日粮氮源与乳酸链球菌素对湖羊生产性能及养分消化率的影响
毕业论文关键词：日粮氮源；乳酸链球菌素；湖羊；生产性能；养分消化率
Effects of Nitrogen Source and Nisin on Growth Performance and Nutrient Digestibility of Hu Sheep
Abstract: The objective of this study was to investigate the effect of N source and nisin on the growth performance and nutrient digestibility of Hu sheep. Two N sources, soybean meal (SBM) and distillers dried grains with solubles (DDGS), and two levels of nisin, 0 and 30.5 mg of nisin/kg of diet, were used to formulate four isonitrogenous diets. Thirty-two male Hu lambs (23kg initial BW) were assigned to four dietary treatments in a randomized block design with a 2 × 2 factorial arrangement, with each dietary treatment having 8 lambs. Feeding trials were conducted for a period of 10 wks, consisting of 1 wk for adaptation followed by 9 wks of treatment. Results showed that the overall DMI, ADG and G:F were not influenced by N source (P > 0.05), but the growth performance of lambs fed with different N sources diet responded differently with time. In week 4, the DDGS-fed lambs had a trend to decrease BW relative to those fed SBM (P = 0.07), while the final BW did not differ between DDGS and SBM (P > 0.10). Compared with the SBM-fed lambs, DDGS-consuming lambs had lower DM, OM, and CP but higher ADF and EE digestibility (P < 0.05). Nisin supplementation did not affect growth performance and nutrient digestibility (P > 0.05). It was concluded that replacing soybean meal with DDGS as dietary nitrogen could reduce the production cost but not affect the performance of Hu sheep, and the addition of nisin had no effect on the performance and nutrient digestibility of Hu sheep.
Key words: Dietary nitrogen source; Nisin; Hu sheep; Growth performance; Nutrient digestibility
目 录
摘要 1
关键词 1
Abstract 1
Key words 2
引言 2
1 材料与方法 2
1.1 试验动物 2
1.2 试验材料 2
1.3 试验设计及日粮 2
1.4 样品采集与分析 3
1.5 统计分析 4
2. 结果与分析 4
2.1 乳酸链球菌素对湖羊生产性能和养分消化率的影响 4
2.2 日粮氮源对湖羊生产性能和养分消化率的影响 6
3 讨论 7
4 结论 7
致谢 8
参考文献： 8
日粮氮源与乳酸链球菌素对湖羊生产性能及养分消化率的影响