Intake and Apparent Absorption of Calcium, Phosphorus, Sodium, Potassium and Magnesium of Calves Fed Diets with Different Levels of Roughage

Revista Brasileira de Zootecnia

Signoretti, Ricardo Dias³  Turco, Silvia Helena Nogueira³  Silva, José Fernando Coelho da⁴  Campos, Oriel Fajardo de¹  Valadares Filho, Sebastião de Campos⁴  Araújo, Gherman Garcia Leal de² 

[1] Embrapa Semi-Árido, Petrolina;Embrapa Gado de Leite;Universidade Federal de Viçosa

关键词: apparent absorption;    calves;    calcium;    feed intake;    magnesium;    phosphorus;    potassium;    roughage;    sodium     IntroduçãoA quantidade de cálcio absorvido no aparelho digestivo depende;    além da disponibilidade do elemento no alimento;    da exigência e da quantidade ingerida;   

DOI  :  10.1590/S1516-35982001000700020

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The effects of different levels of roughage on intake and apparent absorption of calcium (Ca), phosphorus (P), sodium (Na), potassium (K) and magnesium (Mg) were studied. Forty Holstein x Zebu calves, with initial average live weight of 60 kg, allotted to a completely randomized design, were fed concentrate and chopped coastcross (Cynodon dactylon) grass hay ad libitum in the following levels: 10; 25; 40; 55 e 90%, on a DM basis. The coefficients of apparent absorption were obtained by one experiment with two experimental periods of digestibility, accomplished at 120 and 180 days of age of the animals. The fecal dry matter excretion was estimated with chromium oxide. The intakes of Ca, P, Mg, Na and K in (g/day) showed a quadratic effect and the respective maximum intakes were estimated for 47.0, 30.0, 45.3, 41.0 and 51.8 % of roughage in the diet. The apparent absorption coefficients of Ca, P and K were affected by the level of roughage, showing a quadratic effect, with the respective maximum absorptions of 58.7, 56.1 and 78.3% for the levels of 20.3, 23.1 and 45.2 % of hay in the diet.

【 授权许可】

CC BY-NC