李洪涛 1杨在宾 1杨维仁 1姜淑贞 1张桂国 1张庆 1张崇玉1
作者信息
- 1. 山东农业大学动物科技学院,山东泰安271018
- 折叠
摘要
Abstract
This experiment was conducted to study the effects of four types of diets:MLC(Maize-Leymus chinensis),WLC (wheat-Leymus chinensis),MSP (maize-sweet potato vine) and WSP (wheat-sweet potato vine) in Dorper sheep rumen fermentation.4 head similar weight (55.10 ± 1.24 kg),installed permanent rumen fistula health Dorper rams weve selected as experimental animals,Continuous phase 4 animal experiments,each experiment lasted for 18 days,the pre phase 12 d,test period d 6,The results show that adaptability test showed that after a sudden change of diet,the pH of maize groups recovered to the prior diet level at d 6,and the wheat recovered to the prior diet level in the d 7;The NH3-N concentration of the MLC group recovered to prior dietary replacement level in the 7 d,and the remaining three groups recovered at d 8.within 8 hours after Dorper sheep feeding,the pH value of the LC(Leymus chinensis) groups was significantly higher than that of the SP(sweet potato vine) groups(P＜0.05).From the rumen NH3-N concentration,the mean of the wheat groups was significantly higher than that of the maize groups (P＜0.05),the wheat groups were significantly higher than that of the maize groups within 6 hours after Dorper sheep feeding (P＜0.05).From the TVFA concentration,the difference between the groups was significant (P＜0.05),and there was interaction.The acetic acid concentrations of the wheat groups was significantly higher than that of the maize groups (P＜0.05),four groups of propionic acid,butyric acid and valeric acid concentrations,the SP groups were significantly higher than that of LC groups (P＜0.05);and isovaleric acid concentration of maize groups was significantly higher than that of wheat (P＜0.05).And from the ratio of acetic acid / propionate(A/P),the LC groups were significantly higher than thatof the SP groups (P＜0.05).It can be concluded that the wheat diets could obtain high concentration of NH3-N,but the maize diets could obtain higher acetic acid and isovaleric acid concentrations.The Leymus chinensis type diets could obtain higher ruminal pH and A/P ratios,but the SP diets could obtain higher propionic acid,butyric acid,valeric acid.The concentration of TVFA was influenced by the grain types and coarse fodder types.关键词
日粮类型/杜泊羊/瘤胃/pH/氨态氮/挥发性脂肪酸Key words
Diet types/Dorper sheep/Rumen/pH/NH3-N/VFA分类
农业科技
