http://hdl.handle.net/2097/6598 2013-05-23T06:27:37Z 2013-05-23T06:27:37Z Smith, J.F. Harner, J.P. Brouk, M.J. http://hdl.handle.net/2097/6682 2010-11-29T18:03:24Z 2010-11-29T00:00:00Z

Ability of low profile cross-ventilated freestall barns to improve environmental conditions for dairy cattle Smith, J.F.; Harner, J.P.; Brouk, M.J. Recently, there has been interest in constructing mechanical ventilation with evaporative pads to improve the environmental conditions for cows during periods of heat stress. Low profile cross-ventilated freestalls with evaporative pads (LPCV) have become a popular system. The purpose of this study was to evaluate how well these LPCV systems improve the temperature-humidity index (THI) under different ambient conditions. As ambient humidity increases, ability of the LPCV to reduce THI is decreased. Producers wishing to construct LPCV barns should carefully evaluate the climate in which they want to construct LPCV structures. Dairy Research, 2007 is known as Dairy Day, 2007

2010-11-29T00:00:00Z Harner, J.P. Smith, J.F. Brouk, M.J. http://hdl.handle.net/2097/6681 2010-11-29T18:02:24Z 2010-11-29T00:00:00Z

Impact of separator efficiency and removed solids moisture content on make-up water requirements for sand recovery Harner, J.P.; Smith, J.F.; Brouk, M.J. Separator efficiency and moisture content of separated solids influence the make-up water requirements on a dairy seeking to utilize recycled water for sand reclamation. Additional water requirements range from 0 to 79 gallons/cow per day depending on the efficiency of the solid to liquid separation process. Make-up water includes any water stored in a containment structure, excluding urine. Final moisture content of the separated solids had marginal impact on the additional water requirements. Dairy Research, 2007 is known as Dairy Day, 2007

2010-11-29T00:00:00Z Harner, J.P. Smith, J.F. Brouk, M.J. http://hdl.handle.net/2097/6679 2010-11-29T18:01:45Z 2010-11-29T00:00:00Z

Impact of slope and pipe diameter on flush plume design Harner, J.P.; Smith, J.F.; Brouk, M.J. Manning’s equation provides a method to evaluate the flow characteristics of a flush plume system used to move a diluted, sandladen manure stream from a freestall building to sand or solid separation equipment. Evaluation of a 16, 18, and 24-inch plume showed pipe slope is critical in maintaining a 5 feet per second water velocity through the pipe. A 24 inch or larger plume placed on a 0.5% slope is able to obtain water velocity of 5 feet per second if the pump capacity exceeds 3,600 gpm. The flow velocity never reached or exceeded 5 feet per second in a 16- or 18-inch pipe placed on a 0.5% slope, regardless of the pump capacity. A 16-, 18- or 24-inch pipe laid on a 1% slope could obtain a water velocity of 5 feet per second if the pump capacity exceeded 1,500 gallons/minute. Dairy Research, 2007 is known as Dairy Day, 2007

2010-11-29T00:00:00Z Martel, C.A Buttery, B.S. Burns, M.G. Brown, W.E. Stevenson, J.S. http://hdl.handle.net/2097/6672 2010-11-29T17:56:10Z 2010-11-29T00:00:00Z

Times artifical insemination conception rates in response to a progesterone insert in lactating dairy cows Martel, C.A; Buttery, B.S.; Burns, M.G.; Brown, W.E.; Stevenson, J.S. Our objective was to determine the effectiveness of exogenous progesterone in the form of an intravaginal insert (controlled internal drug release, CIDR) in conjunction with an ovulation synchronization protocol in lactating dairy cows. Cows received a Presynch protocol (two injections of prostaglandin F2α [PGF2α] 14 days apart) beginning 30 and 36 days in milk, respectively, in two herds. Cows were inseminated after the second Presynch injection when estrus was detected. Remaining cows were treated with the Ovsynch protocol, and alternate cows were assigned randomly to receive a progesterone insert(CIDR). Blood was collected, and body condition scores (BCS) were assigned to treated cows. Pregnancy status was confirmed by palpation on day 38 post timed AI (TAI) and verified again 4 weeks later. Progesterone increased conception rates in treated cows when compared with controls (38 vs. 24%), but did not differ from early inseminated cows(38%). Pregnancy loss was numerically less in progesterone-treated cows than in controls(4.4 vs. 11.8%). Dairy Research, 2007 is known as Dairy Day, 2007

2010-11-29T00:00:00Z