@article{faust_robison_tess_1993, title={GENETIC AND ECONOMIC-ANALYSES OF SOW REPLACEMENT RATES IN THE COMMERCIAL TIER OF A HIERARCHICAL SWINE BREEDING STRUCTURE}, volume={71}, ISSN={["0021-8812"]}, DOI={10.2527/1993.7161400x}, abstractNote={Commercial-level sow replacement rates were investigated for a 10-yr planning horizon using a stochastic life-cycle swine production model. A three-tiered breeding structure was modeled for the production of market hogs in a three-breed static crossing scheme. Growth and reproductive traits of individual pigs were simulated using genetic, environmental, and economic parameters. Culling was after a maximum of 1, 5, or 10 parities in commercial levels within 1- and 5-parity nucleus and 1-, 5-, and 10-parity multiplier combinations. Yearly changes and average phenotypic levels were computed for pig and sow performance and economic measures. For growth traits, greater commercial level response was for systems with higher sow replacement rates, 110 to 115% of lowest response. Phenotypic changes in net returns ranged from $.85 to 1.01 x pig-1 x yr-1. Average growth performances were highest for systems with greatest genetic trend. Highest kilograms.sow-1 x year-1 finished was for 10-parity commercial alternatives. System differences in total costs and returns per pig resulted primarily from differences in replacement costs. Removal of the gilt system from analyses often reduced ranges among systems for economic measures by more than 70%. Systems with the lowest commercial replacement rates were most profitable. Within these systems, those with higher genetic change had highest net returns. For high replacement rates, no more than 175% of market value could be paid for gilts, but with lower sow replacement rates commercial units could justify as much as 450%.}, number={6}, journal={JOURNAL OF ANIMAL SCIENCE}, author={FAUST, MA and ROBISON, OW and TESS, MW}, year={1993}, month={Jun}, pages={1400–1406} }
 @article{faust_robison_tess_1993, title={INTEGRATED SYSTEMS-ANALYSIS OF SOW REPLACEMENT RATES IN A HIERARCHICAL SWINE BREEDING STRUCTURE}, volume={71}, ISSN={["0021-8812"]}, DOI={10.2527/1993.71112885x}, abstractNote={Sow replacement rates in a three-tiered breeding structure were investigated for a 10-yr planning horizon using a stochastic life-cycle swine production model. Market hogs were produced in a three-breed static crossing program and marketed on a liveweight basis. Growth and reproductive traits of individual pigs were simulated using genetic, environmental, and economic parameters. Sows were culled after a maximum of 1, 5, or 10 parities. Systems were defined by maximum sow age at culling and included combinations of 1- and 5-parity nucleus and 1-, 5-, and 10-parity multiplier and commercial tiers. Economic response to index selection was considerable for all culling alternatives with yearly increases in system profits ranging from $1.06 to 1.44 for each commercial hog marketed. When sows were culled after one parity in nucleus, multiplier, and commercial tiers, respectively (1,1,1), annual changes in net returns and all cost measures were 40 to 50% larger than responses in systems with lower sow replacement rates. Based on 10-yr averages for net returns, systems with low multiplier- and commercial-level replacement rates were more profitable than systems with higher replacement rates. The most profitable system (5,10,10) differed from the least profitable system (1,1,1) by more than $10 per pig, but when the (1,1,1) system was excluded, the range was only $3 per pig. The system with lowest replacement rates supported 3,388 more multiplier and 34,151 more commercial sows from a 750-sow nucleus level than the (1,1,1) system. Output from the two extremes differed by > 664,000 commercial market hogs sold.(ABSTRACT TRUNCATED AT 250 WORDS)}, number={11}, journal={JOURNAL OF ANIMAL SCIENCE}, author={FAUST, MA and ROBISON, OW and TESS, MW}, year={1993}, month={Nov}, pages={2885–2890} }
 @article{faust_tess_robison_1992, title={A BIOECONOMIC SIMULATION-MODEL FOR A HIERARCHICAL SWINE BREEDING STRUCTURE}, volume={70}, ISSN={["0021-8812"]}, DOI={10.2527/1992.7061760x}, abstractNote={A stochastic computer model was developed to simulate individual pigs in a hierarchical breeding system. The bioeconomic model was designed as a tool to facilitate the evaluation of selection, culling, and management strategies for a three-tiered breeding structure. Events such as mating, farrowing, and selection occurred weekly. Variables included number of pigs born alive, survival rate from birth to weaning, average daily gain and backfat at 110 kg, number of pigs weaned, feed per gain, days from weaning to 110 kg, age at puberty, and growth rate and weight of sows and service boars. Also included were probabilities of conception, return to estrus by week, survival, involuntary culling, male infertility, and unacceptable conformation. Variables important for selection were determined by breeding value, individual and maternal heterosis, parity, size of birth litter, sex, age of dam, genetic and environmental relationships between variables, and common litter, permanent, and random environmental effects. Variables derived from selection variables were computed by regression using phenotypic relationships between all variables. Also, a random environmental effect was added to predicted performance. Means and variances of variables differed between genetic lines. Production costs included feed, non-feed operating, fixed, and replacement stock costs. Income included market animals, culls, and replacements sold to lower tiers. Effects of changes in backfat on market value and sow maintenance feed costs were not modeled. An example is given to illustrate model output.}, number={6}, journal={JOURNAL OF ANIMAL SCIENCE}, author={FAUST, MA and TESS, MW and ROBISON, OW}, year={1992}, month={Jun}, pages={1760–1774} }
 @article{faust_robison_tess_1992, title={GENETIC AND ECONOMIC-ANALYSES OF FEMALE REPLACEMENT RATES IN THE DAM-DAUGHTER PATHWAY OF A HIERARCHICAL SWINE BREEDING STRUCTURE}, volume={70}, ISSN={["0021-8812"]}, DOI={10.2527/1992.7072053x}, abstractNote={A stochastic life-cycle swine production model was used to study the effect of female replacement rates in the dam-daughter pathway for a tiered breeding structure on genetic change and returns to the breeder. Genetic, environmental, and economic parameters were used to simulate characteristics of individual pigs in a system producing F1 female replacements. Evaluated were maximum culling ages for nucleus and multiplier tier sows. System combinations included one- and five-parity alternatives for both levels and 10-parity options for the multiplier tier. Yearly changes and average phenotypic levels were computed for performance and economic measures. Generally, at the nucleus level, responses to 10 yr of selection for sow and pig performance in five-parity herds were 70 to 85% of response in one-parity herds. Similarly, the highest selection responses in multiplier herds were from systems with one-parity nucleus tiers. Responses in these were typically greater than 115% of the response for systems with the smallest yearly change, namely, the five-parity nucleus and five- and 10-parity multiplier levels. In contrast, the most profitable multiplier tiers (10-parity) had the lowest replacement costs. Within a multiplier culling strategy, rapid genetic change was desirable. Differences between systems that culled after five or 10 parities were smaller than differences between five- and one-parity multiplier options. To recover production costs, systems with the lowest returns required 140% of market hog value for gilts available to commercial tiers, whereas more economically efficient systems required no premium.}, number={7}, journal={JOURNAL OF ANIMAL SCIENCE}, author={FAUST, MA and ROBISON, OW and TESS, MW}, year={1992}, month={Jul}, pages={2053–2064} }
 @article{faust_robison_mcdaniel_1990, title={ANIMAL-MODEL ESTIMATES OF CYTOPLASMIC LINE CONSTANTS FOR YIELD IN HOLSTEINS}, volume={107}, ISSN={["0931-2668"]}, DOI={10.1111/j.1439-0388.1990.tb00051.x}, abstractNote={Journal of Animal Breeding and GeneticsVolume 107, Issue 1-6 p. 401-410 Animal model estimates of cytoplasmic line constants for yield in Holsteins1 M. A. Faust, M. A. Faust Department of Animal Science, North Carolina State University, Raleigh, USASearch for more papers by this authorDr. O. W. Robison, Corresponding Author Dr. O. W. Robison Department of Animal Science, North Carolina State University, Raleigh, USAAnimal Science Department. P.O. Box 7621, N.C. State University, Raleigh, NC 27695-7621, USASearch for more papers by this authorB. T. McDaniel, B. T. McDaniel Department of Animal Science, North Carolina State University, Raleigh, USASearch for more papers by this author M. A. Faust, M. A. Faust Department of Animal Science, North Carolina State University, Raleigh, USASearch for more papers by this authorDr. O. W. Robison, Corresponding Author Dr. O. W. Robison Department of Animal Science, North Carolina State University, Raleigh, USAAnimal Science Department. P.O. Box 7621, N.C. State University, Raleigh, NC 27695-7621, USASearch for more papers by this authorB. T. McDaniel, B. T. McDaniel Department of Animal Science, North Carolina State University, Raleigh, USASearch for more papers by this author First published: January‐December 1990 https://doi.org/10.1111/j.1439-0388.1990.tb00051.xCitations: 8 1 Research supported by the North Carolina Agricultural Research Service, Raleigh 27695-7601 and the national Association of Animal Breeders. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume107, Issue1-6January‐December 1990Pages 401-410 RelatedInformation}, number={6}, journal={JOURNAL OF ANIMAL BREEDING AND GENETICS-ZEITSCHRIFT FUR TIERZUCHTUNG UND ZUCHTUNGSBIOLOGIE}, author={FAUST, MA and ROBISON, OW and MCDANIEL, BT}, year={1990}, month={Dec}, pages={401–410} }
 @article{faust_mcdaniel_robison_1989, title={GENETICS OF REPRODUCTION IN PRIMIPAROUS HOLSTEINS}, volume={72}, ISSN={["0022-0302"]}, DOI={10.3168/jds.S0022-0302(89)79097-4}, abstractNote={Effects of genetics and relationships between yield and days from parturition to first service, first service conception rate, number of services, and a reproductive performance code based on several reproductive components were investigated in primiparous Holsteins. Recorded breedings and DHI production records were from 3393 daughters of 174 bulls in six experimental herds. Subsets included progeny of 78 sires, with greater than or equal to 5 daughters calving in April through July (n = 817) and August through March (n = 1162). Daughter-dam regressions (n = 2593 pairs) and paternal half-sibs were used to estimate heritabilities of fertility traits and associations between yield and reproduction. Results showed increased FCM was associated with lowered fertility. For paternal half-sibs, the greatest antagonism was between conception rates and FCM (rG = -.65 +/- .10). Daughter-dam regressions estimated a favorable genetic correlation of .43 +/- .32 between conception rates and yield. Heritabilities were highest for April through July calvings and ranged from .08 +/- .10 for first service conception to .24 +/- .12 for reproductive code. Correlations between sire least squares constants from warmer and cooler calving seasons were lower than heritabilities of traits would suggest.}, number={1}, journal={JOURNAL OF DAIRY SCIENCE}, author={FAUST, MA and MCDANIEL, BT and ROBISON, OW}, year={1989}, month={Jan}, pages={194–201} }
 @article{faust_robinson_mcdaniel_1989, title={The effects of cytoplasm on reproduction and production in Holsteins}, volume={72}, journal={Journal of Dairy Science}, author={Faust, M. A. and Robinson, O. W. and McDaniel, B. T.}, year={1989}, pages={52} }