Reducing calcium and phosphorus in crossbred beef cattle diets: impacts on productive performance during the growing and finishing phase

被引:15
|
作者
Prados, L. F. [1 ]
Valadares Filho, S. C. [1 ]
Santos, S. A. [1 ]
Zanetti, D. [1 ]
Nunes, A. N. [1 ]
Costa, D. R. [1 ]
Mariz, L. D. S. [1 ]
Detmann, E. [1 ]
Amaral, P. M. [1 ]
Rodrigues, F. C. [1 ]
Valadares, R. F. D. [2 ]
机构
[1] Univ Fed Vicosa, Dept Anim Sci, BR-36570000 Vicosa, MG, Brazil
[2] Univ Fed Vicosa, Dept Vet Med, BR-36570000 Vicosa, MG, Brazil
关键词
absorption coefficients; average day gain; mineral requirements; SITE;
D O I
10.1071/AN14781
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Forty 3/4 Bos indicus x 1/4 Bos taurus bulls (initial bodyweight = 214 +/- 4 kg; 11 +/- 0.2 months) were used in the study. Four bulls were slaughtered as reference and the other 36 bulls were allowed ad libitum consumption of treatment diets following a completely randomised 3 x 3 factorial design. The design included three diet concentrations of calcium (Ca) and phosphorus (P): standard, 50% of standard, and 75% of standard and three periods of feedlot confinement: 8, 16, and 24 weeks with four bulls per treatment combination. The diets were isonitrogenous and consisted of 60:40 corn silage to concentrate. Dry matter intake, crude protein, ether extract, organic matter, non-fibrous carbohydrates, Ca, and P, expressed as kg/day, were greater (P < 0.05) for bulls confined for longer periods. Nutrient digestibility and average daily gain was not affected (P > 0.05) by Ca and P concentration of diet or by feedlot phase. Dressing were decreased (P < 0.05) for bulls that remained in confinement for a shorter period. The daily maintenance requirements of Ca and P were 13.66 and 21.51 mg/kg empty bodyweight, respectively, and the absorption coefficients of Ca and P were 0.70 and 0.67, respectively. We concluded that for crossbred cattle in the feedlot, dietary levels of Ca and P recommended by BR-CORTE (2010), NRC (2000), and AFRC (1991) could be reduced by 62%, 66%, and 57%, respectively, for Ca and by 14%, 15%, and 43%, respectively, for P with significant savings in costs. This study shows that Ca and P can be reduced to 1.8 and 2.2 g/kg DM respectively, in the diets for crossbred cattle in feedlot.
引用
收藏
页码:1643 / 1649
页数:7
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