EFFECTS OF CONCENTRATION OF DIETARY PHOSPHORUS ON AMOUNT AND ROUTE OF EXCRETION

被引:132
作者
MORSE, D [1 ]
HEAD, HH [1 ]
WILCOX, CJ [1 ]
VANHORN, HH [1 ]
HISSEM, CD [1 ]
HARRIS, B [1 ]
机构
[1] UNIV FLORIDA,DEPT DAIRY SCI,GAINESVILLE,FL 32611
关键词
LACTATION; PHOSPHORUS; EXCRETION; DIGESTIBILITY;
D O I
10.3168/jds.S0022-0302(92)78067-9
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Objectives were to determine the effect of dietary concentration of P in DM on routes of excretion of P and to evaluate direct and indirect measures of calculating DM digestibility and P excretion. Twelve lactating Holstein cows were fed 20 kg of DM containing .41% P daily for 4 wk and then were assigned randomly to one of three diets: low (.30%), medium (.41%), or high (.56%) in P for 9 wk. Total collections of excreta (feces and urine) and milk were made during wk 4, 7, 10, and 13. At wk 4, cows excreted 88.2% of P consumed daily: 68.6% of excreted P in feces, 1.0% in urine, and 30.3% secreted in milk. Cows assigned to the low P diet decreased intake by 26.8% and excretion of P in feces by 22.7% in wk 13 compared with wk 4, whereas cows fed the high P diet increased intake by 36.5% and excretion of P in feces by 48.6%. Digestibility of DM was 62.6% when calculated from total collection of feces but only 55.7 or 56.5% when estimated indirectly using Cr or acid detergent lignin as indigestible markers. Apparent excretion of P was less than that estimated using either of the marker techniques (49.7 vs. 59.1 and 58.1 +/- .7 g/d of P) because digestibility of DM was underestimated. A prediction equation was developed for P excretion based on P intake and milk production.
引用
收藏
页码:3039 / 3049
页数:11
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