Nutrient digestibility, rumen microbial protein synthesis, and growth performance in sheep consuming rations containing sea buckthorn pomace
Nutrient digestibility, rumen microbial protein synthesis, and growth performance in sheep consuming rations containing sea buckthorn pomace
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食用含有沙棘果渣的日粮的绵羊的营养物质消化率、瘤胃微生物蛋白质合成和生长性能
DOI：
10.1093/jas/sky201
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发表时间：
2018-08-01
影响因子：
3.3
通讯作者：
Zhang, Jianxin
中科院分区：
文献类型：
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作者：
Hao, Xiaoyan;Diao, Xiaogao;Zhang, Jianxin
本试验旨在研究在绵羊日粮中添加不同比例沙棘果渣（SBP）对营养物质消化率、瘤胃微生物蛋白质合成及生长性能的影响。选取体重为22.2 +/- 0.92 kg、年龄为120 +/- 11 d、平均+/- SD的杜伯× 1/2瘦尾汉族公羊45只，采用随机设计分为4组，随机分配4种处理饲粮。各组采用等氮配制不同收缩压水平的饲粮：1)0%收缩压（对照），2)7.8% DM收缩压（8SBP）， 3) 16.0% DM收缩压（16SBP）， 4) 23.5% DM收缩压（24SBP）。部分玉米和牧草用SBP代替。DMI和ADG呈线性增加（P = 0.001），但饲料效率不受SBP添加率的影响（P = 0.460）。随着收缩压包合量的增加，OM、NDF和ADF消化率呈线性降低（P = 0.005）， CP呈线性升高（P = 0.012）。估计微生物CP产率与SBP加入水平呈二次响应关系（P = 0.003），在中等SBP水平下最大。对于肠道可吸收的饲粮蛋白质，各处理之间存在二次效应（P = 0.029）。代谢蛋白（MP）供应随收缩压包涵率的增加呈线性增加（P < 0.0001）。结果表明，在羔羊日粮中添加SBP可提高羔羊的MP供应和平均日增重。然而，日粮中高含量的氨基酸不利于营养物质的消化率。本试验条件下，最佳配比为16.0%。
This experiment was conducted to investigate nutrient digestibility, rumen microbial protein synthesis, and growth performance when different proportions of sea buckthorn pomace (SBP) were included in the diet of sheep. A total of forty1/2 Dorper x 1/2 thin-tailed Han ram lambs (BW = 22.2 +/- 0.92 kg, age = 120 +/- 11 d; mean +/- SD) were selected and divided into four groups in a randomized design and were randomly allocated to one of four treatment diets. Diets were formulated isonitrogenously and contained different levels of SBP: 1) 0% SBP (control), 2) 7.8% of DM SBP (8SBP), 3) 16.0% of DM SBP (16SBP), and 4) 23.5% of DM SBP (24SBP). A portion of corn and forages were replaced with SBP. DMI and ADG increased linearly (P = 0.001), but feed efficiency was not affected (P = 0.460) by increasing SBP inclusion rate. As the SBP inclusion increased, OM, NDF, and ADF digestibility decreased linearly (P = 0.005) and that CP increased linearly (P = 0.012). Response to inclusion level of SBP was quadratic (P = 0.003) for the estimated microbial CP yield with the greatest at intermediate SBP levels. For intestinally absorbable dietary protein, quadratic (P = 0.029) effects were observed among treatments. The metabolizable protein (MP) supplies were linearly (P < 0.0001) improved with increasing SBP inclusion rate. The results indicated that SBP can be incorporated in the ration of ram lambs and improve MP supply and ADG. However, high content of it in the diet was adverse for nutrient digestibility. The optimal proportion was 16.0% under the condition of this experiment.