Publications by authors named "J J Romero-Zuniga"
The reproductive efficiency and milk yield of cows are crucial factors in a dairy farm's profitability. However, abortions can have a negative impact on these factors. While the morbidity of abortion has been estimated in many countries, information on the burden on dairy cattle in tropical conditions is limited, and Costa Rica is a good example.
View Article and Find Full Text PDFArticle Synopsis
- Crossbred cattle, such as Gyr×Holstein and Brahman×Holstein, are being evaluated for lifetime productivity compared to purebred Holstein, Gyr, and Brahman in Costa Rica's tropical environments.
- Key productivity traits assessed include age at first calving, days open, milk production per lactation, lactation length, age at culling, and number of lactations, with heterosis estimates calculated for each trait.
- Findings show that while purebreds had some advantages in traits like milk production and lactation length, crossbreds exhibited favorable heterosis effects, particularly in age at first calving and days open, leading to higher overall lifetime productivity in crossbred cows.
We aim to identify the factors associated with the failure of amputation of one to three toes (index toe amputation) in patients with diabetes and foot infection. We conducted a retrospective cohort of 175 patients with diabetes who were hospitalized for moderate to severe foot infection and underwent amputation of one to three toes. A Poisson regression model was used to determine the prevalence ratio (PR) as a measure of association.
View Article and Find Full Text PDFDespite the economic importance of PRRS and its high prevalence in Costa Rica, there are no studies on the bioeconomic impact of the disease in the country or, even, in Central America. Such studies are essential in finding cost-effective preventive measures tailored for different production circumstances. Therefore, the objective of this study was to evaluate economic and production parameters of a PRRSV-infection for a medium-sized farrow-to-finish pig farm system in Costa Rica with a farm-level stochastic Monte Carlo simulation model.
View Article and Find Full Text PDFArticle Synopsis
- Bovine leukemia virus (BLV) is a significant infection causing enzootic bovine leukosis, primarily spread via infected blood from carrier cattle to healthy ones.
- A study conducted in Costa Rica from 2011 to 2018 found a 43.5% seropositivity rate in breeding bulls, with higher rates in Holstein and Jersey breeds, as well as older and dairy farm bulls compared to other groups.
- For the first time in Costa Rica, BLV DNA was detected in bull semen, highlighting the need for regular screening and awareness of risk factors linked to the disease.