动物营养学报2011，Vol.23Issue(4)：589-596,8.DOI:10.3969/j.issn.1006-267x.2011.04.009
饲粮磷水平对西门塔尔杂交后备母牛营养物质表观消化率的影响
Effects of Dietary Phosphorus Levels on Apparent Digestibility of Nutrients in Simmental Crossbreed Replacement Heifers
摘要
Abstract
The aim of this study was to evaluate the effects of dietary phosphorus (P) level on apparent digestibility of nutrients in replacement heifers. Twenty-four healthy crossbreed heifers (Simmental × Chinese yellow cattle) with the body weight of (369.5 ±37.8) kg were selected and randomly assigned to six groups with four heads per group. The experiment groups were fed concentrations in equal amounts (3.50 kg/d) with six levels of P, which were 0.38％, 0.45％, 0.50％, 0.56％, 0.61％ and 0.67％ ( dry matter basis), respectively, and the roughage was ad libitum. The experiment lasted for 30 days, which were divided into a 20day preliminary trial period and a 10-day trial period. Feed and feces samples were collected during the last 7 days of trial period. The samples were tested for the contents of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), P and starch. The results showed as follows: the P level of concentrate had no significant influence on the feed intake of DM, CP, NDF and ADF ( P ＞ 0.05 );the P intake increased as the increasing of P level of concentration, and the values of group 1, 2, 3, 4 and 5 were 0.37％, 0.41％, 0. 44％, 0.47％, 0.50％ and 0.54％, respectively, among which the difference were significant except group4 and 5 ( P ＜ 0.05); the levels of concentrate P had no significant influence on DM, starch and CP apparent digestibility ( P ＜ 0.05 ); the NDF and ADF apparent digestibility of group 5 were the highest. The results indicate that 0.37％ of P level can satisfy the P need of replacement heifers, and 0.50％ dietary P is optimum for NDF and ADF digestion in replacement heifers. [Chinese Journal of Animal Nutrition ,2011,23 (4) :589-596]关键词
磷/营养物质/表观消化率/后备母牛Key words
phosphorus/ nutrients/ apparent digestibility/ replacement heifers分类
农业科技引用本文复制引用
许建海,张微,黄洁,姜军,孙长勉,莫放..饲粮磷水平对西门塔尔杂交后备母牛营养物质表观消化率的影响[J].动物营养学报,2011,23(4):589-596,8.基金项目
公益性行业(农业)科研专项(nyhyzx07-035) （农业）
国家肉牛产业技术体系项目(ngcytx-38) （ngcytx-38）
