Effect of Feed Intake Characteristic on Growth Performance in Luyu-Duroc and Yorkshire

[ Objective] To study the effect of feed intake characteristic on growth performance in Luyu - Duroc and Yorkshire. [ Method] 89 Luyu - Yorkshire and 82 Luyu -Duroc were chosed and fed in the automatic determination system for swine production, 24h real-time monitoring feed in- take traits and growth performance, [ Result] It showed that： as feed intake increased, average daily gain （ADG） and weight of 4 months were en- hanced, days on test, feed conversion ratio （FCR） and age-corrected of weight at 100 kg were reduced, feed intake positively regulated growth performance of Luyu -Doroc and Yorkshire. Feed intake significantly impacted ADG and days on test （P 〈0.01 ）, notably affected age-corrected of weight at 100 kg of Luyu - Duroc and FCR of Luyu - Yorkshire （ P〈 0.05）, variation tendency of feed frequency was consistent with feed intake and feed time, and the correlation was significant. [ Conclusion] The correlation between feed intake traits and growth performance was mainly caused by feed intake, ADG and FCR, however, predictability of feed intake was stronger than ADG and FCR, so in the actual selection feed intake was increased in pig breeding, thus at the same time to enhance ADG and to reduce FCR.

微生物菌剂对猪粪堆肥中细菌群落结构的影响

以猪粪和小麦秸秆做堆肥试验,处理组添加外源微生物菌剂,利用常规方法对堆肥样品进行理化性状测定,采用高通量测序技术分析堆肥过程中细菌群落特征。理化性状测定结果表明:添加外源菌剂可延长堆肥高温时间,降低堆肥发酵末期的pH,增加全氮含量,加快C/N的下降。主成分分析表明:外源菌剂影响堆肥样品细菌群落的稳定性。门分类水平上,厚壁菌门、变形菌门和绿弯菌门的相对丰度在处理组中较高;纲分类水平上,梭状芽孢杆菌纲、α-变形菌纲和γ-变形菌纲在处理组的升温期和高温期相对丰度增加;科分类水平上,小单孢菌科和梭状芽孢杆菌纲的消化链球菌科、梭菌科以及盐厌氧菌科的相对丰度在处理组的升温期和高温期均呈上升趋势。Pearson相关性分析表明,盐胞菌属与外源菌剂呈显著正相关,而氨苄芽孢杆菌属与外源菌剂呈显著负相关。研究表明,猪粪堆肥中添加外源菌剂可使堆肥的理化性质和细菌群落结构均发生显著变化。