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Amino acid digestibility in low-fat distillers dried grains with solubles fed to growing pigs

Journal of Animal Science and Biotechnology 2014年第4期5卷 414-420页

作者： shelby marie curry Diego Mario David Labadan Navarro Ferdinando Nielsen Almeida Juliana Abranches Soares Almeida Hans Henrik Stein Department of Animal Sciences University of Illinois

The objective of this experiment was to determine the standardized ileal digestibility（SID） of amino acids（AA） in 3sources of distillers dried grains with solubles（DDGS） with different concentrations of fat.Twelve growing barrows（initial body weight：76.1 ± 6.2 kg） were randomly allotted to a replicated 6×4 Youden square design with 6 diets and 4 periods.The fat content of the 3 sources of DDGS were 11.5,7.5,and 6.9%respectively.Diets contained 60%DDGS and fat concentration of the diets were 7.5,52,and 5.2%,respectively.Two additional diets containing the 2sources of DDGS with 75 and 6.9%fat were also formulated,and corn oil was added to these diets to increase the concentration of fat in the diets to levels that were calculated to be similar to the diet containing conventional DDGS with 11.5%fat.A N-free diet was also formulated to calculate endogenous losses of crude protein（CP） and AA from the pigs.Pigs were fed experimental diets during four 7-d periods.The first 5 d of each period were an adaptation period and ileal digesta were collected on d 6 and 7 of each period.The apparent ileal digestibililty（AID） and SID of CP and all indispensable AA,except AID Pro and SID of Trp,were greater（P 〈 0.01） in conventional DDGS than in the 2 sources of DDGS with reduced fat.Adding oil to the diets containing the 2 sources of DDGS with reduced fat did not consistently increase SID of AA.In conclusion,conventional DDGS has greater SID values for most AA compared with DDGS that contains less fat and inclusion of additional oil to diets containing low-fat DDGS does not increase AID or SID of AA.The lower AA digestibility in low-fat DDGS could not be overcome by the inclusion of additional fat to the diets.

关键词： Amino acid digestibility Distillers dried grains with solubles Pigs

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Identification of C9-C11 unsaturated aldehydes as prediction markers of growth and feed intake for non-ruminant animals fed oxidized soybean oil

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Journal of Animal Science and Biotechnology 2020年第4期11卷 1033-1046页

作者： Jieyao Yuan Brian J.Kerr shelby M.curry Chi Chen Department of Food Science and Nutrition University of Minnesota1334 Eckles AvenueSt.PaulMN 55108USA USDA-ARS National Laboratory for Agriculture and the Environment 1015 N.University Boulevard2165 NSRICAmesIA 50011USA Oak Ridge Institute for Science and Education Oak RidgeTNUSA.

Background: The benefits of using the oxidized oils from rendering and recycling as an economic source of lipids and energy in animal feed always coexist with the concerns that diverse degradation products in these oxidized oils can negatively affect animal health and performance. Therefore, the quality markers that predict growth performance could be useful when feeding oxidized oils to non-ruminants. However, the correlations between growth performance and chemical profiles of oxidized oils have not been well examined. In this study, six thermally oxidized soybean oils(OSOs) with a wide range of quality measures were prepared under different processing temperatures and processing durations, including 45 °C-336 h;67.5 °C-168 h;90 °C-84 h;135 °C-42 h;180 °C-21 h;and225 °C-10.5 h. Broilers and nursery pigs were randomly assigned to diets containing either unheated control soybean oil or one of six OSOs. Animal performance was determined by measuring body weight gain, feed intake,and gain to feed ratio. The chemical profiles of OSOs were first evaluated by common indicative tests, including peroxide value, thiobarbituric acid reactive substances, p-anisidine value, free fatty acids, oxidized fatty acids,unsaponifiable matter, insoluble impurities, and moisture, and then analyzed by the liquid chromatography-mass spectrometry-based chemometric analysis.Results: Among common quality indicators, p-anisidine value(An V), which reflects the level of carbonyl compounds,had the greatest inverse correlation with the growth performance of both broilers and pigs, followed by free fatty acids and oxidized fatty acids. Among the 17 aldehydes identified in OSOs, C9-C11 alkenals, especially 2-decenal and 2-undecenal, had stronger inverse correlations(r <-0.8) with animal performance compared to C5-C8 saturated alkanals,suggesting that chain length and unsaturation level affect the toxicity of aldehydes.Conclusions: As the major lipid oxidation products contributing to the An V, individual C9-C11 unsaturated aldehydes in heavily-

关键词： Aldehydes Broiler Growth performance Pig Thermally oxidized soybean oil

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