不同精粗比和苜蓿水平对饲粮组合效应的影响  

Effect of Concentrate-roughage Ratio and Alfalfa Supplementation on Associative Effects of Diets in vitro

作　　者：袁玖[1] 万欣杰 平丽莹 王军军 何天乐 俞海山 

机构地区：[1]甘肃农业大学动物科学技术学院,兰州730070 [2]兰州联邦饲料有限公司,兰州730060

出　　处：《畜牧兽医学报》2018年第2期449-458,共10页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：甘肃省科技厅自然基金B类项目(1610RJZA084);甘肃农业大学盛彤笙基金项目(GSAU-STS-1617)

摘　　要：旨在探讨不同精粗比小麦秸/氨化小麦秸基础日粮中苜蓿的补饲水平对饲粮组合效应的影响。本试验共设6个精粗比(Concentrate∶Roughage,C∶R)(70∶30、60∶40、50∶50、40∶60、30∶70、20∶80)和4个苜蓿水平(Alfalfa)(0%、10%、20%、30%)。小麦秸/氨化小麦秸与苜蓿干草为粗饲料部分。采用体外产气法测定不同精粗比下48个饲粮组合(24个小麦秸组和24个氨化小麦秸组)和4种饲料分别培养2、4、6、9、12、24、36、48、72、96h的产气量,并通过24h产气量和各组合的加权估算值计算出饲粮组合效应值。结果表明:1)在小麦秸基础日粮中各组合的组合效应值,C∶R为70∶30时,20%苜蓿组极显著高于30%、10%、0组(P<0.01),30%苜蓿组极显著高于10%、0组(P<0.01),10%苜蓿组极显著高于0组(P<0.01);C∶R为50∶50时,30%苜蓿组极显著高于10%组(P<0.01),显著高于0组(P<0.05);C∶R为40∶60时,30%苜蓿组极显著高于0组(P<0.01),10%、20%苜蓿组显著高于0组(P<0.05)。2)在氨化小麦秸基础日粮中各组合的组合效应值,C∶R为70∶30时,30%、10%苜蓿组显著高于0组(P<0.05);C∶R为60∶40时,10%苜蓿组显著高于30%组(P<0.05);C∶R为50∶50时,10%、20%、0苜蓿组极显著高于30%组(P<0.01);C∶R为40∶60时,0苜蓿组显著高于20%组(P<0.05)。结果显示,氨化小麦秸基础日粮比小麦秸基础日粮补饲更少比例的苜蓿(前者为10%,后者为30%与20%)就可以达到正组合效应,有利于节约优质苜蓿干草资源。This experiment was conducted to investigate the effects of wheat straw（WS）or ammonium bicarbonate treated wheat straw（ABWS）basal diets supplemented with different levels of alfalfa on associative effects（AE）in vitro.There were 6 concentrate-roughage ratio（70∶30,60∶40,50∶50,40∶60,30∶70,20∶80）and 4 alfalfa supplementation levels（0%,10%,20%,30%）in this study.Roughage contained WS/ABWS and alfalfa.Gas production（GP）of48 feed combination groups（24 groups of WS and 24 groups of ABWS）and 4 diets was recorded at 2,4,6,9,12,24,36,48,72,96 hfor culture.The AE values were calculated by in vitro GP during 24 hand weighted values of different combinations.The results showed as follows：1）In WS basal diet,the AE of 20% group was significantly higher than that of 30%,10% and 0 groups（P〈0.01）,the AE of 30% group was significantly higher than that of 10%and 0 groups（P〈0.01）,the AE of 10% group was significantly higher than that of 0 group（P〈0.01）whenC∶R was 70∶30.The AE of 30% group was significantly higher than that of 10% group（P〈0.01）and 0 group（P〈0.05）when C∶R was 50∶50.The AE of 30% group was significantly higher than that of 0 group（P〈0.01）,and the AE of 10% and 20% groups were significantly higher than that of 0 group（P〈0.05）when C∶R was 40∶60.2）In ABWS basal diet,the AE of 30% and 10% groups were significantly higher than that of 0 group（P〈0.05）when C∶R was 70∶30,the AE of 10% group was significantly higher than that of 30% group（P〈0.05）when C∶R was 60∶40,the AE of 10%,20%and 0 groups were significantly higher than that of30% group（P〈0.01）when C∶R was 50∶50,the AE of 0 group was significantly higher than that of 20% group（P〈0.05）when C∶R was 40∶60.It is concluded that ABWS diet need less alfalfa（10%）than WS（30%,20%）diet to develop positive AE.ABWS is better than WS in reduing the supplement of alfalfa.

关 键 词：组合效应 苜蓿 精粗比 小麦秸 氨化小麦秸 

分 类 号：S816.8[农业科学—饲料科学]