Wales' chief veterinary officer says it is possible that some cattle were infected with the Schmallenberg virus (SBV) and therefore anticipates "calving problems later in the year as a consequence."
Dr Christianne Glossop says since the first clinical case of the disease in Wales in November last year there have been a further 11 positive cases of SBV in sheep.
Dr Glossop is encouraging farmers to be vigilant for signs of the disease and to seek swift veterinary assistance if they have any concerns.
More top news
The first planting of the Woodland Trust's WW1 Centenary Wood is set to get underway in the Gwendraeth Valley, near Kidwelly.
This week Hannah is in Carmarthenshire finding out what is happening at the National Botanic Garden of Wales, 15 years after it first opened
A study funded by The Brain Tumour Charity aims to discover how long it takes on average for adult brain tumour patients to be diagnosed.