Purdue University 1996 Swine Day Report

Research in progress


Effect of lactation dietary protein level on early weaned sow return to estrus. B.T. Richert, W.L. Singleton, and M.A. Diekman. Department of Animal Sciences.

Two lysine levels (1.2 or .8%) are being fed during lactation and sows are being weaned between 9 and 15 days into lactation. Sows are then being observed for return to estrus for 10 days, skip heated, and then bred. Subsequent litter size of the early weaned sows will be compared to contemporary conventionally weaned sows.

Effect of lactation length and dietary lysine level on sow follicular development, return to estrus, and pituitary and hypothalamic concentrations of LH and GnRH. B.T. Richert, M.A. Diekman, and W.L. Singleton. Department of Animal Sciences.

Parity one females from a high lean genetic line are being fed either a 1.2 or .8% lysine diet during lactation, and then either early or conventionally weaned. Sows are being slaughtered at 4, 6 or 8 days post-weaning to determine whether follicular development, uterine involution and cell regeneration, and hypothalamic and pituitary concentrations of LH and GnRH are affected by weaning age and lactation lysine level.

Effect of dietary fat inclusion levels on early-weaned nursery pig growth rates. B.T. Richert, J.W. Frank, K.G. Friesen, and A.P. Schinckel. Department of Animal Sciences and Tyson Foods.

Early-weaned stress carrier and stress negative pigs will be fed 3, 6, 9, or 12 % added poultry fat during the SEW, Phase 1 and Phase 2 portion of the growth life cycle.

Effect of genotype and lysine level on sow lactation performance. B.T. Richert and A. P. Schinckel. Department of Animal Sciences.

A high lean genotype and a conventional Yorkshire-Landrace genotype will be farrowed simultaneously and fed either a 1.2 or .8% lysine diet to estimate the difference in milk production potential and the effect of dietary lysine intake on litter weight gain, sow weight loss, feed intake, and backfat change for each genotype.

The lysine requirement for a high lean stress carrier crossbred pig. B.T. Richert, K.R. Cera, M. Karlsrude, D. Boyde, and A.P. Schinckel. Department of Animal Sciences, Countrymark Cooperative, Inc., and PIC, Inc.

Three lysine sequences are being fed to crossbred stress carrier pigs from 60 to 250 lb. Lysine levels are changed at 50, 100, 150, and 200 lb of live weight. Pigs are being serial scanned at weight changes to calculate growth curves under the various lysine sequences.

Effect of lactose and oat levels on SEW reared pig growth rate. B.T. Richert, K.R. Cera, and A.P. Schinckel. Department of Animal Sciences and Countrymark Cooperative, Inc.

Early weaned pigs are being fed one of six treatments during a 21 day growth experiment. For the first 14 days post-weaning, pigs are being fed either 17.5 or 35% oats and 20, 28, or 36% lactose. For the third week post-weaning, pigs are being fed 0 or 17.5 % oats and 12, 18 or 24% lactose.

Evaluation of interactions between health status environments, genetic potential for lean growth and growth promotants. B.T. Richert, L.K. Clark, A.L. Grant, M. McComb, and A.P. Schinckel. Departments of Animal Sciences and Veterinary Clinical Sciences.

Two genotypes - one high lean growth with low feed intake and one average lean growth with high feed intake - are being evaluated in two health environments (SEW and three site vs. 29-day weaning and continuous flow grow-finishing) with two levels of growth promotants (Mecadox-BMD vs. control). Growth rates, carcass composition, immune system responses and muscle growth parameters are being measured.

The influence of dietary fat quality on muscle and carcass fat quality. J.M. Eggert, E.J. Ferrand, S.M. Mills, A.P. Schinckel, A.L. Grant, J.C. Forrest, J.N. Nielsen, and B.A. Watkins. Departments of Animal Sciences and Food Sciences.

Gilts of two genetic lines will be fed five diets which differ in type and/or quality of supplemental fat, to determine the influence of dietary fat quality on muscle and carcass fat quality. The underlying biological differences of soft vs. firm fat and muscle are also being investigated.

Regulation of muscle development and meat quality. A.L. Grant, C.A. Bidwell, J.R. Blanton, F. Depreux, R.S. Everett, J.W. Leininger, L.G. McGinn, S. Jacobi, and D.E. Gerrard. Department of Animal Sciences.

Cellular and molecular mechanisms regulating muscle development and subsequent pork quality are being investigated. Myoblast-mediated gene transfer and intramuscular DNA injection are being used in pigs to determine influences of peptide hormones and growth factors on muscle development. Muscle-specific genes are being cloned so that elements conferring regulation can be identified and utilized for gene transfer and expression studies.

Use of antibiotics in all-in/all-out facilities. A.L. Ice, M.A. Diekman, A.L. Grant, T.R. Cline, and L.K. Clark. Departments of Animal Sciences and Veterinary Clinical Sciences.

Growth parameters are being measured in barrows reared in all-in/all-out facilities and conventional facilities, with or without the addition of chlorotetracycline (100 gm/ton).

The presence and prevalence of Salmonella, Campylobacter spp. and O-serotypes of E. coli in swine raised under differing management schemes. J.N. Nielsen, J.A. Patterson, A.P. Schinckel, and A.L. Sutton. Department of Animal Sciences.

In a previous experiment, comparing pigs raised in segregated early weaning (SEW) and continuous flow units, four pigs were positive for Salmonella prior to slaughter, and were not positive at every sampling; all four were from the SEW unit. No pathogens were detected on carcasses. A follow-up experiment is being conducted to determine if there is a higher incidence in SEW units, and the influence of antibiotics on the incidence of pathogens under different management schemes.

Reduction of sulfide odor compounds in pig manure through diet modification. A. Sutton, J. Patterson, O. Adeola, B. Richert, A. Heber, K. Kephart, R. Mumma, and E. Bogus. Departments of Animal Sciences and Agricultural and Biological Engineering, Purdue and Penn State.

Different dietary regimes are being tested with cannulated pigs to collect cecal, fresh manure and long term anaerobically stored manure samples for identification and changes in gases, odorous compounds, and microbial populations. This will also develop means to reduce odorous compounds, especially those containing sulfur, from swine manure.

Enhancing dietary phorphorus and nitrogen utilization in swine to reduce phorphorus and nitrogen excretion in manure. A. Sutton, O. Adeola, J. Patterson, and A. Schinckel. Department of Animal Sciences.

Two genetic lines of pigs will be fed diets utilizing phytase and synthetic amino acids to reduce nutrient outputs and determine effects on odorous compounds.

Phosphorus sorption characteristics in Indiana soils. B. Joern and A. Sutton. Departments of Agronomy and Animal Sciences.

Different swine manure loading rates will be continued on different Indiana soils to determine the maximum phosphorus loading and retention rates.

Management effects on air quality in confinement buildings. A. Heber, D. Jones, and A. Sutton. Departments of Agricultural and Biological Engineering and Animal Sciences.

Fields studies are being conducted at production units to determine the influence of altering management practices and using new air quality parameters. Air quality is being measured by a standardized mobile laboratory at each production operation.

Index of 1996 Purdue Swine Day Articles

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