2019
DOI: 10.3168/jds.2018-16052
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In vivo measurement of strontium absorption from the rumen of dairy cows as an index of calcium absorption capacity

Abstract: Absorption of dietary calcium from the rumen is a quantitatively important process in calcium homeostasis of ruminants. In 3 separate experiments in dairy cows, we applied a technique developed in sheep to measure the rate of strontium (Sr) absorption from the rumen as an indicator of calcium absorption capacity. Absorption from the rumen after an oral dose of SrCl 2 resulted in a maximum plasma concentration of Sr after 1 h, whereas absorption from the small intestine after injection of SrCl 2 into the abomas… Show more

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Cited by 18 publications
(18 citation statements)
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“…Therefore, greater Ca flux rates determined for rumen tissue of lactating goats in comparison to dried-off animals (2.28 ± 0.35 v. 6.75 ± 1.16 nmol/cm 2 •h) could be either a direct effect of lactation or be caused by the different feeding regime and/or an enlargement of the luminal surface (Starke et al, 2016). In cows, rumen Ca transport estimated by the administration of stable strontium is stimulated by lactation and decreased when forestomach motility is reduced (Hyde et al, 2019). As impaired motility was observed with decreased plasma Ca concentrations (Daniel, 1983), inefficient ruminal Ca absorption following a disturbance of Ca mobilisation from the skeleton might aggravate hypocalcaemia in peripartum cows.…”
Section: Transcellular Pre-intestinal Calcium Absorptionmentioning
confidence: 95%
“…Therefore, greater Ca flux rates determined for rumen tissue of lactating goats in comparison to dried-off animals (2.28 ± 0.35 v. 6.75 ± 1.16 nmol/cm 2 •h) could be either a direct effect of lactation or be caused by the different feeding regime and/or an enlargement of the luminal surface (Starke et al, 2016). In cows, rumen Ca transport estimated by the administration of stable strontium is stimulated by lactation and decreased when forestomach motility is reduced (Hyde et al, 2019). As impaired motility was observed with decreased plasma Ca concentrations (Daniel, 1983), inefficient ruminal Ca absorption following a disturbance of Ca mobilisation from the skeleton might aggravate hypocalcaemia in peripartum cows.…”
Section: Transcellular Pre-intestinal Calcium Absorptionmentioning
confidence: 95%
“…Typically, Ca intake from the diet is a major contributor to blood Ca maintenance (Horst et al, 2005), suggesting that early-lactation cows may have multiple robust adaptations outside of intake alone to support the vigorous calcemic responses observed when compared with NL animals. One such adaptation may be ruminal Ca absorption, with recent research suggesting that the rumen can increase Ca absorptive capacity as a rapid-response mechanism to abrupt Ca perturbations (Hyde et al, 2019). Further, increases in intestinal Ca transport via both active and passive processes may also be part of the adaptive responses observed within this study (Horst et al, 2005).…”
Section: Discussionmentioning
confidence: 68%
“…In sheep, acidogenic diets increased the flux of Ca from the mucosal to the serosal side of the ruminal epithelia (Wilkens et al, 2016), supporting increased rumen transport of Ca under metabolic acidosis. In dairy cows, oral adminis-tration of strontium chloride, a marker used to study Ca absorption, showed an abrupt and faster increase in plasma strontium concentration compared with abomasal dosing (Hyde et al, 2019), thereby emphasizing the importance of the rumen in Ca absorption in bovine. Thus, the increased apparent Ca digestibility observed in the current experiment may be a combination of 1,25-dihydroxyvitamin D 3 regulating Ca absorption in the rumen, and possibly the small intestine.…”
Section: Discussionmentioning
confidence: 99%