A5012785046- Genetic and phenotypic traits in livestock
- Reproductive Physiology in Livestock
- Effects of Environmental Stressors on Livestock
- Genetic Mapping and Diversity in Plants and Animals
- Agriculture and Biological Studies
- Ruminant Nutrition and Digestive Physiology
- Milk Quality and Mastitis in Dairy Cows
University of Bologna
2023-2025
Twinning is undesirable in dairy cattle since it associated with higher risk of abortion, calving difficulty, and metabolic reproductive issues. Moreover, twin calves are lighter at birth generally have lower survival rate. As a result, twinning leads to significant economic losses for the farmer. In current study, genetic variance h2 rate (TR) were estimated as first step investigate feasibility reducing or least curb its increase Italian Holstein population through strategies. Calving...
Abstract Gestation length (GL) can potentially affect health and performance of both the dam newborn calf, it is controlled by two genetic components, direct maternal. This means that calf (direct effect) cow (maternal genotypes contribute to determine GL its variability. The aims present study were estimate maternal variance components GL, develop a routine evaluation in Italian Holstein evaluate potential (un)favourable associations with traits for which selection undertaken this...
The importance of milkability as a trait is growing because the need to efficiently use labor and machinery; therefore, it crucial update statistical model for improve accuracy estimated breeding values, thus provide more accurate tool decision-making at farm level. In Italian Holstein Friesian cattle population, recorded twice year by milk recording system binary (slow, coded 2, or not slow, 1). Data consisted 7,862,371 records from 2,945,249 cows collected between 2004 2021. A single-trait...
Age at first calving (AFC) represents the nonproductive period of ∼2 yr in Holstein cows, and thus, it has a relevant effect on cost rearing replacements dairy herd. In present study, we aimed to evaluate genetic genomic aspects AFC Italian population. Data 4,206,218 heifers with between 1996 2020 were used. averaged 26.09 ± 3.07 mo decreased across years. Heritability was estimated using linear animal model which included fixed effects herd-year-season birth classes gestation length, random...
Age at first calving (AFC) is around a 2-years non-productive period (on average in Holstein cows) which plays relevant role the cost of rearing replacements dairy herds. In present study we aimed evaluating heritability AFC and estimating breeding value trait Italian population. A linear animal model was used 0.03 (Posterior Standard Deviation 0.005). Further analyses will be performed to obtain genomic evaluation evaluate economic importance this trait.