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Phosphorus net absorption in dairy cows subjected to abomasal infusion of inorganic phosphorus – a pilot study
Author(s) -
Mogodiniyai Kasmaei K.,
Holtenius K.
Publication year - 2013
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/j.1439-0396.2012.01282.x
Subject(s) - latin square , excretion , zoology , abomasum , phosphorus , rumen , chemistry , dairy cattle , absorption (acoustics) , urine , feces , medicine , breed , endocrinology , biology , biochemistry , fermentation , paleontology , physics , organic chemistry , acoustics
Summary In this pilot study, the effects of phosphorus (P) supply on inorganic phosphorus (P i ) net absorption in dairy cows were investigated. Three non‐lactating, non‐pregnant, rumen‐fistulated Swedish Red breed dairy cows were studied in a 3 × 3 Latin square design. Monosodium dihydrogen orthophosphate dihydrate (NaH 2 PO 4 *2H 2 O) was continuously infused into the abomasum for 4 days. The solutions provided 0, 14.4 or 28.8 g P i /day. Rumen fluid volume and outflow rate were estimated at day four of each experimental period using cobalt‐lithium EDTA as an external marker. Acid insoluble ash in feeds and faecal samples was used to quantify P faecal excretion. Concentrations of P i in collected samples of rumen fluid, blood, faeces and urine were determined. P i flow into the small intestine increased (p < 0.05) with P i infusion. P i net absorption tended to increase (p = 0.08) but proportion of absorbed P i tended to decrease (p = 0.08). Urinary P i excretion was negligible and did not affect P homoeostasis (p = 0.50). There was no change in plasma P i concentration (p = 0.45) in response to P i infusion. The increase in total faecal P excretion (p < 0.05) with increasing level of infused P i was solely because of increased soluble faecal P i (p < 0.05). It is suggested that at P overfeeding, intestinal P i net absorption is saturable in dairy cows.