creators_name: Nielsen, B.K.
creators_name: Thamsborg, S.M.
creators_name: Kristensen, T.
type: journalp
datestamp: 2003-10-10
lastmod: 2009-08-20 14:20:33
metadata_visibility: show
title: Feed Supplements for Young Dairy Breed Calves After Turn-Out to Pasture: Effect on Weight Gain and Subclinical Coccidiosis in Organic Production Systems
ispublished: pub
subjects: 3feeding
full_text_status: public
keywords: beef, health, organic farming, protein, ryegrass/white clover pasture
abstract: On two organic farms, the effect of supplementation with either home-grown barley or organic commercial concentrates primarily based on local protein sources and barley, on weight gain and subclinical coccidiosis was investigated in 3-5 months old dairy breed calves in the period after turn-out to ryegrass/clover pastures. The calves (mean liveweight ± SD, 124 ± 24 kg and 133 ± 24 kg on Farm I and II respectively) were supplemented daily with 3 kg energy and protein-rich commercial concentrates (group EP), 3 kg barley (group E) or ½ kg barley (group Eres) for 8 weeks following turn-out on pasture.

Daily weight gains in the 8 weeks were for Farm I: 1216 and 1042 g/day for group EP and E (P < 0.01) and for Farm II: 1071, 671 and 770 g/day for group EP, E and Eres respectively (P < 0.001). However, liveweights were similar between groups at housing, although group EP had significantly higher liveweight at housing on Farm I (P < 0.01). Initial liveweight had effects on daily gain in the grazing season, but supplementation with energy and protein reduced this effect on Farm I. No clinical signs of coccidiosis were observed, but markedly higher levels of oocysts per gram faeces (opg) were observed on Farm II, using pastures previously grazed by cattle compared to Farm I. Calves having a maximum oocyst count above 5 000 opg were subclinically affected by coccidiosis, as indicated by low faecal dry matter and reduction in daily gain of 222 g/day (P < 0.05). It is concluded that liveweight can be increased when supplementing calves with organic concentrates rich in energy and protein in the period following turn-out compared to supplementation with barley alone. However, the overall gain at the end of the grazing season is limited due to compensatory growth in the grazing period following supplementation.

date: 2003
date_type: published
publication: Acta Agric. Scand. Animal Science
volume: 53
pagerange: 1-10
refereed: yes
referencetext: Nielsen, B., S.M Thamsborg & T.Kristensen. 1999. The potential of organic beef production using dairy breed bull calves. Indlæg ved NJF-kongressen 1999, Ås, Norge, 28. juni-1.juli.
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Thamsborg, S.M., Søland, T.M., Pedersen, M.A. & Nielsen, B. 2001. Tilvækst og sundhed af 1. års stude i relation til race og belægningsgrad, 1998-2000. Forskning vedrørende naturpleje på Vestamager. Årsrapport 1998-99. Den Kgl. Vet. og Landbohøjskole. 13-20.
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Nielsen, B., S. M. Thamsborg, H. R. Andersen, and T. Kristensen. 2003. Effect of winter feeding level and season on herbage intake in dairy breed steers on perennial ryegrass / white clover pasture. Animal Science 76: 341-352.
Nielsen, B., S. M. Thamsborg, and T. Kristensen. 2003. Feed supplement to young dairy calves after turn-out to pasture: effect on weight gain and subclinical coccidiosis in organic production systems. Acta Agric. Scand. Animal Science 53:1-10. 
Nielsen, B., S. M. Thamsborg, H. R. Andersen, and T. Kristensen. 2003.Herbage intake in Danish Jersey and Danish Holstein steers on perennial ryegrass / white clover pasture. Livestock Production Science. In press.
Nielsen, B., A. R. Kristenen, and S. M. Thamsborg. 2003. Optimal decisions in organic steer production - A model including winter feed level, grazing strategy and slaughtering policy. Livestock Production Science. Accepted. 
Nielsen, B., T. Kristensen, and S. M. Thamsborg. 2003. Organic Steer Production Based on Dairy Breed Bull Calves - a Fram Study in Denmark. Acta Agric. Scand. Animal Science. Submitted.
Nielsen, B. and Thamsborg, S.M. 2003. Organic beef production with emphasis on welfare, health and product quality. Livestock Production Science. In preparation.
Nielsen, B. 2003. Dairy breed bull calves in organic beef production – with emphasis on rearing and fattening of steers. Ph.D. Thesis. Royal Vet. and Agric. Univ. Copenhagen, Denmark.  
Andersen, H.R., Kristensen, T., Bliggard, H.B., Madsen, N.T., Nielsen, B. 2003. Produktionssystemer for kontinuert produktion af efterårsfødte stude. DJF-rapport Husdyrbrug nr. 48. DJF-Foulum pp 90.

citation: Nielsen, Ph.D. stud. B.K.; Thamsborg, Professor S.M. and Kristensen, Dr. T. (2003) Feed Supplements for Young Dairy Breed Calves After Turn-Out to Pasture: Effect on Weight Gain and Subclinical Coccidiosis in Organic Production Systems. Acta Agric. Scand. Animal Science, 53, pp. 1-10.
document_url: http://orgprints.org/1396/1/Article.pdf