Template-Type: ReDIF-Article 1.0 Author-Name: Marina Pozovnikova Author-Name: Olga Tulinova Author-Workplace-Name: Russian Research Institute for Farm Animal Genetics and Breeding - Branch of the L. K. Ernst Federal Science Center for Animal Husbandry (RRIFAGB), St. Petersburg, Russian Federation Author-Name: Anna Krutikova Author-Workplace-Name: Russian Research Institute for Farm Animal Genetics and Breeding - Branch of the L. K. Ernst Federal Science Center for Animal Husbandry (RRIFAGB), St. Petersburg, Russian Federation Author-Name: Olga Mitrofanova Author-Workplace-Name: Russian Research Institute for Farm Animal Genetics and Breeding - Branch of the L. K. Ernst Federal Science Center for Animal Husbandry (RRIFAGB), St. Petersburg, Russian Federation Author-Name: Nataliy Dementieva Author-Workplace-Name: Russian Research Institute for Farm Animal Genetics and Breeding - Branch of the L. K. Ernst Federal Science Center for Animal Husbandry (RRIFAGB), St. Petersburg, Russian Federation Title: Monitoring and significance of the recessive genetic defect AH1 of Ayrshire cattle Abstract: Modern dairy farming is characterised by high selection intensity and the use of a limited number of bulls-producers. This increases the likelihood of widespread genetic defects in livestock populations. Genome-wide studies have identified DNA loci associated with the disruption of foetal embryonic development and its death, which have been called "fertility haplotypes". The aim of this study is to analyse the occurrence of АН1 haplotype or rs475678587 in Ayrshire bulls (n = 186) used in the artificial insemination system of Russia and to evaluate the reproductive and productive qualities of their daughters. The proportion of genetic defect carrier bulls in the analysed sample cohort was 16.66%. Analysis of the proportion of carriers of unwanted haplotype depending on the place of birth of the bull for service showed that the highest frequency was observed in bulls of Canadian origin (26.66%). Based on data on 97 478 cow and heifer calvings, stillbirth and abortion rates were analysed and cow reproduction rates were based on an AH1 status for the bull-father and bull for service. We observed a significant increase (P < 0.05 and P < 0.001) in the incidence of stillbirths when crossing the daughters of AH1-C bulls with AH1-C bulls. There was no negative association of abortion rates and reproductive qualities with AH1 haplotype. The high incidence of AH1 haplotype among animals of Ayrshire breed requires regular screening for the carriers of this haplotype not only among bulls, but also in cows. Keywords: abortion, Ayrshire breed, genetic defects, haplotype fertility, stillbirth Journal: Czech Journal of Animal Science Pages: 323-329 Volume: 65 Issue: 9 Year: 2020 DOI: 10.17221/110/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/110/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202009-0001.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:9:id:110-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Eva Tůmová Author-Workplace-Name: Department of Animal Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Robert Mervyn Gous Author-Workplace-Name: School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Scottsville, South Africa Author-Name: Darina Chodová Author-Workplace-Name: Department of Animal Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Mohamed Ketta Author-Workplace-Name: Department of Animal Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Differences in growth and carcass composition of growing male and female turkeys Abstract: An experiment was conducted with 1 680 one-day-old turkey poults (720 males and 960 females) of the Hybrid ConverterTM genotype to compare the growth performance of male and female turkeys. The experiment lasted until 119 days of age for males and 126 days for females, during which 6 commercial-type feeds were administered, with changes occurring at 21, 42, 63, 84 and 102 days of age. Performance was evaluated by weekly weighing and measuring feed consumption in each pen at weekly intervals. At 1, 7, 14, 21, 35, 56, 77, 119 (males) and 126 (female) days, 12 birds from each sex were sampled for weights of carcass, liver, gizzard, heart, thighs and breast. The Gompertz equation fitted separately to male and female growth data suggested that the mature weight of males would be by 16 kg heavier than in females (34.6 vs 18.7 kg) and that the females would mature 36% faster than males (0.023 2 vs 0.017 0/day). The weights of liver, gizzard and heart were similar in males and females in the early part of the growth period but they diverged from 35 days for the gizzard, 56 days for the liver and 77 days for the heart. However, the allometric coefficients describing the growth of each of these internal organs in relation to body weight were the same for males and females. Thigh weight was allometrically related to body weight, with males and females sharing the same relationship, but although the slope of the allometric relationship for breast weight in males and females was the same, breast weights in females were heavier than in males at any given body weight. Female turkeys became fatter than males from 56 days onwards. Keywords: sex, performance, carcass yield, allometry Journal: Czech Journal of Animal Science Pages: 330-336 Volume: 65 Issue: 9 Year: 2020 DOI: 10.17221/180/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/180/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202009-0002.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:9:id:180-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: David Zapletal Author-Name: Petra Jakešová Author-Workplace-Name: Department of Animal Breeding, Animal Nutrition and Biochemistry, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic Author-Name: Eliška Žáková Author-Workplace-Name: Department of Animal Breeding, Animal Nutrition and Biochemistry, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic Author-Name: Vlastimil Šimek Author-Workplace-Name: Department of Animal Breeding, Animal Nutrition and Biochemistry, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical 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 and Pharmaceutical Sciences Brno, Brno, Czech Republic Title: Growth performance, mortality and body and carcass characteristics of rabbit fatteners related to crossbreeding of Mecklenburger Schecke sires with dam line of HYLA rabbits Abstract: The aim of the study was to evaluate the effect of crossing Mecklenburger Schecke (MS) males with the maternal commercial line of HYLA rabbits on the growth performance, mortality and body and carcass components of fattened rabbits under intensive farming conditions. The control (C) group consisted of albino crossbred rabbits of the HYLA combination AB sires × CD dams. The tested (T) group (MS sires × HYLA CD dams) consisted of rabbit crosses between the MS sires and the same dam line as in the C group. Rabbits of both groups were raised and fattened under identical nutritional and management conditions. The crossing of MS males with the maternal line of HYLA rabbits led to the acceptable growth performance of rabbits in the T group. The higher slaughter weight of rabbits in the T group as compared to rabbits in the C group (P < 0.01) as associated with the higher weight of hot carcass and higher proportions of fore and intermediate parts of carcass (P < 0.01). On the contrary, HYLA rabbits had a higher proportion of the hind part of carcass (P < 0.001); yields of hind leg meat and musculus longissimus thoracis et lumborum were not influenced by the genotype. However, since higher mortality was found in rabbits of the T group during fattening, it is not possible to recommend the MS breed as a common sire line used under conditions of intensive farming at this moment. Regarding the rabbit sex, slaughtered females showed a higher proportion of liver and a lower dressing percentage associated with the worse carcass compactness compared to males. Keywords: crossbred rabbit, sire breed, commercial dam line, prolonged fattening, sex, meat production Journal: Czech Journal of Animal Science Pages: 337-345 Volume: 65 Issue: 9 Year: 2020 DOI: 10.17221/192/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/192/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202009-0003.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:9:id:192-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Ľubomír Ondruška Author-Workplace-Name: National Agricultural and Food Centre, Research Institute for Animal Production Nitra, Luzianky, Slovak Republic Author-Name: Vladimír Parkányi Author-Workplace-Name: National Agricultural and Food Centre, Research Institute for Animal Production Nitra, Luzianky, Slovak Republic Author-Name: Ján Rafay Author-Workplace-Name: National Agricultural and Food Centre, Research Institute for Animal Production Nitra, Luzianky, Slovak Republic Author-Workplace-Name: Faculty of Natural Sciences, University of Ss. Cyril and Methodius in Trnava, Trnava, Slovak Republic Author-Name: Alica Navrátilová Author-Workplace-Name: Department of Animal Genetics and Breeding Biology, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Polymorphism and association of progesterone receptor gene with milk production and reproductive traits of rabbits Abstract: Using the PCR RFLP method polymorphism and three different genotypes (AA, AG and GG) were detected in the progesterone receptor gene (PGR) promoter in a local Slovak crossbred rabbit line. We have noted a slightly majority frequency of allele A (0.53) over allele G (0.47). Comparing the observed and expected genotype frequencies with the χ2 test the results were statistically significant, which means the tested rabbit population was non-equilibrium. The best results and significantly highest milk production (P < 0.001) were recorded in the does of GG genotype compared to AA genotype. Other association studies aimed at the effect of genotypes on litter size showed the highest litter size and number of weaned rabbits per litter in GG genotype. A significantly higher (P < 0.05) average number of stillborn kits per litter was in the group of does with AA genotype (0.62) compared with GG genotype (0.34). Keywords: PGR, milk yield, genotype, rabbit Journal: Czech Journal of Animal Science Pages: 346-353 Volume: 65 Issue: 9 Year: 2020 DOI: 10.17221/156/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/156/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202009-0004.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:9:id:156-2020-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: Antonella Dalle Zotte Author-Workplace-Name: Department of Animal Medicine, Production and Health, University of Padova, Padova, Italy Author-Name: Anna Concollato Author-Workplace-Name: Department of Animal Medicine, Production and Health, University of Padova, Padova, Italy Author-Workplace-Name: §Department of Agri-Food Production and Environmental Sciences, Section of Animal Sciences, University of Florence, Florence, Italy Present address: Facco & C. Officine (S.P.A.), Padova, Italy Author-Name: Giulia Secci Author-Workplace-Name: §Department of Agri-Food Production and Environmental Sciences, Section of Animal Sciences, University of Florence, Florence, Italy Present address: Facco & C. Officine (S.P.A.), Padova, Italy Author-Name: Marco Cullere Author-Workplace-Name: Department of Animal Medicine, Production and Health, University of Padova, Padova, Italy Author-Name: Giuliana Parisi Author-Workplace-Name: §Department of Agri-Food Production and Environmental Sciences, Section of Animal Sciences, University of Florence, Florence, Italy Present address: Facco & C. Officine (S.P.A.), Padova, Italy Title: Rainbow trout (Oncorhynchus mykiss) farmed at two different temperatures: Post rigor mortis changes in function of the stunning method Abstract: Post rigor mortis changes of texture, chemical and sensory properties in rainbow trout (Oncorhynchus mykiss) reared at two different temperature conditions (8 and 12 °C) were examined to better understand how different stunning methods, i.e. electroshock (E) and asphyxia with carbon monoxide (CO), can influence their evolution during refrigerated storage. Seven days after rigor resolution (TRR7), considering ATP catabolites (K- and K1-values), the freshness remained well preserved regardless of the stunning method applied and water temperature. During refrigerated storage fillets from fish reared at 8 °C maintained significantly higher (P < 0.001) pH at the day of rigor resolution (TRR0), whereas at the end of the storage time (TRR7), 8 °C-reared fish showed a significantly lower pH value (P < 0.05). CO treatment was effective in ensuring a more intense red colour of the fillet and high chroma, whereas E treatment exhibited the lowest a*, b* and chroma values. The texture profile analysis showed a significant effect of the stunning method (S), water temperature (T) and S × T interaction on fillet cohesiveness. TBARS values were significantly lower (P < 0.05) in fish stunned by CO when compared to E group in the first 76 h post mortem (TRR0). At the end of the storage period (TRR7), no TBARS value difference was detected between treatments. The stunning method had a relevant impact on fillet sensory traits, revealing that CO fillets were the juiciest (P < 0.05) and presented the lowest saltiness (P < 0.05), aroma (P < 0.05) and odour (P < 0.01) intensity. Rearing temperature, instead, had a moderate effect on fillet sensory traits and indicated that the water temperature of 12 °C enhanced juiciness (P < 0.05) and tenderness (P < 0.05) attributes. Overall results suggested that CO is a suitable stunning method for trout that, coupled with 12 °C water temperature, are able to preserve fillet freshness, enhance colorimetric characteristics which are maintained during refrigerated storage, and provide desirable sensory traits. Keywords: electricity, carbon monoxide, animal welfare, product quality, lipid oxidation, sensory analysis, fish Journal: Czech Journal of Animal Science Pages: 354-364 Volume: 65 Issue: 9 Year: 2020 DOI: 10.17221/144/2020-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/144/2020-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-202009-0005.txt Handle: RePEc:caa:jnlcjs:v:65:y:2020:i:9:id:144-2020-CJAS