Lagos

Oven drying of ileal digesta from growing pigs reduces the concentration of AA compared with freeze drying and results in reduced calculated values for endogenous losses and elevated estimates for ileal digestibility of AA

Lagos L. Vanessa, and Hans H. Stein. 2019. Oven drying of ileal digesta from growing pigs reduces the concentration of AA compared with freeze drying and results in reduced calculated values for endogenous losses and elevated estimates for ileal digestibility of AA. J. Anim. Sci. 2019.97:820–828. Link to full text.

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Effects of microbial phytase on mucin synthesis, gastric protein hydrolysis, and degradation of phytate along the gastrointestinal tract of growing pigs

Mesina Von G. R., L. Vanessa Lagos, Rommel C. Sulabo, Carrie L. Walk, and Hans H. Stein. 2019. Effects of microbial phytase on mucin synthesis, gastric protein hydrolysis, and degradation of phytate along the gastrointestinal tract of growing pigs. J. Anim. Sci. 2019.97:756–767. Link to full text.

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Effects of dietary digestible calcium on growth performance and bone ash concentration in 50- to 85-kg growing pigs fed diets with different concentrations of digestible phosphorus

Lagos L. V., C. L. Walk, M. R. Murphy, H. H. Stein. 2019. Effects of dietary digestible calcium on growth performance and bone ash concentration in 50- to 85-kg growing pigs fed diets with different concentrations of digestible phosphorus. Anim. Feed Sci. Technol. 247: 262 - 272. Link to full text.

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Influence of the concentration of dietary digestible calcium on growth performance, bone ash, and abundance of genes involved in intestinal absorption of calcium in pigs from 11 to 25 kg fed diets with different concentrations of digestible phosphorus

Requirements for P for growing pigs are expressed as the requirement for standardized total tract digestible (STTD) P, whereas requirements for Ca are usually expressed as requirements for total Ca. It is, however, recognized that diets for pigs are most accurately formulated based on a STTD Ca:STTD P ratio, and recent work has generated values for STTD of Ca in most Ca containing feed ingredients, which makes it possible to formulate diets based on STTD Ca.

Recent data from the University of Illinois have indicated that if STTD P is at the requirement, a ratio between STTD Ca and STTD P that is less than 1.35:1, 1.25:1, and 1.10:1 maximizes growth performance of pigs from 25 to 50 kg, 50 to 85 kg, and 100 to 130 kg, respectively. However, the STTD Ca:STTD P ratio needed to maximize bone ash is greater than the ratio needed to maximize growth performance. An attempt to estimate the requirement for STTD Ca by pigs from 11 to 25 kg was also made, but due to a reduction in ADG and G:F as dietary Ca increased, an optimal STTD Ca:STTD P ratio could not be estimated.

Calcium may be absorbed by transcellular or paracellular transport. Transcellular transport is the primary route if dietary Ca is low, but if dietary Ca is adequate or high, Ca is mainly absorbed using the paracellular route via the tight junctions. However, there are limited data demonstrating effects of dietary Ca concentration on abundance of genes related to transcellular and paracellular transport of Ca in the small intestine of pigs.

Therefore, the objectives of this experiment were to test the hypotheses that a STTD Ca:STTD P ratio less than 1.40:1 maximizes growth performance of pigs from 11 to 25 kg and that increasing dietary Ca downregulates abundance of genes related to transcellular absorption of Ca and tight junction proteins in the small intestine.

 

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Effect of dietary calcium on growth performance of growing pigs

S. A. Lee, Vanessa Lagos, and Hans H. Stein. 2018. Effect of dietary calcium on growth performance of growing pigs. Pages 173 - 184. XXXIV Specialization Course FEDNA, Madrid, Nov. 22 - 23, 2018. Link to full text (.pdf)

 

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Non-antibiotic feed additives in diets for pigs: A review

Yanhong Liu, Charmaine D. Espinosa, Jerubella J. Abelilla, Gloria A. Casas, L. Vanessa Lagos, Su A. Lee, Woong B. Kwon, John K. Mathai, Diego M.D.L. Navarro, Neil W. Jaworski, Hans H. Stein. 2018. Non-antibiotic feed additives in diets for pigs: A review. Anim. Nutr. 4:113-125. Link to full text (.pdf)

Effect of drying method of ileal digesta on the digestibility of crude protein and amino acids by pigs

Lagos, L. V. and H. H. Stein. 2018. Effect of drying method of ileal digesta on the digestibility of crude protein and amino acids by pigs. J. Anim. Sci. 96(Suppl. 2):181 (Abstr.) Link to abstract (.pdf)

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Requirement for digestible calcium at different dietary concentrations of digestible phosphorus indicated by growth performance and bone ash of 50 to 85 kg pigs

Lagos, L. V., C. L. Walk, and H. H. Stein. 2018. Requirement for digestible calcium at different dietary concentrations of digestible phosphorus indicated by growth performance and bone ash of 50 to 85 kg pigs. J. Anim. Sci. 96(Suppl. 2):130-131 (Abstr.) Link to abstract (.pdf)

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Chemical composition and amino acid digestibility of soybean meal produced in the United States, China, Argentina, Brazil, or India

Lagos, L. V. and H. H. Stein. 2017. Chemical composition and amino acid digestibility of soybean meal produced in the United States, China, Argentina, Brazil, or India. J. Anim. Sci. 95:1626-1636. Link to full text (.pdf)

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Chemical composition and amino acid digestibility of soybean meal produced in the United States, China, Argentina, Brazil, or India

Lagos, L. V. and H. H. Stein. 2017. Chemical composition and amino acid digestibility of soybean meal produced in the United States, China, Argentina, Brazil, or India. J. Anim. Sci. 95(Suppl. 5):93 (Abstr.) Link to abstract (.pdf)

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Non-antibiotic feed additives in diets for pigs

Liu, Y., D. Espinosa, J. J. Abelilla, G. A. Casas, L. V. Lagos, S. A. Lee, W. B. Kwon, J. K. Mathai, D. M.D. L. Navarro, N. W. Jaworski, and H. H. Stein. 2016. Non-antibiotic feed additives in diets for pigs. Pages 263-281 in Proceedings of the 2016 Chinese Swine Industry Symposium, Shanghai, China, October 20-21, 2016. Link to full text (.pdf)

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Amino acid digestibility in soybean meal produced in the United States, Brazil, Argentina, India, or China

Soybean meal is the premier source of high quality plant protein for pig diets. However, the nutritional value of soybean meal can vary among sources due to genetic differences in soybean varieties or differences in climate, soil type, fertilizer application, or processing conditions. It is important that these variations be documented so that producers can accurately formulate diets. Therefore, an experiment was conducted to determine if standardized ileal digestibility (SID) of crude protein and amino acids varied among sources of soybean meal from the U.S., Brazil, Argentina, India, or China.

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Nutritional value of feed ingredients of plant origin fed to pigs

Stein, H. H., L. V. Lagos, and G. A. Casas. 2016. Nutritional value of feed ingredients of plant origin fed to pigs. Anim. Feed Sci. Technol. 218:33-69. Link to full text (.pdf)

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