Publications by authors named "R Couto Serrenho"
Ketosis, evidenced by hyperketonemia with elevated blood β-hydroxybutyrate (BHB) levels, is a significant metabolic disorder of dairy cattle, typically diagnosed within the first 6 weeks post-calving when high energy levels are essential to milk production. Our study aimed to identify genetic markers linked to hyperketonemia (HYK) patterns in Holstein cows during early lactation and compare these to HYK-negative cows. We screened 964 cows for HYK using a threshold of BHB ≥1.
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- Metabolic acidosis (MA) is a frequently seen issue in horses suffering from colitis, but its impact on survival rates has not been clearly established.
- In a study of 158 horses with colitis, it was found that 60% had no MA, while 22% had lactic acidosis (LA), 12% had hyperchloremic acidosis (HA), and 6% had unmeasured strong ion acidosis (USI).
- The results showed that horses with LA faced a significantly higher risk of death (53% fatality rate) compared to those without MA (20% fatality), highlighting LA as a critical factor affecting survival in these cases
The objective of this study was to evaluate the effect of feeding a Saccharomyces cerevisiae fermentation product (SCFP) on milk production efficiency of Holstein cows naturally exposed to high temperature and humidity conditions. The study was conducted in 2 commercial farms in Mexico from July to October 2020 and included 1 wk covariate period, 3 wk adaptation, and 12 wk data collection. Cows [n = 1,843; ≥21 d in milk (DIM) and <100 d carried calf] were enrolled and assigned to the study pens (n = 10) balanced for parity, milk yield, and DIM.
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- The study looked at how management practices during the transition period (when cows are getting ready to give birth) affect high levels of ketones (hyperketolactia) in dairy cows and their milk production.
- The researchers used data from 71 dairy farms, mostly in Ontario, and looked at milk tests to see how many cows had problems with ketones.
- They found that about 27% of the cows had high ketone levels and used various models to understand the factors that influence this issue in herds.
Ketosis in dairy cattle is primarily diagnosed based on the concentrations of ketone bodies in the blood, milk, or urine. Cow-side tests using these fluids are available for rapid detection of elevated concentrations of ketone bodies. Although these tests have been extensively validated, the performance of different tests has not been compared over time.
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