Lagos

Reduced concentrations of limestone and monocalcium phosphate in diets without or with microbial phytase did not influence gastric pH, fecal score, or growth performance, but reduced bone ash and serum albumin in weanling pigs

Lagos, L. Vanessa, Su A Lee, Mike R. Bedford, and Hans H. Stein. 2021. Reduced concentrations of limestone and monocalcium phosphate in diets without or with microbial phytase did not influence gastric pH, fecal score, or growth performance, but reduced bone ash and serum albumin in weanling pigs. Transl. Anim. Sci. 2021.5:1-10. doi.org/10.1093/tas/txab115.

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Effects of reducing the concentration of Ca and P and increasing microbial phytase on gastric pH, fecal score, plasma inositol, growth performance, and bone ash of weanling pigs

The limited capacity for weanling pigs to secret HCl in the stomach may be exacerbated by inclusion of ingredients with high acid binding capacity such as limestone and monocalcium phosphate. As a consequence, reducing the amount of these 2 ingredients in diets for weanling pigs may contribute to a stable low pH for proper pepsin activity and increased action of microbial phytase. Inclusion of high doses of phytase that results in increased phytate degradation and increased release of Ca, P, and inositol may also be beneficial to newly weaned pigs. Therefore, an experiment was conducted to test the hypothesis that lowering dietary Ca and P reduces gastric pH and diarrhea of weanling pigs, but microbial phytase may overcome negative effects of low Ca and P on growth performance and bone ash.

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Quantities of ash, Ca, and P in metacarpals, metatarsals, and tibia are better correlated with total body bone ash in growing pigs than ash, Ca, and P in other bones

Lee, Su A, L. Vanessa Lagos, Mike R. Bedford, and Hans H. Stein. 2021. Quantities of ash, Ca, and P in metacarpals, metatarsals, and tibia are better correlated with total body bone ash in growing pigs than ash, Ca, and P in other bones. Journal of Animal Science, 2021, Vol. 99, No. 6, 1–6. doi:10.1093/jas/skab149.

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Formulation of diets for pigs based on a ratio between digestible calcium and digestible phosphorus results in reduced excretion of calcium in urine without affecting retention of calcium and phosphorus compared with formulation based on values for total

Lagos, L. Vanessa, Su A Lee, Mike R. Bedford, and Hans H. Stein. 2021. Formulation of diets for pigs based on a ratio between digestible calcium and digestible phosphorus results in reduced excretion of calcium in urine without affecting retention of calcium and phosphorus compared with formulation based on values for total calcium. Journal of Animal Science, 2021, Vol. 99, No. 5, 1–7. doi:10.1093/jas/skab138.

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Effects of Reducing the Concentration of Ca and P and Increasing Microbial Phytase on Gastric Ph, Fecal Score, Growth Performance, and Bone Ash of Weanling Pigs

Lagos, L. V., M. R. Bedford, and H. H. Stein. 2021. Effects of Reducing the Concentration of Ca and P and Increasing Microbial Phytase on Gastric Ph, Fecal Score, Growth Performance, and Bone Ash of Weanling Pigs. Journal of Animal Science, Volume 99, Issue Supplement_1, May 2021, Page 44-45. doi.org/10.1093/jas/skab054.077 (Abstr.) Link to Abstract.

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Formulating diets based on digestible calcium instead of total calcium does not affect growth performance or carcass characteristics, but microbial phytase ameliorates bone resorption caused by low calcium in diets fed to pigs from 11 to 130 kg

Lagos, L. Vanessa, Su A Lee, Mike R. Bedford, and Hans H. Stein. 2021. Formulating diets based on digestible calcium instead of total calcium does not affect growth performance or carcass characteristics, but microbial phytase ameliorates bone resorption caused by low calcium in diets fed to pigs from 11 to 130 kg. Journal of Animal Science, 2021, Vol. 99, No. 3, 1–11. doi:10.1093/jas/skab057.

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Effect of reducing the concentration of limestone and monocalcium phosphate in diets without or with microbial phytase on gastric pH, fecal score, growth performance, and bone ash of weanling pigs

Weanling pigs have reduced secretion of HCl in the stomach needed for appropriate protein digestion. Therefore, acidifiers are sometimes used in weaning diets as alternatives to antibiotic growth promoters because these products may create a favorable environment in the stomach for proper pepsin activity. However, the presence of limestone and monocalcium phosphate (MCP) in phase 1 diets, which have a high buffer capacity, may contribute to the inability for pigs to secrete enough HCl in the stomach, and lowering the inclusion level of these ingredients in starter diets may be beneficial to young pigs. Therefore, the objective of this experiment was to test the hypothesis that reducing the amount of limestone and MCP in diets for weanling pigs, by lowering the concentration of dietary Ca and P and(or) by including microbial phytase in the diet, will reduce stomach pH and fecal score and therefore improve growth performance of pigs.

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Effect of sample preparation method and drying method on the concentration of energy in urine and the concentration of metabolizable energy in diets fed to pigs

To obtain accurate values for metabolizable energy (ME) in diets and ingredients, an accurate estimation of gross energy (GE) in urine is required. Urine samples are often prepared following the freeze-dried cotton-plastic bag method and GE is determined by the ignition of the sample in a bomb calorimeter. However, the concentration of GE in urine can also be determined by dripping urine on a cellulose pellet, which can then be ignited in a bomb calorimeter. Alternatively, energy in urine can be calculated from the concentration of N in urine assuming that all energy in urine originates from N. The latter 2 methods may be less expensive and less time consuming than using the freeze-dried cotton-plastic bag method. Likewise, oven drying instead of freeze drying of samples may reduce time and cost of the drying procedure. However, to our knowledge, no data comparing values for GE in urine and ME in diets among different sample preparation and drying methods are available. Therefore, the objective of this study was to test the hypothesis that there are no differences in GE of urine or ME values of diets among sample preparation methods (freeze-dried cotton-plastic bag, undried cellulose pellet, or N value method). The second hypothesis was that drying method (freeze drying or oven drying) of cotton-plastic bag urine samples from pigs do not influence analyzed the GE in urine or calculated ME in diets.

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Effect of formulating diets based on a ratio between STTD Ca and STTD P and the inclusion of phytase on the calcium and phosphorus balance of growing pigs

Lagos, Vanessa, Mike R. Bedford, Hans H. Stein. 2020. Effect of formulating diets based on a ratio between STTD Ca and STTD P and the inclusion of phytase on the calcium and phosphorus balance of growing pigs. Journal of Animal Science, Volume 98, Issue Supplement_3, November 2020, Pages 103 - 104. (Abstr.). Link to abstract.

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Enhanced torula yeast has increased nutritional value compared to fish meal when fed to weanling pigs

Lancheros, Paola, Vanessa Lagos, Hans H Stein. 2020. Enhanced torula yeast has increased nutritional value compared to fish meal when fed to weanling pigs. Journal of Animal Science, Volume 98, Issue Supplement_3, November 2020, Page 62. (Abstr.). Link to abstract.

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Nutritional value of a new source of fermented soybean meal fed to growing pigs

Espinosa, Charmaine D. , Maryane S. F. Oliveira, L. Vanessa Lagos, Terry L. Weeden, Aileen J. Mercado, and Hans H. Stein. 2000. Nutritional value of a new source of fermented soybean meal fed to growing pigs. Journal of Animal Science, 2020, Vol. 98, No. 12, 1–9. doi:10.1093/jas/skaa357. Link to full text.

Effect of torula yeast on growth performance, diarrhea incidence, and blood characteristics in weanling pigs

Espinosa, Charmaine D., L. Vanessa Lagos, and Hans H. Stein. 2020. Effect of torula yeast on growth performance, diarrhea incidence, and blood characteristics in weanling pigs. Journal of Animal Science, 2020, Vol. 98, No. 10, 1–9. doi:10.1093/jas/skaa307. Link to full text.
 

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Digestible and metabolizable energy in soybean meal sourced from different countries and fed to pigs

Lopez, Diego A., L. Vanessa Lagos, Hans H. Stein. 2020. Digestible and metabolizable energy in soybean meal sourced from different countries and fed to pigs. Animal Feed Science and Technology 268: 114600. https://doi.org/10.1016/j.anifeedsci.2020.114600.

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Effect of formulating diets based on a ratio between STTD Ca and STTD P and the inclusion of phytase on the calcium and phosphorus balance of growing pigs

Several experiments were conducted to estimate Ca digestibility in different feed ingredients in the presence or absence of microbial phytase to allow formulation of diets for pigs to be based on standardized total tract digestible (STTD) Ca instead of total Ca. Thus, 4 experiments aimed at determining Ca requirements expressed as a ratio between STTD Ca and STTD P in pigs from 11 to 130 kg. A follow-up study was later conducted to validate those data and to evaluate the effect of using ratios that maximize growth performance on bone development because maximum bone ash requires more Ca than maximum growth performance. However, data indicate that STTD Ca to STTD P ratios to maximize Ca retention are greater than to maximize bone ash synthesis. The use of STTD Ca to STTD P ratios in diet formulation may result in a reduction in excess dietary Ca, which is beneficial because excess dietary Ca is detrimental to P digestibility and growth performance of pigs. Therefore, the objective of this experiment was to test the hypothesis that formulating diets for growing pigs based on a ratio between STTD Ca and STTD P instead of total Ca and STTD P does not decrease Ca retention, but increases P utilization.

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Effect of formulating diets based on a ratio between STTD Ca and STTD P and the inclusion of phytase on growth performance, bone ash, plasma Ca and P, and carcass characteristics of pigs from 11 to 130 kg

Calcium requirements by pigs are expressed as total Ca because of a lack of data for the digestibility of Ca in feed ingredients, but it is believed that a ratio between standardized total tract digestible (STTD) Ca and STTD P is a more appropriate way to express requirements for Ca by pigs. Values for Ca digestibility in different Ca-containing feed ingredients were recently generated using diets without or with microbial phytase, which allowed for the formulation of diets based on STTD Ca values. A number of experiments were also conducted to determine STTD Ca to STTD P requirements to optimize growth performance and bone mineralization of pigs from 11 to 25 kg, 25 to 50 kg, 50 to 85 kg, and 100 to 130 kg. However, these experiments were performed independently and in experiments lasting only 3 to 5 weeks. Therefore, a follow-up experiment was conducted to test the hypothesis that the requirement for Ca expressed as a ratio between STTD Ca and STTD P obtained in short-term experiments may be applied to pigs fed diets without or with microbial phytase from 11 to 130 kg.

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Increasing calcium from deficient to adequate concentration in diets for gestating sows decreases digestibility of phosphorus and reduces serum concentration of a bone resorption biomarker

Lee, Su A.,  L. Vanessa Lagos, Mike R. Bedford, and Hans H. Stein. 2020. Increasing calcium from deficient to adequate concentration in diets for gestating sows decreases digestibility of phosphorus and reduces serum concentration of a bone resorption biomarker. Journal of Animal Science, 2020,  Vol. 98: No. 3:1-8.

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Torula yeast has greater digestibility of amino acids and phosphorus, but not energy, compared with a commercial source of fish meal fed to weanling pigs

Lagos, Vanessa L., Hans H. Stein. 2020. Torula yeast has greater digestibility of amino acids and phosphorus, but not energy, compared with a commercial source of fish meal fed to weanling pigs. Journal of Animal Science, 2020, 1-9. doi:10.1093/jas/skz375. Link to full text.

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Digestible and metabolizable energy by pigs in soybean meal sourced from different countries.

Lopez, D. A., L. V. Lagos, and H. H. Stein. 2019. Digestible and metabolizable energy by pigs in soybean meal sourced from different countries. Book of Abstracts. In: 1st International Feed Technology Congress, Cologne, Germany. p. 26. (Abstr.). Link to Abstract.

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Nutrient composition and energy concentration in soybean meal from 5 different countries fed to pigs

Lagos, L. V., D. A. Lopez, and H. H. Stein. 2019. Nutrient composition and energy concentration in soybean meal from 5 different countries fed to pigs. In: 6th EAAP International Symposium on Energy and Protein Metabolism and Nutrition, Belo Horizonte, Minas Gerais, Brazil, Sep. 9-12, 2019. Pages 159-160. (Abstr.). Link to full text

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Influence of the level of dietary digestible Ca on growth performance, bone ash, plasma Ca, and abundance of genes involved in Ca absorption in 11- to 25-kg pigs fed different levels of digestible P

Lagos Vanessa, Carrie L. Walk, Hans H. Stein. 2019. Influence of the level of dietary digestible Ca on growth performance, bone ash, plasma Ca, and abundance of genes involved in Ca absorption in 11- to 25-kg pigs fed different levels of digestible P. Journal of Animal Science, Volume 97, Issue Supplement_2, July 2019, Pages 98–99. (Abstr.). Link to abstract

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