The history of research into artificial insemination (AI) is over two centuries old and its
commercial application now spans 75 years. It is appropriate to reflect on the contribution of …

Reproductive efficiency in high yielding dairy cows has decreased over the past 50 years,
despite significant gains in genetic selection for increased milk output. One possible reason …

Genetic correlations between milk yield and reproductive measures in dairy cows are
unfavourable. This suggests that successful selection for higher yields may have led to a …

Accuracy of genomic selection depends on the accuracy of prediction of single nucleotide
polymorphism effects and the proportion of genetic variance explained by markers. Design …

The aim of this study was to investigate the relationship between measures of body
condition score collected from calving until wk 26 of lactation and reproductive measures …

Data were obtained from studies in Australia, Canada, and the United States using
individual cow data from 28,230 Holstein cows to evaluate associations between parity and …

The pathway for oxidation of energy involves a balanced oxidation of C2 and C3
compounds. During early lactation in dairy cattle this C2/C3 ratio is out of balance, due to a …

Lameness in dairy cows is a multifactorial and progressive disease with complex
interactions between risk factors contributing to its occurrence. Detailed records were …

This study provides estimates of genetic parameters for various diseases, fertility and 305-
day milk production traits in dairy cattle using data from a UK national milk recording …

In pasture-based dairy systems, supplementary feeds are used to increase dry matter intake
and milk production. Historically, supplementation involved the provision of the same …