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Effect of quantity of concentrate feed on fattening young bulls on corn silage prepared at final stage of wax ripeness

P"rvanova V.I.; Todorov, N.A.; Ribarski, S.

Zhivotnov"dni Nauki 24(4): 3-11

1987


Accession: 005265763

Three groups of 15 young bulls each (Bulgarian Red cattle .times. Black and White cattle) crosses were fed ad libidum during the 4 to 7 month age period (130-480 kg live weight) high quality corn silage. Moreover, up to 200 kg live weight the animals received 1.5 kg alfalfa hay. For balancing the diet it was supplemented with sunflower meal, minerals and vitamins. Hereat young bulls of group 1 received no grain, those of group 2 received additionally 1 kg concentrate feed daily (860 corn + 160 g wheat bran) and of group 3-2 kg concentrate feed (1900 g corn + 140 g wheat bran). The average daily dry matter intake by the animals of group 1, group 2 and group 3 was 6.4, 6.6 and 7.0 kg; of feed units (1 FU = 0.6 kg starch equivalents) 6.31, 6.74 and 7.56; of corn silage dry matter 5.50, 4.67 and 4.27 kg. Organic matter digestibility was 63.3, 64.0 and 66.2%; the average daily gain 876 g, 927 g and 925 g; feed to gain ratio on dry matter basis 7.35 kg, 7.07 kg and 7.56 kg, and feed units to gain ratio 7.20, 7.27 and 8.17; and fat content of animal carcass 11.4, 12.7 and 12.6%, respectively. It was found that a kilogram of grain dry matter reduced silage dry matter consumption by ca. 0.7 kg. Inclusion of grain feeds in corn silage diet depressed nutrient digestibility mainly of nitrogen-free extract. This occurrence on its part lowered the effect of grain intake. On increasing the amount of grain in the diet a trend was observed towards deposition of more fat in animal carcass.

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