Browsing by Author "Dietrich, Alyssa"
Now showing 1 - 4 of 4
Results Per Page
Sort Options
- Dairy Pipeline. January/February 2014Dietrich, Alyssa; Callan, Peter L. (Virginia Cooperative Extension, 2014-01-07)Discusses nutrient requirements of calves during cold weather and the dangers of purchasing raw milk.
- Dairy Pipeline. March 2015James, Robert E.; Dietrich, Alyssa; Ferreira, Gonzalo (Virginia Cooperative Extension, 2015-03-02)This issue of Dairy Pipeline includes articles on protecting your calves' health with biosecurity protocols, should winter crops be considered cover crops in dairy farming systems, and a list of upcoming activities.
- Dairy Pipeline. November/December 2014James, Robert E.; Petersson-Wolfe, Christina S.; Dietrich, Alyssa (Virginia Cooperative Extension, 2014-11-04)Articles in this issue include, Milk Quality In The Southeast - How Did Virginia Measure Up In 2013?; Group Housing For Calves: Is This The Right System For You?; and Dairy Pipeline: Activities.
- Management, Sanitation, and Accuracy of Automated Calf FeedersDietrich, Alyssa (Virginia Tech, 2015-07-23)The objective was to summarize management practices, identify factors associated with bacterial counts, and describe the variation in total solids concentrations of milk or milk replacer in automated feeders. Six dairy calf operations in Virginia and 4 in Minnesota employing 1 to 2 sophisticated automated calf feeders were visited biweekly for 26 to 28 wk. An initial management survey was conducted for each farm. Observations on facilities, calf weights and heights, blood samples to estimate serum total proteins, treatment records, digital feeding behavior records, and milk or milk replacer (MMR) samples were collected at each visit. Additional milk replacer (MR) samples were collected for 4 wk pre- and post-circuit cleaning. Samples of MMR were plated on Aerobic Plate Count (APC) and Coliform Count (CCP) Petrifilms. Total solids concentration was estimated for MR samples by refractometry. Feeding plans varied widely between farms. Estimates of calf growth were near industry standards, but the proportion of calves receiving treatment was elevated. Least squares mean APC and CCP were 5.26 and 3.01 log10 cfu/ml for Virginia and 3.80 and 0.61 log10 cfu/ml for Minnesota. Circuit cleaning (CC) caused 13 and 16% log reduction in APC and CCP. However, more frequent CC/wk increased bacteria. Mixer/heat exchanger cleanings decreased bacteria during biweekly farm visits. Chlorine bleach reduced bacteria. Use of silicone feeder hoses increased bacteria. A quadratic effect of MMR liters delivered/d was observed; liters delivered > 147 L decreased APC. Automated feeders delivered 12.26% of MR samples > 2% over and 25.71% > 2% under target solids concentration.