Highlights of the David Baker Symposium: Ideal Protein and Amino Acid Nutrition of Pigs
By: Dr. Emily Taylor
Invited speakers at the David Baker Symposium at the ADSA/ASAS Midwest Meeting tackled the symposium’s theme of Ideal Protein and Amino Acid Nutrition in Pigs
Dr. Chung, DSM Nutritional Products Asia Pacific, began the symposium “Ideal Protein – The Seminal North American Work,” reviewing the development of the purified AA diet cultivated by Dr. David Baker. This then provided an opportunity to improve the ideal AA pattern which true digestibility of AAs are 100%. Dr. Chung discussed research evaluating AA levels that were set above and below the NRC values using four indispensable AA patterns (IFP), modification of IFP and the Wang and Fuller ideal protein pattern.
Dr. Dean Boyd, The Hanor Company, Inc., stated that the greatest advancement in establishing AA requirements of domestic animals in the last 25 years has been the ideal protein concept. Dr. Boyd began his presentation “ Practical Application of the Ideal Protein Concept after Twenty-Five Years,” by reviewing the ideal protein concept while describing ideal protein as precisely meeting the physiologic needs of the animal. He continued to explain how the ideal AA pattern needed for both maintenance and growth are different while using early pregnancy vs. late pregnancy as an example. In addition, the ideal protein concept provided a sensible guide as to other essential amino acid needs for pigs with genetically different rates of protein deposition and response to dietary lysine.
Wesley Schweer, a graduate student at Iowa State University, presentation of “Increased Lysine: Metabolizable Energy Ratio Improves Grower Pig Performance during a Porcine Reproductive and Respiratory Syndrome Virus Challenge, “ by reviewing PRRSV and how it decreases pig performance. He also described how the AA requirement and Lys:ME ratio on health challenged pigs is not well understood. Two experiments were conducted to evaluate the effect of Increasing SID Lys:ME on growth performance during a PRRSV challenge. Results concluded an increase in the Lys:ME ratio by 110 to 120% improved performance and feed efficiency during a PRRSV challenge.
Dr. Wouter Hendriks, Wageningen University, began his presentation “ Amino Acid Availability in Heat-Damaged Ingredients,” by stating that the most variation in amino acid availability is digestibility and how heat damage has a direct affect. Specifically, processing (pelleting, extrusion and storage; which may include heat damage) of feedstuffs and how it affects the bioavailability of amino acids was reviewed.
John Mathai, a graduate student at the University of Illinois, continued the discussion of heat damage and how the variability of ingredients reduces precision during his presentation of “Effects of Various Heat Treatments on Concentrations of Digestible and Metabolizable Energy and on Amino Acid Digestibility in Soybean Meal Fed to Growing Pigs.” Two experiments were conducted to determine the DEand standardized ileal digestibility of AA in heat-treated soybean meal fed to growing pigs. Soybean meal was either autoclaved or not autoclaved for the simulation of heat damage. Results concluded that autoclaving at 110°C did not affect ME or SID of AA in soybean meal, however, autoclaving at 150°C had negative effects on ME and SID of AA in soybean meal as hating time increased.
Dr. Sung Woo Kim, North Carolina State University, began his presentation of “Ideal Protein for Sows: Consideration of Balances Among a Sow, Fetuses, Mammary Glands, and Milk,” by reviewing that the ideal amino acid ration may be affected by factors such as the number of fetuses, the number of mammary glands, stage of gestation for gestating sows, number of nursing piglets, number of lactating mammary glands and maternal tissue mobilization for lactating sows. Due to theses many changes in a sows ideal protein, phase feeding has been proposed, However, Dr. Kim stated that it has been difficult to practice phase feeding and parity feeding in sow farms due to limitation with feeding systems. He finished by describing the new advances in feeding systems and how it could allow these dynamic changes of ideal protein in feeding sows during gestation and lactation.
Dr. Kevin Touchette, Ajinomoto Heartland, Inc., reviewed the recent study “ Determination of SID Val:Lys Requirements in Lactating Sows.” Results concluded that dietary SID Val:Lys had no impact on pre-wean mortality or sow wean-to-estrus length. It was suggested that SID Val:Lys levels as low as 0.65 can be fed without negatively impacting sow or piglet performance.
Look for a link by email to access the talks virtually in the coming days.