Czech Journal of Animal Science, 2021 (vol. 66), issue 7
Health traits in current dairy cattle breeding: A reviewReview
Ludmila Zavadilová, Eva Kašná, Zuzana Krupová, Anita Klímová
Czech J. Anim. Sci., 2021, 66(7):235-250 | DOI: 10.17221/163/2020-CJAS 
The review focuses on breeding practices aimed at improving resistance to diseases and health disorders that are associated with better efficiency, welfare and longevity of cows. It is commonly known that diseases like mastitis, foot and claw disorders, metabolic and reproductive issues seriously violate dairy cows' well-being. The cause of prevailing health and fertility deterioration has been the intensive selection merely based on higher milk production starting after the Second World War. Therefore since the last decades of the 20th-century genetic selection programs have been increasingly focused on increasing resistance to diseases and improving...
The evaluation of genomic diversity and selection signals in the autochthonous Slovak Spotted cattleOriginal Paper
Radovan Kasarda, Nina Moravčíková, Barbora Olšanská, Gábor Mészáros, Luboš Vostrý, Hana Vostrá-Vydrová, Kristína Lehocká, Ján Prišťák, Juraj Candrák
Czech J. Anim. Sci., 2021, 66(7):251-261 | DOI: 10.17221/265/2020-CJAS
The aim of this study was to evaluate the effective population size based on linkage disequilibrium and the trend of inbreeding derived from runs of homozygosity (ROH) in the Slovak Spotted cattle. The ROH segments longer than 4 Mb were then analysed to identify selection signals. Eighty-five individuals were genotyped using the ICBF International Dairy and Beef chip (dams of sires) and Illumina BovineSNP50 BeadChip (sires). The ROH segments > 1 Mb occurred most often in the autosomal genome with an average number of 16.75 ± 7.23. The ROH segments > 16 Mb covering 0.41% of the genome pointed to the long-term effort of breeders to reduce...
Relationship between direct and maternal genetic effects on weaning weight of Limousin and crossbred beef calvesOriginal Paper
Ferenc Szabó, Judit Márton, Eszter Szabó, Márton Szűcs, Szabolcs Bene
Czech J. Anim. Sci., 2021, 66(7):262-270 | DOI: 10.17221/298/2020-CJAS
Population genetic parameters, direct and maternal breeding value, the genetic trend in the weaning weight of Limousin beef cattle calves were estimated in the period 1992-2019. Data of 19 764 calves (15 437 purebred Limousin and 4 327 crossbred) were computed. Crossbred calves were sired by Limousin breeding bulls from Simmental dams. Calves in question came from 37 herds and from 240 sires in Hungary. DFREML and MTDFREML software was used for the estimation of population genetic parameters, BLUP animal model for breeding value estimation. Weighted linear regression model was used for describing genetic trends. The maternal heritability (h2m...
Analysis of the relationship between caecal flora difference and production performance of two rabbit species by high-throughput sequencingOriginal Paper
Zhiqiang Guo, Bin Wang, Jingzhi Lu, Congyan Li, Liangde Kuang, Xiaoxia Tang, Xiuli Mei, Xiaohong Xie
Czech J. Anim. Sci., 2021, 66(7):271-280 | DOI: 10.17221/225/2020-CJAS
The purpose of this experiment is to study the relationship between the difference in production performance between Sichuan White (SC) rabbits and New Zealand (NZL) rabbits and the diversity of caecal flora. Twelve pregnant SC rabbits and 12 NZL female rabbits were selected for this experiment. After delivery, the young rabbits were divided into two groups according to breeds, each group had 30 replicates, and each replicate had one rabbit. During the experiments, these rabbits were kept in the same room, and the temperature in the room was controlled at 12-25 °C, with a 16-hour light cycle every 24 hours. The nutritional composition of the feed and...
Effects of dietary energy level and guanidino acetic acid supplementation on growth performance, carcass quality and intestinal architecture of broilersOriginal Paper
Necmettin Ceylan, Sait Koca, Shahram Golzar Adabi, Nejla Kahraman, Muhammad Nasir Bhaya, Mehmet Fatih Bozkurt
Czech J. Anim. Sci., 2021, 66(7):281-291 | DOI: 10.17221/11/2021-CJAS
Energy, known as the most expensive nutrient in broiler feed, is what strongly adjusts and affects the growth of broilers. Creatine has a key role in cellular energy metabolism and could be synthesised from guanidinoacetic acid (GAA) in the liver; however, its de novo synthesis is not able to adequately fulfil the demand of energy metabolism, especially in fast-growing modern broilers. So the aim of the study was to evaluate the efficiency of commercial GAA in energy-reduced broiler diets on performance and intestinal development. Overall, 11 400 day-old Ross 308 chicks were randomly allocated to six dietary treatments with ten replicates...