Voluntary food intake, live-weight gain, carcass quality and food conversion in contrasting genotypes of weaned suckler-bred bulls finished intensively on a cereal-based diet
- 1 February 2006
- journal article
- Published by Cambridge University Press (CUP) in Animal Science
- Vol. 82 (1), 117-124
- https://doi.org/10.1079/asc20054
Abstract
A bull beef finishing experiment was conducted with the objective of comparing physical performance of constrasting genotypes of suckler-bred bull beef animals finished intensively on a cereal-based diet at approximately 12 to 13 months of age. Nine bulls per genotype were drawn from weaned, bull calves born to one of two dam types (Belgian Blue×Holstein/Friesian (BB) or Simmental×Holstein/Friesian (SIM)) and which had been sired by one of two contrasting sire types (Aberdeen Angus (AA) or Charolais (CH)). Bull calves were weaned at approximately 8 months of age and the finishing experiment ran from approximately 9 months of age until slaughter at 12 to 13 months of age. Cereal-based concentrate diets were offered to all bulls on an ad libitum basis throughout the experimental finishing period. Dry matter intake (DMI), live-weight gain (LWG), food conversion ratio (FCR), and carcass slaughter characteristics were quantified.Average daily LWG was 2·07, 2·11, 2·34 and 2·65 kg/day, average FCR was 5·14, 5·06, 4·70 and 4·12 kg DMI per kg LWG and average age at slaughter was 387, 381, 374 and 366 days for the AA/BB, AA/SIM, CH/BB and CH/SIM bulls respectively. These figures showed that CH sired bulls grew faster ( PPPPPPP<0·05) than bulls from BB dams. No statistically significant differences in fat score (15-point scale) were seen between any of the breed combinations with fat scores of 7·50, 7·25, 6·75 and 6·75 for the AA/BB, AA/SIM, CH/BB and CH/SIM bulls respectively. No significant differences in average daily food intake were observed between breed combinations in the experiment with average daily DMI being 10·6, 10·6, 11·0 and 10·9 kg/day for AA/BB, AA/SIM, CH/BB and CH/SIM bulls respectively.Overall, there was little evidence to suggest that the rate of bull LWG declined to bring about any meaningful reduction in productivity as average bull live weight increased from approximately 9 months of age until slaughter at 12 to 13 months of age. When finished on a nutrient-rich, cereal-based concentrate diet, excellent animal performance and commercially acceptable carcasses can be produced from the UK suckler herd using genetically superior sires of either traditional UK or continental beef cattle breeds. Results from this study indicate that CH sired bulls out-performed AA sired bulls, especially when produced from SIM cows.Keywords
This publication has 9 references indexed in Scilit:
- Effects of the ratio of silage to concentrates in the diet on the performance and carcass composition of continental bullsAnimal Science, 2000
- A terminal sire selection index for UK beef cattleAnimal Science, 1998
- The effects of age at slaughter, genotype and finishing system on the biochemical properties, muscle fibre type characteristics and eating quality of bull beef from suckled calvesAnimal Science, 1998
- The effects of age at slaughter, genotype and finishing system on the organoleptic properties and texture of bull beef from suckled calvesAnimal Science, 1998
- Effects of pasture grazing or storage feeding and concentrate input between 5·5 and 11 months of age on the performance and carcass composition of bulls and on subsequent growth and carcass composition at 620 kg live weightAnimal Science, 1998
- Maize gluten and rapeseed meal as protein supplements to barley or wheat for intensively finished Charolais-cross bullsAnimal Science, 1995
- A comparison of pasture grazing and storage feeding, and the effects of sward surface height and concentrate supplementation from 5 to 10 months of age on the lifetime performance and carcass composition of bullsAnimal Science, 1994
- National estimates of the body composition of British cattle, sheep and pigs with special reference to trends in fatness. A reviewMeat Science, 1986
- Bull beef production from suckler herds of traditional breed typeAnimal Science, 1978