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Abstract
The postpartum period is a challenging time in the dairy cow’s life with production demands often overshadowing the need to resume cyclicity. The objective of this research was to evaluate variables with potential influence on time to resumption of cyclicity in postpartum dairy cattle. The first study focused on the influential variables of metabolites, milk production, visits to the robotic milking system, and anti-Müllerian hormone (AMH) on a robotic dairy and their implications for cyclicity resumption in Holstein cattle. The second study focused on the influential variables of milk production, AMH, and genomics on a conventional dairy and their implications for cyclicity resumption in Jersey cattle and how their fertility compares with Holstein cattle. This study additionally compared cyclicity between Jersey and Holstein cattle. The third study focused on the uterine microbiome in the postpartum period and its diversity, abundance, and differences between Holstein and Jersey cattle.