Urinary calcium excretion in non-lactating dairy cows in relation to intake of fat-coated rice bran.
J Anim Physiol Anim Nutr (Berl)
; 94(1): 129-36, 2010 Feb 01.
Article
in En
| MEDLINE
| ID: mdl-19364378
ABSTRACT
At calving, many older cows fail to compensate the sudden demand of calcium by an adequate activation of intestinal absorption. This results in a variable degree of hypocalcaemia. Reducing intestinal availability of calcium during the close-up period can prevent milk fever. Fat-coated rice bran (FCRB) was investigated for its potential to reduce Ca availability in pre-calving cows. Fat-coated rice bran was incubated in situ to estimate ruminal degradation of dry matter and phytic acid. Also, seven dry multiparous dairy cows were used for a feeding trial in three periods of approximately 1 week each P1 adaptation; P2 feeding of 2 kg of FCRB and P3 withdrawal of FCRB. Feed intake was recorded and daily urine samples were analysed for pH, Ca and creatinine. The bypass fraction of phytic acid (passage rate 5%/h) was 30%. Fat-coated rice bran depressed dry matter intake in P2, resulting in a lower Ca intake. In P2 urine pH and calcium excretion were lower. Daily calcium excretion decreased after introduction of FCRB, peaked after withdrawal and dropped 2 days later. Changes in urinary Ca excretion by feeding FCRB indicate that FCRB affected Ca homeostasis in dry multiparous dairy cows.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oryza
/
Plant Oils
/
Cattle Diseases
/
Calcium
/
Diet
/
Animal Feed
Limits:
Animals
/
Pregnancy
Language:
En
Journal:
J Anim Physiol Anim Nutr (Berl)
Journal subject:
CIENCIAS DA NUTRICAO
/
FISIOLOGIA
/
MEDICINA VETERINARIA
Year:
2010
Document type:
Article
Affiliation country:
Netherlands
Publication country:
ALEMANHA
/
ALEMANIA
/
DE
/
DEUSTCHLAND
/
GERMANY