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Phase-feeding to optimize performance and quality of Belgian Blue double-muscled bulls

Published online by Cambridge University Press:  18 August 2016

S. de Campeneere
Affiliation:
Department Animal Nutrition and Husbandry, Agricultural Research Centre, Ghent, Scheideweg 68, B-9090 Melle-Gontrode, Belgium
L. O. Fiems
Affiliation:
Department Animal Nutrition and Husbandry, Agricultural Research Centre, Ghent, Scheideweg 68, B-9090 Melle-Gontrode, Belgium
B. G. Cottyn
Affiliation:
Department Animal Nutrition and Husbandry, Agricultural Research Centre, Ghent, Scheideweg 68, B-9090 Melle-Gontrode, Belgium
Ch.V. Boucqué
Affiliation:
Department Animal Nutrition and Husbandry, Agricultural Research Centre, Ghent, Scheideweg 68, B-9090 Melle-Gontrode, Belgium
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Abstract

To optimize performance and carcass quality of Belgian Blue double-muscled bulls four phased feeding regimens were evaluated. All diets were offered ad libitum and consisted of 650 g concentrates and 350 g maize silage per kg dry matter (DM). Total period was divided into three phases (ca. 360 to 460, 460 to 570 and 570 to 680 kg). All four groups received the same maize silage but the different energy and protein densities were applied using different concentrates. During the three phases, the negative control (NC) group constantly received a diet with a low protein and a moderate energy density; the second group (DP) received with each phase diets with decreasing protein density while the energy density remained moderate; the third group (IE) received diets with increasing energy density at a constantly high protein density and the last group (DPIE) received diets which decreased in protein and increased in energy density.

The NC group grew significantly slower during the first interval (1·37 v. 1·62 kg/day for the other groups), resulting in a significantly longer total finishing period. During the third period IE had the slowest growth. The NC group needed 21 and 20 days more than the DP and DPIE groups, respectively, to reach the same slaughter weight. The NC group had the lowest DM intake during the first interval, the IE group during the third interval. No significant differences (P > 0·05) were found for food conversion, when expressed as DM or NEF (net energy for fattening). IE had the worst protein conversion while NC had the best, with the two other groups being intermediate.

The only important significant difference concerning carcass quality was the improved dressing proportion of the IE and DP groups. Although significant, differences in the fat content of the m. longissimus thoracis are of minor importance. These results proved that for Belgian Blue double-muscled bulls, protein density of the diet can be decreased with increasing live weight, while energy should be increased to give optimal performance.

Type
Research Article
Copyright
Copyright © British Society of Animal Science 1999

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