Czech Journal of Animal Science, 2023 (vol. 68), issue 10
Polymorphism of the PGLYRP1 gene, the value of selected performance and functional traits, and causes of culling in Holstein-Friesian red-white cowsOriginal Paper
Piotr Sablik, Andrzej Dybus, Ewa Janu¶, B³a¿ej Nowak, Wojciech Kruszyñski, Anna Mucha
Czech J. Anim. Sci., 2023, 68(10):399-406 | DOI: 10.17221/194/2022-CJAS 
This research paper addresses the hypothesis that the peptidoglycan recognition protein 1 (PGLYRP1) gene polymorphism (Tyr76His; dbSNP ID: ss104796364) has an influence on some performance traits and causes of culling in Polish Holstein-Friesian red-white cows. The study involved 134 cows kept on a farm in the south-west of Poland. PGLYRP1 genotypes TT, CT, and CC were detected. It was shown that compared with cows with genotypes CT and TT, the individuals with genotype CC were characterised by higher lifetime yields and higher amounts of lactation milk, fat, and protein. A beneficial effect...
Effects of crossbreeding on milk production of sheepOriginal Paper
Michaela Èerná, Milan Margetín, Zdeòka Veselá, Michal Milerski
Czech J. Anim. Sci., 2023, 68(10):407-413 | DOI: 10.17221/39/2023-CJAS
The aim of this study was to estimate the effects of crossbreeding on milk production and milk components in crossbred Tsigai, Lacaune, and Improved Wallachian sheep used to create a synthetic Slovak dairy sheep population. The local breeds Tsigai and Improved Wallachian were crossed with the high-yielding breed Lacaune to increase milk yield. The effects of crossbreeding were evaluated based on breed and heterosis effects. The database used consisted of 23 018 lactations from 15 888 ewes. The effects of crossbreeding on milk production and fat and protein content were estimated using the restricted maximum likelihood method in REMLF90. Fixed effects...
Growth, carcass and meat quality in Zwartbles lambs slaughtered at different live weightsOriginal Paper
Tomá¹ Jano¹, Jan Kuchtík, Eli¹ka Draèková, Martin Ho¹ek, Tomá¹ Kopec, Radek Filipèík
Czech J. Anim. Sci., 2023, 68(10):414-422 | DOI: 10.17221/99/2023-CJAS
The aim of the study was to evaluate the effect of different live weights at slaughter (LWS) of Zwartbles lambs on their daily gain (DG), carcass traits (CT) and chemical and physical characteristics of the quadriceps femoris muscle (QFM). A total of four weight groups of lambs were evaluated: group A, LWS = up to 35 kg; group B, LWS from 35.1 to 40 kg; group C, LWS from 40.1 to 45 kg and group D, LWS from 45.1 to 50 kg. The LWS had a significant (P < 0.05) effect on DG and most CTs, when average DG and most weights of individual CTs increased with increasing LWS. The evaluation of the influence of LWS on the chemical and physical...
Genetic diversity and maternal origin of Vietnamese indigenous chicken breeds inferred from complete sequences of mitochondrial DNA D-loop regionOriginal Paper
Thi Thanh Nhan Giang, Van Ba Nguyen, Thi Quynh Chau Nguyen, Khanh Van Nguyen, Lan Doan Pham
Czech J. Anim. Sci., 2023, 68(10):423-432 | DOI: 10.17221/226/2022-CJAS
Indigenous chickens play a significant role in food security, income growth and socio-cultural life of rural households in Vietnam. This study was conducted to assess the genetic diversity as well as the phylogenetic relationships of Vietnamese indigenous chickens (Gallus gallus) to support the conservation of their genetic resources for sustainable rural farming. In this study, the genetic diversity and the phylogenetic relationships of 10 Vietnamese indigenous chicken breeds were analyzed using complete sequences of mitochondrial DNA (mtDNA) displacement-loop (D-loop) region. The average nucleotide and haplotype diversities of Vietnamese...