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Animal Production Science Animal Production Science Society
Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Alternative fibre sources for steers and calves fed high-grain feedlot diets

V. Beretta A C , A. Simeone A , J. C. Elizalde A , J. Franco A , O. Bentancur A , A. Ferrés B , S. Ayçaguer A , J. Iriñiz A and V. Martínez A
+ Author Affiliations
- Author Affiliations

A Animal Science, University of Uruguay, Ruta 363, CP 60000, Paysandú, Uruguay.

B AUPCIN, Cattle Feeders Association, Brenda 6056, CP 11500, Montevideo, Uruguay.

C Corresponding author. Email: beretta@fagro.edu.uy

Animal Production Science 50(6) 410-413 https://doi.org/10.1071/AN09173
Submitted: 2 December 2009  Accepted: 29 April 2010   Published: 11 June 2010

Abstract

An experiment was conducted to evaluate the effect of fibre source (FS) in high-grain feedlot diets on liveweight gain (LWG) of steers and calves and carcass traits of steers at slaughter. Eighteen steers (330 ± 27.3 kg) and 18 calves (153 ± 11.9 kg) were randomly allotted within animal category to one of three high-grain diets varying in the FS, including either grass hay (H, 66% neutral detergent fibre (NDF)), rice hulls (RH, 85% NDF) or wood chips (W, 90% NDF), and a total mixed ration formulated for equal levels of digestible DM, crude protein and NDF, within category. Animals were individually fed (3 kg DM/100 kg LW, distributed in four meals) during 56 days. The LW increased linearly with time in all treatments (P < 0.01). FS did not affect calves’ LWG (P > 0.05), but it resulted in differences in steers LWG (H: 1.77b; RH: 1.51c; W: 2.02a kg/day, P < 0.05). However, no differences were observed in hot carcass weight (P > 0.05), which resulted in higher carcass yield (P < 0.05) for steers fed RH (55.0%) compared with H (53.5%) and W (53.3%). There was a significant interaction (P < 0.05) for feed : gain ratio, with an improvement of this value observed only for steers fed the W diet. Although varying the FS affected rumination of calves and steers (P < 0.01) and the time spent eating of steers (P < 0.05), it did not represent any constraint for animal production. This study suggests by-products high in fibre content, such as RH and W, could be used in substitution to H in high-grain feedlot diets when fed at equal NDF concentration in the ration, both for calves and steers. Because calves are sometimes grown on a high-concentrate diet during winter before spring grazing, further research is needed to quantify potential residual effects on LWG after they return to pasture.


References


AFRC (1993) ‘Energy and protein requirements of ruminants.’ (CAB International: Cambridge)

Arelovich HM , Abney CS , Vizcarra JA , Galyean ML (2008) Effects of dietary neutral detergent fiber on intakes of dry matter and net energy by dairy and beef cattle: analysis of published data. Professional Animal Scientist 24, 375–383. Available at http://pas.fass.org/content/24/5/375.short [Verified 15 April 2010].

Beretta V , Simeone A , Elizalde JC , Collares M , Macció M , Varalla D (2008) Fibre management in high-grain feedlot diets for beef cattle. In ‘Proceedings of 10th World Conference on Animal Production’. Abs. 49. (World Association of Animal Production) p. 129. (Wageningen Academic Publishers: Wageningen, The Netherlands)

Defoor PJ, Galyean ML, Salyer GB, Nunnery GA, Parsons CH (2002) Effects of roughage source and concentration on intake and performance by finishing heifers. Journal of Animal Science 80, 1395–1404.
CAS | PubMed |
[Verified 26 November 2009].

Galyean ML, Defoor JP (2003) Effects of roughage source and level on intake by feedlot cattle. Journal of Animal Science 81, E8–E16. [Verified 26 November 2009].

Parra V , Rifle S , Elizalde JC (2006) ‘Estrategias de inclusión del corral en los sistemas ganaderos de la Argentina.’ (Balcarce)

Pordomingo AJ, Jonas O, Adra M, Juan NA, Azcárate MP (2002) Evaluación de dietas basadas en grano entero, sin fibra larga, para engorde de bovinos a corral. Revista de Investigaciones Agropecuarias 31, 1–22. [Verified 21 May 2010].

Van Soest PJ (1994) ‘Nutritional ecology of the ruminant.’ 2nd edn. (Cornell University Press: Ithaca, NY)