PMID: 11906563Mar 22, 2002Paper

The effects of the primary growth of two ryegrasses on the dynamics of changes in digestibility and feed intake by sheep

Journal of Animal Physiology and Animal Nutrition
A OmbabiF Taube

Abstract

Dynamics of changes in digestibility and feed intake by sheep of two ryegrass species during primary growth Environmental impacts can cause short-term variations in chemical composition and feeding value of grass swards during growth and maturation and induce concomitant changes of intake of these grasses by animals. Continuous digestion trials are effective in observing the dynamics of these variations. Therefore this study was conducted to evaluate the effects of maturity-related alterations in the chemical composition of two ryegrass swards during primary growth on nutrient digestibilities and feed intake by sheep. Pure swards of perennial ryegrass (Lolium perenne L., variety Gremie) and Italian ryegrass (Lolium multiflorum Lam., variety Lema) were harvested daily during primary spring growth between 23 April and 19 June 1991 and each grass was offered to a group of five sheep for ad libitum intake. A continuous digestion trial design was employed to measure daily intakes and faecal outputs of organic matter (OM) and OM constituents. Digestibility values were calculated with the assumption that faecal output of day 2 represented the undigested nutrients of the grass eaten at day 0. Based on results of a preliminary study, da...Continue Reading

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