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Titolo:
Effects of concentrate level and grazing system on the performance of beefcattle grazing autumn herbage
Autore:
French, P; ORiordan, EG; Moloney, AP; OKiely, P; Caffrey, PJ;
Indirizzi:
TEAGASC, Grange Res Ctr, Dunsany, Meath, Ireland TEAGASC Dunsany Meath Ireland C, Grange Res Ctr, Dunsany, Meath, Ireland
Titolo Testata:
IRISH JOURNAL OF AGRICULTURAL AND FOOD RESEARCH
fascicolo: 1, volume: 40, anno: 2001,
pagine: 33 - 44
SICI:
0791-6833(200106)40:1<33:EOCLAG>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARCASS COMPOSITION; PASTURE; GROWTH; SUPPLEMENTATION; SEASON; ENERGY; BULLS; AGE;
Keywords:
autumn grass; concentrate; leader/follower; 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., "Effects of concentrate level and grazing system on the performance of beefcattle grazing autumn herbage", IRISH J A F, 40(1), 2001, pp. 33-44

Abstract

To identify strategies for improving the growth rate of cattle grazing autumn grass, the effects of grazing management and supplementation with concentrates were quantified. Continental crossbred steers (n = 60; mean live weight 504 kg) were blocked according to live weight and assigned at random from within blocks to six treatments. The treatments were: an allowance of 11 kg grass dry matter (DM) per head daily, supplemented with 0 (control), 2.5 or 5 kg concentrates, an allowance of 11 kg grass DM per head daily without concentrates but managed as leaders or followers within a leader/follower system and concentrates offered ad libitum (no grass). Grass allowances were based on the yield when cut to 4-cm stubble. Animals were offered grass in groups, according to treatment, with herbage allowances adjusted dailywhile concentrates were offered individually. Grass intake was estimated as the difference between the pre- and post-grazing yields. The experiment began on 22 August and had a mean duration of 84 days. Supplementation with concentrates decreased grass intake but increased final live weight (P < 0.001), carcass weight (P < 0.001), carcass conformation score (P < 0.001) and carcass fat score (P < 0.05). The leader animals had higher (P < 0.001) and the follower animals had lower (P < 0.001) carcass gains compared with the control group of steers. The carcass gain response (kg/day) to concentrates (Y) was linearly related to concentrate allowance (X) according to the equation: Y = 0.0925X + 0.3874 (R-2 0.54). When supplemented with 5 kg concentrates, grass-fed animals had similar growth rates to the ad-libitum concentrate treatment. It is concluded that supplementing cattle, grazing autumn grass, with concentrates supported carcass growth rates closer to their potential than altering the grazing management strategy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:49:07