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Titolo:
Intake and growth of steers offered different allowances of autumn grass and concentrates
Autore:
French, P; ORiordan, EG; OKiely, P; Caffrey, PJ; Moloney, AP;
Indirizzi:
TEAGASC, Grange Res Ctr, Dunsany, Meath, Ireland TEAGASC Dunsany Meath Ireland C, Grange Res Ctr, Dunsany, Meath, Ireland Univ Coll Dublin, Fac Agr, Dublin 4, Ireland Univ Coll Dublin Dublin Ireland 4 oll Dublin, Fac Agr, Dublin 4, Ireland
Titolo Testata:
ANIMAL SCIENCE
, volume: 72, anno: 2001,
parte:, 1
pagine: 129 - 138
SICI:
1357-7298(200102)72:<129:IAGOSO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARCASS COMPOSITION; HERBAGE INTAKE; N-ALKANES; PERFORMANCE; PASTURE; SUPPLEMENTATION; HEIGHT; FORAGE; BULLS; COWS;
Keywords:
autumn; concentrates; grass intake; steers;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: French, P TEAGASC, Grange Res Ctr, Dunsany, Meath, Ireland TEAGASC Dunsany Meath Ireland Res Ctr, Dunsany, Meath, Ireland
Citazione:
P. French et al., "Intake and growth of steers offered different allowances of autumn grass and concentrates", ANIM SCI, 72, 2001, pp. 129-138

Abstract

The aim of this experiment was to quantify the relationship between autumngrass supply and concentrate supplementation level on grass intake and animal performance. Once hundred and ten continental steers (567 kg) were assigned to 10 treatments. The experimental design was a three grass allowances(6, 12 and 18 kg dry matter (DM) per head daily) by three concentrate levels: (0, 2.5 and 5 kg per head daily) factorial with a positive control group offered concentrates and libitum and no grass. Grass allowance was offered daily and concentrates were given individually. The experiment began on 22 August and all animals were slaughtered after a mean experimental period of 95 days. Grass intake was calculated using the n-alkane technique and diet digestibility using ytterbium acetate as an indigestible marker. There was an interaction (P < 0.05) between grass allowance and concentrate level for grass intake. At the low grass allowance there was no effect of offering animals supplementary concentrates on grass intake, at the medium and high grass allowances, supplementary concentrates reduced grass intake by 0.43and 0.81 kg DM respectively per kg DM concentrate offered. Increasing grass allowance increased (P < 0.001) complete diet organic matter (OM) digestibility at all concentrate levels and supplementary concentrates increased (P < 0.001) complete diet OM digestibility only at the low grass allowance. Both offering animals supplementary concentrates (P < 0.001) and increasingdaily grass allowance (P < 0.001) increased their carcass growth rate. Relative to the animals offered the low grass allowance and no concentrate, supplementing with concentrate increased carcass growth by 116 g/kg concentrate DM eaten whereas increasing the grass allowance, increased carcass growth by 38 g/kg DM grass eaten. As a strategy for increasing the performance of cattle grazing autumn grass, offering supplementary concentrates offers more scope than altering grass allowance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 04:34:12