A comparative study of herbage intake, ingestive behaviour and diet selection, and effects of condensed tannins upon body and wool growth in lambs grazing Yorkshire fog (Holcus lanatus) and annual ryegrass (Lolium multiflorum) dominant swards

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Abstract
An experiment was carried out from August to early November 1994 to examine differences in diet selection, herbage intake, grazing behaviour and animal performance between weaned lambs rotationally grazing swards of annual ryegrass (Lolium multiflorum)/white clover (Trifolium repens) and Yorkshire fog (Holcus lanatus)/T. repens with or without Lotus corniculatus. There were four replicate groups of six lambs per treatment. The effects of condensed tannins (CT) on lamb production were assessed by twice-daily oral administration of 10g polyethylene glycol (PEG; molecular weight 4000) to half the lambs on each sward. The Lotus content of all swards was very low, and results are presented here for main sward comparisons meaned over lotus treatments. Overall mean estimates of pre-grazing herbage mass and sward surface height for the annual ryegrass and Yorkshire fog swards respectively, were 5820 v. 4360±190 kgDM/ha (Pv. 21±0·6cm (Pv. 0·74 ± 0·080g/kg; Pv. 860±57g OM per lamb per day, Pv. 930g/kg±14g/kg, Pv. 110±15g/kg, Pv. 1280±30mg/cm per day, Pv. 29±0·2μ, Pv. 108±5·5g/day, Pv. 38±0·5kg, Pv. 69±2·5g/day, Pv. 17±0·3kg, Pv. 8±0·5mm, Pv. 11·0±0·4 eggs/g fresh faeces, Pv. 3·7 DM±0·2g/kg, Pv. 1310±32 mg/cm per day, Pv. 29·5±0·21μ, Pv. 120±4·3g per lamb per day, Pv. 18·2±0·3kg) and FEC transformed values (9·6 v. 11·0±0·6 eggs/g fresh faeces) were not significant. The effects of CT on animal performance were greater in Yorkshire fog swards. CT had no significant effects on diet selection, herbage intake and grazing behaviour patterns.

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