Protein sources in suplements to bovines on pastur in the dry and transition between the dry and the rainy periods
Abstract
Supplements with different protein sources were evaluated during the dry season and between the dry and the rainy seasons. We used 20 animals, with 220 kg average body weight and 10 months old age, in five paddocks (2 ha), in a completely randomized design, with five treatments and four replicates. The supplements with 38% of crude protein (CP) in the dry matter (DM) basis were supplied daily at 0.5% of their weight. The treatments employed were supplements based on: soybean meal /wheat meal (SMWM), wheat meal/urea (WMUR), cottonseed meal 38% of CP (CM38), cottonseed meal 28% of CP/urea (CMU28), wheat meal, cottonseed meal 38% of CP/urea (WCMU), and mineral salt was present in all the supplements. The treatment CM38 allowed superior animal performance compared with the treatments SMWM, WMUR and CM28; the treatment WCMU was superior to the treatments WMUR and CM28. We also used five Holstein-zebu steers, 10 months old and initial weight of 170 kg, fistulated in the esophagus and rumen. These animals were grazing in five paddocks (0.3 ha) each in a completely randomized design. The intake of neutral detergent fiber (NDF) was superior in treatments of WMU and CM28 in relation to CM38 and WCMU; and the digestibility of DM obtained in SMWM and WMUR treatments were superior to those of CM38, CM28, and WCMU, and the digestibility of CP’s WMU was superior to those of CM38 and CM28.Downloads
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Published
2009-06-30
Issue
Section
Animal Nutrition
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Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons