Advancing genetic evaluation of milk yield and composition using a genomic-polygenic model in smallholder dairy cattle farms in Thailand

Impact of pedigree completeness on genomic–polygenic evaluations for milk yield, fat percentage, and age at first calving in Thai multibreed dairy cattle

Abstract Pedigree completeness is fundamental for accurate estimation of genetic parameters and reliable prediction of breeding values, yet incomplete pedigree records remain a persistent limitation in smallholder dairy systems, especially in multibreed populations. Although genomic data capture genetic relationships a...

Evaluation of Multi‐Breed Genomic Prediction Models for Carcass and Reproductive Traits in Zebu Beef Cattle

ABSTRACT Genomic prediction in beef cattle is particularly challenging in breeds with limited phenotypic and genotypic data. In this context, multi‐breed methodologies that integrate information from genetically related populations have emerged as a promising strategy to improve prediction accuracy and calibration unde...

Genome-wide association analysis reveals genetic architecture of fertility traits in Sahiwal heifers and cows

Genetic Parameters and Genome-Wide Association Analysis of Reproductive and Calving Traits in Jersey Cattle

This study characterized the genetic basis of reproductive and calving traits in Jersey cattle at different physiological stages and identified potential candidate genes. After quality control, 2716 records were available for heifer reproductive traits, 2707 for multiparous cow reproductive traits, and 5423 calving rec...

Genomic background of gestation length and calving-related traits in Holstein cattle.

The reproductive success of cows directly influences the profitability of dairy farms. Reproductive traits, particularly calving-related traits, generally have low heritability but sufficient additive genetic variance to enable genetic progress through genomic selection. Thus, the primary objectives of this study were...

Genetic and Environmental Sources of Variation for Lactation Milk Yield in Kilis Goats

The Kilis goat is one of the most important indigenous dairy goat breeds in Türkiye and plays a significant role in milk production systems of the southeastern region. Despite its economic importance, information regarding genetic parameters for milk production traits remains limited. Therefore, the present study aimed...