Publications by authors named "A Zarnecki"
Precise genetic parameter estimates can allow the breeding value evaluation to be adjusted to meet European requirements and to enable participation in the international evaluation of Simmental bulls conducted by Interbull. Genetic parameters were estimated for a multitrait multilactation random regression test-day model for milk in Simmental cattle in Poland. Data came from the official Polish national recording system.
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- The study focuses on improving the health and fertility of Polish Holstein-Friesian cows by estimating genetic parameters for body condition score (BCS) and locomotion (LOC) based on data from over 317,000 cows across nearly 12,000 herds.
- Using a Bayesian method, researchers assessed how BCS and LOC relate to other traits such as milk production and fertility, finding that BCS has a moderate heritability and a favorable correlation with fertility traits, which could support better breeding goals.
- LOC was identified as a lowly heritable trait but showed significant genetic correlations with traits related to feet and legs, indicating that improving locomotion could also benefit overall cow conformation
The objective of this study was to estimate genetic parameters for the analyzed fertility traits of Polish Holstein-Friesian primiparous and multiparous cows, as a step toward the incorporation of new traits into routine genetic evaluation. Lactation records of 116,836 Polish Holstein-Friesian cows were studied. The records cover the first three lactations of all cows.
View Article and Find Full Text PDFThe goal of our study was to identify the SNPs, metabolic pathways (KEGG), and gene ontology (GO) terms significantly associated with calving and workability traits in dairy cattle. We analysed direct (DCE) and maternal (MCE) calving ease, direct (DSB) and maternal (MSB) stillbirth, milking speed (MSP), and temperament (TEM) based on a Holstein-Friesian dairy cattle population consisting of 35,203 individuals. The number of animals, depending on the trait, ranged from 22,301 bulls for TEM to 30,603 for DCE.
View Article and Find Full Text PDFLongevity is one of the functional traits that considerably affect dairy herd profitability. A Weibull proportional hazards model was used to evaluate the impact of difficult calvings and calf stillbirths on cow functional longevity, defined as length of productive life corrected for milk production. The data for analysis comprised calving ease and calf mortality scores of 2,163,426 calvings, 34.
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