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Weaning-- Semen-- Estrus Detection-- Insemination-- Pregnancy Diagnosis--
Effect of Antimicrobial Supplementation on Satellite Cell Responsiveness to Growth Factors
Our research has shown that feeding low levels of antimicrobials to weanling pigs results in an increase in the concentration of the very potent positive growth factor, serum insulin-like growth factor-1 (IGF-1). The increase in IGF-1 can be detected within 4 days of initiation of the treatment and is not dependent on the increase in voluntary feed intake that typically accompanies antimicrobial supplementation.
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Evaluation of Genotype, Therapeutic Antibiotic and Health Management Effects and Interactions on Lean Growth Rate
Two hundred eighty eight pigs from two genetic populations differing in percent lean were used to evaluate the performance and carcass quality of these pigs under different environments, vaccination/antibiotic treatments and management systems. Yorkshire-Landrace sows were bred to U.S. Duroc sires selected for high liveweight gain/day (YL/Dur) EPD's. European Landrace-Large White/Duroc sows were mated to European Duroc-Hampshire sires (EUR).
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Role of Insulin-like Growth Factor Binding Protein-3 in Regulating Growth and Differentiation of Porcine Skeletal Muscle
Insulin-like growth factors (IGF) -1 and -2 are proteins that have potent anabolic and differentiation-promoting effects on muscle cells and these growth factors are thought to play a significant role in regulating growth and differentiation of muscle tissue in growing animals.
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An Innovative Approach for Studying Muscle Development in Pigs
Muscle satellite cells are ideal vehicles for delivery of genes to skeletal muscle. Muscle cells can be isolated from muscle, cultured and genetically engineered. Upon re-implantation into host muscle the cells are able to contribute their DNA to muscle by fusing with the existing muscle fibers. Other cells in muscle (e.g., fibroblasts) are important to muscle development and may also be useful for gene delivery. This type of cell-mediated gene transfer has been performed in other species, but not in pigs.
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Role of Insulin-like Growth Factor Binding Protein-3 Expression in Porcine Muscle
The long-term goal of our research is to elucidate the role of IGFBP-3 in porcine muscle development in order to more deeply understand muscle growth in pigs.
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Uptake and Utilization of Amino Acids by Porcine Mammary Tissue
Economic demands on the pork producer require that continued advances be made in optimizing sow productivity. Improved nutrition for the high-producing lactating sow is required in order to reap the full benefits of recent advances which have been obtained through improvements in genetics and management. The process of optimizing recommendations on amino acid requirements for lactating sows ultimately depends on an understanding of how the amino acids are utilized by the sow's mammary tissue.
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Relationships between Seminal Plasma Proteins and Boar Fertility: Development of a Proactive Semen Fertility Test (Year 1)
The objective of this study was to determine the relationship between seminal plasma proteins and semen fertility in boars. In the first experiment, ten boars were collected once per week for 26 consecutive weeks beginning in August and ending in January.
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