Publications by authors named "V N Gouvea"
Article Synopsis
- - The study explores how the mTOR pathway affects nutrient transport in the placenta, particularly focusing on the role of methionine as a dietary supplement for pregnant beef heifers and its impact on fetal growth and nutrient transfer.
- - Forty pregnant Angus heifers were divided into two groups, one receiving a standard diet and the other receiving additional methionine, with tissue samples analyzed at parturition to assess mTOR signaling and nutrient transporters.
- - Results showed that methionine supplementation led to increased plasma methionine and glutamate levels, with a significant interaction demonstrating that male calves from supplemented heifers had increased birth weights, while no effect was observed on female calves.
Dietary net energy for maintenance (NEm) and gain (NEg) can be estimated using calculations based on live performance or adjusted-final body weight, which is calculated based on carcass characteristics. These values are commonly referred to as performance-adjusted (pa) NEm (paNEm) and NEg (paNEg). The NEm and NEg of a diet can also be estimated by adding recovered energy (RE) with heat production (HP) derived from an automated head chamber system (AHCS), which we will term gas-adjusted (ga) NEm (gaNEm) and NEg (gaNEg).
View Article and Find Full Text PDFOur objective was to evaluate the effects of feeding 3-nitrooxypropanol (3-NOP; Bovaer, DSM Nutritional Products) at two levels on methane emissions, nitrogen balance, and performance by feedlot cattle. In experiment 1, a total of 138 Nellore bulls (initial body weight, 360 ± 37.3 kg) were housed in pens (27 pens with either 4 or 5 bulls per pen) and fed a high-concentrate diet for 96 d, containing 1) no addition of 3-NOP (control), 2) inclusion of 3-NOP at 100 mg/kg dry matter (DM), and 3) inclusion of 3-NOP at 150 mg/kg DM.
View Article and Find Full Text PDFThe objective of this study was to evaluate the effects of different combinations of monensin and narasin on finishing cattle. In Exp. 1, 40 rumen-cannulated Nellore steers [initial body weight (BW) = 231 ± 3.
View Article and Find Full Text PDFThis study compared the relative abundance of bacteria in the nasal cavity of high-risk beef heifers at feedlot arrival according to subsequent incidence of bovine respiratory disease (BRD). Angus-influenced heifers (n = 76) were transported for 1,100 km (11 h) to the feedlot (day -1). At feedlot arrival (day 0), heifers were weighed [shrunk body weight (BW) = 234 ± 15 kg] and a nasal cavity swab collected for microbiota analysis.
View Article and Find Full Text PDF