Sows

Effects of concentration of calcium and phosphorus and 1-alpha-hydroxycholecalciferol (1-α-OH-D3) on digestibility and retention of calcium and phosphorus and concentration of digestible energy in diets fed to sows in late-gestation

Absorption of Ca and P by active transport in the small intestine is regulated by calcitriol, which is the active form of vitamin D (1,25-dihydroxycholecalciferol) and the hormones calcitonin and PTH. One-alpha-hydroxycholecalciferol (1-α-OH-D3) is an active vitamin D3 analog that does not require the second hydroxylation step for vitamin D3 to be active. It is possible that supplementation of 1-α-OH-D3 may increase absorption of Ca and P.

The requirement for Ca and P by gestating sows increases in late gestation compared with early- and mid-gestation because of increased needs by the developing fetuses. It is also possible that dietary concentrations of Ca and P affect the rate of absorption of Ca and P in sows but data to demonstrate this have not been reported. Therefore, the objective of this experiment was to test the hypothesis that the Ca and P concentrations in diets fed to gestating sows in late gestation and supplementation of 1-α-OH-D3 affect apparent total tract digestibility (ATTD) and retention of Ca and P as well as the ATTD of GE and concentration of DE in diets. The second hypothesis was that there is an interaction between dietary Ca and P concentrations and supplementation of 1-α-OH-D3 in diets fed to gestating sows.

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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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Digestibility, retention of Ca and P changes during gestation

Lee, S. A., and H. H. Stein. 2019. Digestibility, retention of Ca and P changes during gestation. National Hog Farmer. January 31, 2019. Link to full text.

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Sows in mid-gestation have reduced digestibility and retention of calcium and phosphorus compared with growing pigs

Lee, S., C. Walk, and H. Stein. 2018. Sows in mid-gestation have reduced digestibility and retention of calcium and phosphorus compared with growing pigs. 14th International Symposium on Digestive Physiology of Pigs. Adv. Anim. Biosci. Volume 9, Issue S2, 9:S193-194. (Abstr.). Link to abstract

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Basal endogenous loss, standardized total tract digestibility of calcium in calcium carbonate, and retention of calcium in gestating sows change during gestation, but microbial phytase reduces basal endogenous loss of calcium

Lee Su A., L. Vanessa Lagos, Carrie L. Walk, and Hans H. Stein. 2019. Basal endogenous loss, standardized total tract digestibility of calcium in calcium carbonate, and retention of calcium in gestating sows change during gestation, but microbial phytase reduces basal endogenous loss of calcium. J. Anim. Sci. 2019.97:1712–1721. Link to full text.

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The effect of canola on reproductive performance in sows

Smiricky-Tjardes, M. R., D. N. Peters, and H. H. Stein. 2003. The effect of canola on reproductive performance in sows. J. Anim. Sci. 81(Suppl. 1):17 (Abstr.) Link to abstract (.pdf)

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Effect of stage of lactation on colostrum and milk composition in multiparous sows

Mateo, C. D., H. H. Stein, M. R. Smiricky-Tjardes, and D. N. Peters. 2003. Effect of stage of lactation on colostrum and milk composition in multiparous sows. J. Anim. Sci. 81(Suppl. 2):67 (Abstr.) Link to abstract (.pdf)

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Effects of WEANMOR® feed additive on sow and litter performance

Loughmiller, J. A., B. Hardy, E. Cerchiari, B. Christopherson, H. H. Stein, and K. Hugoson. 2002. Effects of WEANMOR® feed additive on sow and litter performance. J. Anim. Sci. 80(Suppl. 1):160 (Abstr.)

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A technique for inserting a simple T-Cannula in the terminal ileum of pregnant sows

Stein, H. H. and R. A. Easter. 1996. A technique for inserting a simple T-Cannula in the terminal ileum of pregnant sows. J. Anim. Sci. 74(Suppl. 1):190 (Abstr.)

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Effect of lysine intake on reproductive performance in first parity sows

Wilson, M. E., H. H. Stein, N. L. Trottier, D. D. Hall, R. L. Moser, D. E. Orr, and R. A. Easter. 1996. Effect of lysine intake on reproductive performance in first parity sows. J. Anim. Sci. 74(Suppl. 1):63 (Abstr.)

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Formulating diets to reproducing and growing pigs using field peas

Stein, H. H. 2006. Formulating diets to reproducing and growing pigs using field peas. P 43-49 in Proc. 2nd joint meeting of the MPA of ND and NDPC. Fargo, ND, November 28-29, 2006. Link to full text (.pdf)

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Comparative amino acid digestibilities in adult sows and growing pigs

Stein, H. H., 1997. Comparative amino acid digestibilities in adult sows and growing pigs. In: Proc. of Swine Summit '97. p. 74-79. Heartland Lysine Inc., Chicago, IL USA.  Link to full text (.pdf)

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Endogenous secretions of proteins and amino acids in pregnant and lactating sows

Stein, H. H. and R. A. Easter, 1997. Endogenous secretions of proteins and amino acids in pregnant and lactating sows. In: J. P. LaPlace, C. Fevrier, and A. Barbeau (ED). Digestive physiology in pigs. EAAP publ. No 88. p. 321-324. St. Malo, France.  Link to full text (.pdf)

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Feeding the swine breeding herd

Stein, H. H., 1995. Feeding the swine breeding herd. In (Ed.: M. E. Ensminger): Libros De Discursos De La Escuela Agrotecnica International En Cuba 1995, Clovis, Ca.

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Weaning large litters

Stein, H. H. 2008. Weaning large litters. Pork Magazine, January issue, 24-25. Link to full text (.pdf)

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Amino acid requirements in lactating sows

Stein, H. H. 1996. Amino acid requirements in lactating sows. A review. In: University of Illinois Swine Research Reports, p. 32. Link to full text (.pdf)

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The endocrine involvement in reproductive problems in sows

Rodriquez-Marquez, M. C., J. M. Bahr, and H. H. Stein. 1995. The endocrine involvement in reproductive problems in sows. In: University of Illinois, Swine Research Reports, p. 45. Link to full text (.pdf)

Reducing heat stress in gilts and sows

Bull, R. B., P. B. Harrison, C. Santana, and H. H. Stein. 1995. Reducing heat stress in gilts and sows. In: University of Illinois, Swine Research Reports, p. 35. Link to full text (.pdf)

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A feeding strategy for pregnant sows

Stein, H. H. 1994. A feeding strategy for pregnant sows. University of Illinois Cooperative Extension Swine Report #113.

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Nucleotides in sows' colostrum and milk at different stages of lactation

Mateo, C. D., D. N. Peters, and H. H. Stein. 2004. Nucleotides in sows' colostrum and milk at different stages of lactation. J. Anim. Sci. 82:1339-1342. Link to full text (.pdf)

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