calves;
effect of age;
digestibility of organic nutrients;
nitrogen retention;
D O I:
暂无
中图分类号:
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号:
0905 ;
摘要:
Apparent digestibility of organic nutrients and nitrogen retention were studied in 23 three-day balance periods with five male calves of Czech Red Pied breed at the age of 9 to 91 days. Animals were fed on milk replacer ad semi-libitum. The digestibility and nitrogen retention were determined using the chromic oxide indicator method. The average values of digestibility were as follows: crude protein (CP) 0.642 +/- 0.0162, crude fat(CF) 0.776 +/- 0.0104, nitrogen-free extract (NFE) 0.940 +/- 0.0027. Digestibility of nutrients under study changed highly significantly (P < 0.01) with the age of calves. The dependence of determined values on age was expressed by the 2nd degree parabola equations with the maximum values on Days 62, 67 and 74 for CF, NFE and CP, respectively. The most marked increase was observed in the first weeks of experiment. Percentage of nitrogen retention changed highly significantly (P < 0.01) with age and the dependences expressed by the concave parabola equation achieved their maxima on Days 81 and 63 for nitrogen consumed and digested, respectively.
机构:
Feed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of AgricultureFeed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of Agriculture
MA Tao
论文数: 引用数:
h-index:
机构:
TU Yan
ZHANG Nai-feng
论文数: 0引用数: 0
h-index: 0
机构:
Feed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of AgricultureFeed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of Agriculture
ZHANG Nai-feng
GUO Jiang-peng
论文数: 0引用数: 0
h-index: 0
机构:
Beijing General Station of Animal HusbandryFeed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of Agriculture
GUO Jiang-peng
DENG Kai-dong
论文数: 0引用数: 0
h-index: 0
机构:
Feed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of AgricultureFeed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of Agriculture
DENG Kai-dong
ZHOU Yi
论文数: 0引用数: 0
h-index: 0
机构:
Feed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of AgricultureFeed Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Feed Biotechnology,Ministry of Agriculture