אסיף מאגר המחקר החקלאי

Metabolic and productive responses of dairy cows to increased ion supplementation at early lactation in warm weather

Year:

1998

Source of publication :

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Volume :

65

Co-Authors:

Silanikove, N., Institute of Animal Science, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Maltz, E., Inst. of Agricultural Engineering, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Science, Agricultural Research Organization, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Bogin, E., Kimaron Veterinary Institute, Bet Dagan 50 250, Israel
Bastholm, T., Dept. of Anim. Sci. and Anim. Health, Roy. Vet. and Agric. University, DK-1871 Frederiksberg C, Denmark
Christensen, N.J., Dept. of Anim. Sci. and Anim. Health, Roy. Vet. and Agric. University, DK-1871 Frederiksberg C, Denmark
Norggarrd, P., Dept. of Anim. Sci. and Anim. Health, Roy. Vet. and Agric. University, DK-1871 Frederiksberg C, Denmark

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Abstract:

We found previously that the current recommendations for Na+, K+, and Cl- contents in the diet do not meet the needs of lactating cows. The responses of cows receiving a ration with increased amounts of Na+, K+, and Cl- (E cows) were compared with those of cows consuming the same ration with a fixed concentration of these ions (C cows) between weeks 2 and 8 post partum (PP). Milk, protein, fat and lactose yields, and dry matter intake between weeks 2 and 4 PP were higher in E than in C cows. These differences did not occur between weeks 4 and 8 PP, mainly because of a higher incidence of PP complications in E cows. A greater increase in plasma insulin-like growth factor-1 concentration in E than in C animals during weeks 2 and 3 PP was consistent with the milk responses. A reduction in aldosterone concentration in E cows in weeks 2 and 3 PP was a consequence of their Na+ requirements being satisfied as a result of their enhanced Na+ intake. A subsequent elevation in aldosterone concentration in E animals was probably related to a moderate excess in K+ intake. This increase in aldosterone explains the urinary potassium loss that was detected at week 6 PP. The absence of differences between E and C cows in plasma renin activity was consistent with an absence of differences in urine volume and with the apparent utilization of the enhanced ion intake for body functions.

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