: Artemia, economy, larvae, RAS, rotifers Journal: Czech Journal of Animal Science Pages: 243-254 Volume: 69 Issue: 6 Year: 2024 DOI: 10.17221/42/2024-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/42/2024-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202406-0002.txt Handle: RePEc:caa:jnlcjs:v:69:y:2024:i:6:id:42-2024-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Eunjeong Jeon Author-Workplace-Name: Department of Animal Science, Michigan State University, East Lansing, Michigan, USA Author-Name: Sangbuem Cho Author-Workplace-Name: Department of Animal Science, Jeonbuk National University, Jeonju, Republic of Korea Author-Name: Myungsun Park Author-Workplace-Name: Hanwoo Research Institute, National Institute of Animal Science, Pyeongchang, Republic of Korea Author-Name: Sung-Il Ahn Author-Workplace-Name: Department of Food Regulatory Science, Korea University, Sejong, Republic of Korea Author-Name: Junior Isaac Celestin Poaty Ditengou Author-Workplace-Name: Department of Animal Science, Jeonbuk National University, Jeonju, Republic of Korea Author-Name: Kim Ki-Beom Author-Workplace-Name: Korea Institute for Animal Products Quality Evaluation, Sejong, Republic of Korea Author-Name: Sung-Sub Shin Author-Workplace-Name: Korea Institute for Animal Products Quality Evaluation, Sejong, Republic of Korea Author-Name: Nag-Jin Choi Author-Workplace-Name: Department of Animal Science, Jeonbuk National University, Jeonju, Republic of Korea Title: Relationship between rib fat thickness and carcass price among different carcass weight groups in Korean native cattle Abstract: The study assessed the relationship between rib fat thickness and carcass price among different carcass weight groups in Korean native cattle (Hanwoo), taking into account changes in the beef grading system. Data from 8 926 Hanwoo steers, with an average age of 30.6 ± 1.88 months and slaughtered between 2017 and 2019, were analysed. The variables considered included rib fat thickness, carcass weight, eye muscle area, marbling score, and carcass price. Steers were categorised into eight carcass weight groups ranging from 250 kg to 650 kg in the original system, rib fat thickness consistently had a negative impact on carcass price, with partial coefficients of rib fat thickness on carcass price ranging from -1.96 to -46.5 depending on the carcass weight groups. Conversely, in the revised system, the impact of rib fat thickness varied from negative to positive, turning positive at the 450 kg carcass weight group. These findings may guide decision-making in beef cattle production and feeding strategies under the revised grading system. Keywords: carcass price, carcass trait, Hanwoo steers, partial regression Journal: Czech Journal of Animal Science Pages: 211-218 Volume: 69 Issue: 6 Year: 2024 DOI: 10.17221/57/2024-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/57/2024-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202406-0004.txt Handle: RePEc:caa:jnlcjs:v:69:y:2024:i:6:id:57-2024-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Tayfun Gündüz Author-Workplace-Name: Graduate School of Science, Kirşehir Ahi Evran University, Kirşehir, Türkiye Author-Name: Hayrettin Çayiroğlu Author-Workplace-Name: Department of Animal Science, Faculty of Agriculture, Kirşehir Ahi Evran University, Kirşehir, Türkiye. Title: Effects of maize silage withdrawal from finishing ration on weight gain, carcass yield and beef quality of Holstein Friesian × Belgian Blue crossbred bulls Abstract: This study was practical work in a commercial beef cattle enterprise to offer beef producers different options in a total mixed ration (TMR) design. This study was conducted to determine the effects of withdrawing maize silage from TMR during the finishing period on weight gain, carcass yield and beef quality of meat in beef cattle. Fifty-two Holstein Friesian x Belgian Blue crossbred bulls were used in this study for 126 days. These bulls were divided into four feeding methods described as (i) no maize silage in TMR (C1), (ii) maize silage was withdrawn from TMR two months before slaughter (S1), (iii) maize silage was withdrawn from TMR one month before slaughter (S2), and (iv) maize silage was included in TMR until slaughter (C2). Results showed that the fattening performance of experimental bulls was not affected by treatments, except some colour parameters of the muscle. Also, its chemical composition, pH, water holding capacity, drip loss, thawing loss, cooking loss, shear force, thiobarbituric acid reactive substances and radical scavenging activity were not affected by treatments. To conclude, the withdrawal of maize silage from TMR did not affect fattening performance and meat quality, suggesting that there is no need to withdraw maize silage from TMR during the finishing period of fattening in beef cattle. Keywords: carcass dressing, feeding, feed evaluation, longissimus lumborum muscle, meat quality Journal: Czech Journal of Animal Science Pages: 219-229 Volume: 69 Issue: 6 Year: 2024 DOI: 10.17221/40/2024-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/40/2024-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202406-0005.txt Handle: RePEc:caa:jnlcjs:v:69:y:2024:i:6:id:40-2024-CJAS