Life Sciences Commons^™

Selection Practices And Genetic And Phenotypic Trends Estimated From Nebraska Spf Swine Field Records, P. J. David, R. K. Johnson, T. E. Socha

Department of Animal Science: Faculty Publications

Records collected during 1971 through 1979 from 101,606 pigs raised in 18 herds that were members of the Nebraska SPF Swine Accrediting Association were evaluated for phenotypic trends and predicted and observed genetic trends. Traits considered were backfat at 100 kg (BF) and weight at 140 d of age (WT). Phenotypic change on average was beneficial for BF (-.05 mm/yr) but undesirable for WT (-.2 kg/yr). However, the average observed genetic trend was nil for BF and .6 kg/yr for WT. An average, predicted response based on observed selection differentials and estimates of within herd-sex genetic parameters was in good …

Reduced Nocturnal Temperatures For Early Weaned Pigs, M. C. Brumm, D. P. Shelton, R. K. Johnson

Department of Animal Science: Faculty Publications

Three experiments of 5 wk duration were conducted to evaluate the effect of reduced nocturnal temperatures (RNT) on weaned pig performance. Treatments were 1) a control regimen (CR) of 30 C constant air temperature lowered 2 C/wk and 2) a regimen where the temperature from 1900 to 0700 h was lowered to 25 C for three nights followed by 20 C for four nights during the first week and then lowered 1 C/wk thereafter (RNT). Weaned pigs averaging 23 ± 2 d of age at the start of the experiments gained faster (P<.01) in the RNT treatment vs the CR treatment in Exp. 1, 2 and 3, respectively (.32 vs .28; .39 vs .37; .35 vs .34 kg/d). The improvement in gain was accompanied by an increase (P<.005) in feed intake for the same period (.48 vs .44; .61 vs .55;.58 vs .54 kg/d). There was no difference in feed conversion. Weaned pigs that were 1.9 to 2.3 kg lighter initially gained slower (P<.0005) compared with their heavier contemporaries (.27 vs .33; .33 vs .43 and .31 vs .33 kg/d) in Exp. 1, 2 and 3, respectively, This reduced gain was accompanied by a reduced (P<.0005) feed intake (.40 vs .51; .50 vs .66; .50 vs .62 kg/d). There was no interaction of initial weight and temperature regimen.

Effect Of Dietary Fat On Pig Performance And Dust Levels In Modified-Open-Front And Environmentally Regulated Confinement Buildings, L. I. Chiba, E. R. Peo, Jr., A. J. Lewis, M. C. Brumm, R. D. Fritschen, J. D. Crenshaw

Department of Animal Science: Faculty Publications

Four trials were conducted with 1,480 pigs (initial wt: 23 kg in trial 1, 29 kg in trial 2 and 49 kg in trial 3 and 4) to determine the effect of dietary fat on pig performance, nutrient separation in an automated feed distribution system, dust levels in swine buildings and integrity of the respiratory system of swine. Two modified-open-front (B-1 and B-2) and two environmentally regulated (E-1 and E-2) growing-finishing buildings, of identical design, were used in each trial. In trial 1,250 pigs (25 pens of 10 pigs/pen) in B-1 were fed a ground, mixed, corn-soybean meal diet (15% …

Weaining Weight Response Of Pigs To Simple And Complex Diets, L. V. Himmelberg, E. R. Peo, Jr., A. J. Lewis, J. D. Crenshaw

Department of Animal Science: Faculty Publications

Five experiments were conducted to determine (1) the value of simple vs complex diets on gains and feed conversion of pigs weaned at a constant age but varying in weight, (2) the optimum post-weaning time to change from a complex to a simple diet and (3) the effect of previous treatment on subsequent performance.

Effect On Receiving Diets Containing Alfalfa And Certain Feed Additives On Performance Of Feeder Pigs Transported Long Distances, M. C. Brumm, E. R. Peo, Jr.

Department of Animal Science: Faculty Publications

Three experiments were conducted to determine the effect of receiving diets containing alfalfa meal and certain feed additives on performance of comingled feeder pigs transported 900 to 1,100 kin. In Exp. 1, the inclusion of 9.4% dehydrated alfalfa meal in receiving diets for 2 wk resulted in no difference (P>.I) in gain or feed conversion from purchase to market compared with pigs fed a basal corn-soybean meal (CS) diet or a diet containing 20% ground whole oats (O). In Exp. 2, pigs fed receiving diets containing 10% dehydrated alfalfa meal had no improvement (P>. 1) in gain (.60 …

G85-748 Prevention And Control Of Swine Dysentery, Gerald E. Duhamel, Alex Hogg, Barbara E. Straw

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide describes the causes and symptoms of swine dysentery and offers management recommendations and treatment procedures for its prevention and control.

Swine dysentery is a highly contagious disease of growing and finishing pigs. First described in Indiana in 1921, it has been called black scours, bloody scours, and vibrionic dysentery.

Swine dysentery causes important financial losses because of reduced feed efficiency and lower weight gain, costs of medication and additional animal care, and death. Substantial costs may result from loss of sales of breeding stock, or depopulation when necessary. Serpula (Treponema) hyodysenteriae, a spiral bacterium, is the cause …

G85-747 Enteric Diseases (Scours) Of Swine, Alex Hogg, Alfonso Torres

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide describes four major enteric diseases of swine, and discusses the cause, clinical signs, differential diagnosis, treatment, and control of each.

Four of the most important infectious enteric diseases of swine are reviewed in this publication. These include colibacillosis, transmissible gastroenteritis (TGE), rotavirus, and enterotoxemia (clostridial enteritis). A fifth disease, swine dysentery, is discussed in NebGuide G85-748.