EFFECTS OF AN ABRUPT DIET CHANGE FROM HAY TO CONCENTRATE ON MICROBIAL NUMBERS AND PHYSICAL-ENVIRONMENT IN THE CECUM OF THE PONY
EFFECTS OF AN ABRUPT DIET CHANGE FROM HAY TO CONCENTRATE ON MICROBIAL NUMBERS AND PHYSICAL-ENVIRONMENT IN THE CECUM OF THE PONY
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DOI：
10.1128/aem.54.8.1946-1950.1988
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发表时间：
1988-08-01
影响因子：
4.4
通讯作者：
DEHORITY, BA
中科院分区：
文献类型：
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作者：
GOODSON, J;TYZNIK, WJ;DEHORITY, BA
在从全饲料饲料突然转变为全浓缩饲料（两者均以维持能量水平饲喂）期间，测量了小马盲肠中的微生物数量、pH值、液体体积和周转率。精料饲喂使厌氧细菌总数显著增加（P <0.01）。在选择性淀粉培养基上，饲喂精料后菌体数量显著增加（P <0.01），而在木聚糖和果胶培养基上菌体数量显著减少（P <0.025）。在饲料改为精料后的第7天，乳酸盐培养基上生长的细菌数量增加（P <0.01），随后逐渐下降。纤维素分解细菌的数量较少，范围为1.1 × 10 - 4~1.5 × 10 - 4。104至4.4 ×104/g盲肠内容物。全精料饲养使盲肠原虫属数和原虫总数均显著降低（P <0.01）。最低盲肠pH值为6.4和5.8时，饲料和浓缩物，分别喂，与最低pH值发生6 h后喂养。盲肠内容物的干物质百分比遵循昼夜模式，这是相反的pH曲线。在饲料喂养期间，盲肠平均含有2.2升（1.6至3.4升），每天翻转3.9次。当喂食浓缩物时，盲肠体积平均为3.9升（0.6至8.6升），平均液体周转为每天4.2次。与饲料从干草到精料的突然变化相关的小马盲肠中的微生物数量和pH值变化类似于在相似的饲养条件下发生在瘤胃中的微生物数量和pH值变化。
Microbial numbers, pH, fluid volume, and turnover rate in the pony cecum were measured during an abrupt change from an all-forage to an all-concentrate diet, both fed at maintenance energy levels. Concentrate feeding resulted in increased (P < 0.01) numbers of total viable anaerobic bacteria. The numbers of organisms growing on selective starch medium increased (P < 0.01) when concentrate was fed, while numbers on xylan and pectin media decreased (P < 0.025). Seven days after the diet change to concentrate, the number of bacteria growing on lactate medium increased (P < 0.01), followed by a gradual decline. Cellulolytic bacteria occurred in low numbers, ranging from 1.1 .times. 104 to 4.4 .times. 104 per g of cecal contents. Feeding all concentrate decreased both the number of genera (P < 0.01) and total protozoan numbers (P < 0.01) in the cecum. Minimum cecal pH values of 6.4 and 5.8 were obtained when forage and concentrate, respectively, were fed, with the minimum pH occurring 6 h postfeeding. Dry-matter percentage of cecal contents followed a diurnal pattern which was the inverse of the pH curve. During forage feeding, the cecum contained an average of 2.2 liters (1.6 to 3.4 liters), which turned over 3.9 times per day. When concentrate was fed, cecal volume averaged 3.9 liters (0.6 to 8.6 liters), with a mean liquid turnover of 4.2 times per day. Microbial numbers and pH changes in the pony cecum associated with an abrupt change in diet from hay to concentrate resembled those which occur in the rumen under similar feeding conditions.