Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 8 of 8

Full-Text Articles in Life Sciences

Performance Differences Between Two Groups Of Commercial Pigs Following Experimental Infection With Prrs Virus 1-7-4, Erin Little Jan 2019

Performance Differences Between Two Groups Of Commercial Pigs Following Experimental Infection With Prrs Virus 1-7-4, Erin Little

Electronic Theses and Dissertations

Porcine reproductive and respiratory syndrome virus (PRRSV) is the costliest swine disease in North America. Vaccines and management alone have not been effective in controlling this disease. Genetic selection for resilience may be a complimentary approach for controlling PRRSV. The objective of this study was to estimate performance differences between two groups of pigs from the same commercial line following infection with PRRSV 1-7-4: 1) pigs sired by boars selected based on a standard index (TN-S), which emphasized feed efficiency and carcass quality; and 2) pigs sired by boars selected based on an experimental index (TN-E), which emphasized feed intake ...


The Effect Of Delayed Onset Muscle Soreness On Jumping Mechanics And Performance, Ryan J. Engels Jan 2017

The Effect Of Delayed Onset Muscle Soreness On Jumping Mechanics And Performance, Ryan J. Engels

Electronic Theses and Dissertations

Background: Delayed onset muscle soreness (DOMS) is an exercise-induced muscle soreness resulting from high-intensity eccentric muscular contractions. DOMS appears to be more prevalent in athletes at the beginning of an athletic season or when new movements or exercise are first introduced. The acute effect of DOMS on jumping mechanics is currently unknown. PURPOSE: The purpose of this study is to determine the effect of delayed onset muscle soreness on vertical jump performance and jumping mechanics. METHODS: Twenty college aged, recreationally active males participated in this study (age: 21.54 ± 2.61; height: 1.82 ± 0.067; mass: 81.36 ± 9 ...


Effect Of Grazing Pressure On Cattle Grazing Cool Season Annual Forages, Brooke Brunsvig Jan 2017

Effect Of Grazing Pressure On Cattle Grazing Cool Season Annual Forages, Brooke Brunsvig

Electronic Theses and Dissertations

Ruminants can use plant fiber to produce food products that provide nourishment to humans. However, a precise understanding of specific plants selected by grazing ruminants remains elusive. Many long- and short-term factors impact cattle grazing behavior. Ultimately, grazing behavior can affect forage available for grazing, nutrient density of forage, dry matter intake, and animal performance. A myriad of grazing management strategies have been developed utilizing animal behavior to allow more efficient use of forage resources. Many management strategies based on manipulation of grazing behavior are simple and cost effective. Optimal performance of individual animals and amount of animal products produced ...


Effects Of Water Quality On Performance And Health Of Growing Steers, Hubert H. Patterson, Patricia S. Johnson, Doug B. Young, Ronald Haigh Jan 2003

Effects Of Water Quality On Performance And Health Of Growing Steers, Hubert H. Patterson, Patricia S. Johnson, Doug B. Young, Ronald Haigh

South Dakota Beef Report, 2003

Water available to livestock in western South Dakota is often high in total dissolved solids (TDS) and sulfates. Eighty-one crossbred, yearling steers (700 lb) were used to determine the effects of TDS and/or sulfates in water on cattle performance and health. Cattle were stratified by weight and randomly assigned to one of 12 pens (6-7 steers/pen). Pens were randomly assigned to one of four treatments (three pens/treatment) based on supplied water: 1) rural water (RW; 1,019 ppm TDS; 404 ppm sulfates, 2) well water (WW; 4,835 ppm TDS; 3,087 ppm sulfates), 3) dam water ...


Effect Of A Yeast Culture Product (Yea-Sacc) On Feedlot Performance Of Growing Calves Limit-Fed A High Concentrate Diet, C. P. Birkelo, B. Rops Jan 1994

Effect Of A Yeast Culture Product (Yea-Sacc) On Feedlot Performance Of Growing Calves Limit-Fed A High Concentrate Diet, C. P. Birkelo, B. Rops

South Dakota Beef Report, 1994

Eighty weaned steer calves (initial weight 535 Ib) were blocked by weight, allotted within block to 8 pens and limit-fed a high concentrate diet without (CONT) or with Yea-Sacc (YS; 13 g per day). The diet consisted of 69% whole, high moisture corn, 20% ground alfalfa hay, 2% molasses, and 9% supplement (dry matter basis). The diet was fed once daily for an average of 99 days in amounts calculated to result in CONT calf daily gain of 2.25 Ib. As intended, dry matter intakes of calves on the two treatments were identical (13.3 Ib/day). Daily gains ...


Evaluation Of Varying Levels Of Hereford, Simmental And Angus Breeding Cows, D.M. Marshall, C.A. Dinkel Jan 1987

Evaluation Of Varying Levels Of Hereford, Simmental And Angus Breeding Cows, D.M. Marshall, C.A. Dinkel

South Dakota Beef Report, 1987

Cow size, reproductive performance and calf performance to weaning were evaluated for Simmental-Hereford cows (25 to 38% Hereford) mated to Hereford bulls, Simmental-Hereford cows (50% Hereford) mated to Hereford bulls, Simmental-Hereford cows (62-7!5% Hereford) mated to Simmental bulls, Angus-Hereford cows (25.38% Hereford) mated to Hereford bulls, Angus-Hereford cows (50% Hereford) mated to Hereford bulls and Angus-Hereford cows (62-75% Hereford) mated to Angus bulls. Simmental cross cows were heavier and taller and produced heavier calves at b i r t h and weaning than Angus cross cows. Pregnancy rate, calf preweaning survival rate and calf birth date did not ...


Effectiveness Of Albendazole Against Parasites And Cow And Calf Performance, H.L. Miller, J. Berthelsen, B.A. Petitjean, R.H. Haigh Jan 1986

Effectiveness Of Albendazole Against Parasites And Cow And Calf Performance, H.L. Miller, J. Berthelsen, B.A. Petitjean, R.H. Haigh

South Dakota Beef Report, 1986

Albendazole was utilized in drench and feed additive form to determine its effectiveness against parasite control, cow weight and conception rate and calf weaning weights. Fecal oocyte number was decreased by administration of Albendazole. Calf weaning weights from treated cows were heavier the first two years (14.5 lb for heifers and 10.5 lb for bulls) but decreased the third year (13 lb and 6 lb for heifers and bulls, respectively). Conception rates were similar between the two groups, with the only difference occurring the third year when control cows had a higher conception rate from the second AI ...


Effects Of Preconditioning On Pre- And Postshipment Performance And Health Of Feeder Steers, J.K. Swann, R.H. Pritchard, M.A. Robbins Jan 1986

Effects Of Preconditioning On Pre- And Postshipment Performance And Health Of Feeder Steers, J.K. Swann, R.H. Pritchard, M.A. Robbins

South Dakota Beef Report, 1986

Four hundred steer calves were used to determine the effect of preconditioning on performance and health of calves fed either a high or low energy diet. In each of 2 years, 200 steer calves were selected from four western South Dakota ranches to participate in the study. Preconditioned (PC) calves were treated according to the South Dakota Beef Cattle Improvement Association and Cooperative Extension Service's guidelines for the "Green Tag" program. Preconditioning and implanting with zeranol produced a heavier calf at market time. No difference in weight loss during transit was noted between the PC and control treatments (CO ...