TITLE

Phophorus supplementation to natural pasture grazing for beef cows in the Western Highveld region of South Africa

AUTHOR(S)
de Brouwer, C. H. M.; Cilliers, J. W.; Vermaak, L. M.; van der Merwe, H. J.; Groenewald, P. C. N.
PUB. DATE
March 2000
SOURCE
South African Journal of Animal Science;2000, Vol. 30 Issue 1, p43
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Simmentaler cows grazing Cymbopogon-Themeda veld in the western Highveld region of South Africa (1985/86-1989/90) received three levels of phosphorus (P) supplementation. Dicalcium phosphate content of the supplement was manipulated to give intakes of 8 (CS), 4 (HS) or 0 (ZS) g P/cow/day during summer. All cows received supplemental P (10 g/cow/day) during winter (1986-1989). In 1990, supplemental P (10 (CW), 5 (HW) or 0 (ZW) g P/cow/day) was given in a winter maintenance supplement (protein, energy and minerals). Rainfall was above average during the trial period. Reproductive performance was not influenced by P supplementation. Mean livemass of the CS group was greatest (p < 0.01), and that of HS was greater (p < 0.01) than ZS at the end of summer. Both CS and HS had better (p < 0.01) condition scores than ZS. Bone P content was lowest and indicative of deficiency (p < 0.01) in ZS cows (112.6 vs 141.9 and 130.8 mg P/cm[sub 3] bone for CS and HS respectively). Calf performance was not affected (p > 0.05) by P supplementation. Cow mass was affected by winter P supplementation (p < 0.05). Both CW and HW displayed improved (p < 0.01) condition scores and higher (p < 0.01) bone P content than ZW. Fatalities (4) occurred in ZW due to P deficiency (74.5 mg P/cm[sub 3] bone), and deficiency symptoms were manifested in the entire group. Both summer and winter veld is deficient in P, which makes continuous supplementation a recommended practice in this area.
ACCESSION #
3901466

Tags: BEEF cattle -- Feeding & feeds;  PHOSPHORUS -- Physiological effect;  PASTURES

 

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