摘要
本试验旨在研究不同遗传基础肉牛在2种营养水平下对日粮养分消化率的差异。采用4×2双因子试验设计,选取月龄相近、发育正常、健康无病的夏洛莱牛♂×西杂牛♀杂交的后代(夏西杂牛)、德国黄牛♂×西杂牛♀杂交的后代(德西杂牛)、红安格斯牛♂×西杂牛♀杂交的后代(安西杂牛)和利木赞牛♂×西杂牛♀杂交的后代(利西杂牛)各12头,每个遗传基础肉牛分别饲喂2种营养水平日粮,采用内源指示剂法进行为期7d的消化试验。结果表明:①从遗传基础上看,德西杂牛对粗蛋白质的消化率显著高于安西杂牛(P<0.05),极显著高于利西杂牛(P<0.01),对粗脂肪的消化率极显著高于夏西杂牛和安西杂牛(P<0.01);②从营养水平上看,饲喂高营养水平日粮的肉牛对各种营养物质消化率均极显著高于饲喂低营养水平日粮的肉牛(P<0.01);③从遗传基础与营养水平互作上看,夏西杂牛、安西杂牛和利西杂牛对日粮中各种营养物质消化率随营养水平的提高而提高,德西杂牛对日粮中各种营养物质消化率随营养水平的提高而下降。提示,遗传基础对粗蛋白质和粗脂肪的消化率有显著影响(P<0.05);营养水平对日粮中干物质、有机物、粗蛋白质、粗纤维、粗灰分和粗脂肪的消化率都存在显著影响(P<0.05);遗传基础与营养水平在粗蛋白质消化率上存在显著的互作效应(P<0.05)。
The experiment aimed to study the difference on the dietary nutrient digestibility of different genetic basis beef cattle during two nutrient levels. Forty-eight heads of different genetic basis beef cattle （Charolais × Simmental-erossbred cattle, GelbviehXSimmental-crossbred cattle, Angus× Simmental-crossbred cattle and Limousin × Simmental-crossbred cattle） were introduced, feeding two different nutritional level of diets,adopting 4× 2 two factor design,and carrying on the seven days of di- gestion experiment using endogeny indicator method. The results showed as follows;①From genetic basis, crude protein digesti- bility in Gelbvieh× Simmental-crossbred cattle was significantly higher than that in Angus× Simmental-crossbred cattle （P〈 0.05） ,and extremely significantly higher than that in Limousin×Simmental-crossbred cattle（P〈0.01）, crude fat digestibility in Gelbvieh× Simmental-crossbred cattle was extremely significantly higher than that in Charolais × Simmental-crossbred cattle and Angus ×Simmental-crossbred cattle （P〈0.01）. ② From nutritional level, the nutrient digestibility of beef cattle in feeding a high nutrition diet were extremely significantly higher than that in feeding a low nutrition diet （P〈0.01）. ③From the interac- tion of genetic basis and nutritional level,nutrient digestibility decreased with the increase of nutritional level of diet in Charolais × Simmental-crossbred cattle, Angus × Simmental-crossbred cattle and Limousin ×Simmental-crossbred cattle, while Gelbvieh × Simmental-crossbred cattle were on the contrary. The results indicated that genetic basis had significant influences on crude pro- tein digestibility and crude fat digestibility （P〈0.05）, nutritional level of diet had significant influences on the digestibility of dry matter,organic matter, crude protein,crude fiber, crude ash and crude fat （P〈0.05）, crude protein digestibility were influ- enced significantly by genetic basis and nutritional level of diet at the same time （P〈0.05）.
出处
《中国畜牧兽医》
CAS
北大核心
2014年第2期101-105,共5页
China Animal Husbandry & Veterinary Medicine
基金
国家肉牛牦牛产业技术体系(CARS-38)
关键词
遗传基础
营养水平
互作
消化率
genetic basis
nutritional level
interaction
digestibility
