摘要
本试验旨在研究黑麦草酸性洗涤木质素/中性洗涤纤维(ADL/NDF)、长度对山羊采食行为及瘤胃液pH和纤维素酶活性的影响。选用4只体重(40.0±1.8)kg安装瘤胃瘘管的健康成年山羊作为试验动物,采用两因素4×4拉丁方设计,因素1为黑麦草ADL/NDF(低、高),因素2为黑麦草切割长度(20、5mm理论长度)。结果表明:1)盛花期黑麦草制成粗饲料8.00、1.18mm层的物理有效中性洗涤纤维(peNDF)显著高于初花期(P<0.05);增加黑麦草长度,显著提高制成的粗饲料>8.00mm层上的干物质(DM)含量及8.00、1.18mm层物理有效因子(pef)和peNDF(P<0.05),显著提高饲粮>8.00mm层上的DM含量及8.00mm层pef、peNDF(P<0.05)。2)增加黑麦草长度,显著降低山羊的干物质采食量(DMI)及采食时间,显著增加咀嚼和反刍时间(P<0.05);增加黑麦草ADL/NDF、长度均使山羊瘤胃液平均pH提高(P≤0.05)、pH<6.0的持续时间显著缩短(P<0.05)。3)高ADL/NDF黑麦草显著提高了山羊晨饲后12和16h瘤胃液微晶纤维素酶、4h水杨苷酶和8h木聚糖酶的活性(P<0.05);增加黑麦草长度,显著提高了山羊晨饲后8和16h的瘤胃液微晶纤维素酶、8h羟甲基纤维素酶和4h水杨苷酶的活性,但显著降低晨饲后16h羟甲基纤维素酶活性(P<0.05)。结果提示,增加黑麦草长度及ADL/NDF可显著改善采食行为及瘤胃液pH,显著降低DMI,显著提高采食后部分时间点的纤维素酶活性。
The experiment was conducted to study the effects of the ratio of acid detergent lignin to neutral detergent fiber（ADL/NDF） and length of ryegrass on eating behavior,ruminal pH and cellulases activity in goats.Four healthy rumen-cannulated adult goats with the body weight of（40.0±1.8） kg were selected as experimental animals in a two-factor 4×4 latin square design.Factor 1 was the ADL/NDF of ryegrass（low or high）,and factor 2 was the chopped length（theoretical length 20 or 5 mm） of ryegrass.The results showed as follows： 1） The physically effective NDF（peNDF） contents in 8.00 and 1.18 mm layers of the roughages made of ryegrass at full-bloom stage were significantly higher than that at early-bloom stage（P0.05）;with the increasing of ryegrass length,the contents of dry matter（DM） in the layers8.00 mm and physically effective factor（pef） and peNDF in 8.00 and 1.18 mm layers of the roughages,as well as the contents of DM in the layers8.00 mm and pef and peNDF in 8.00 mm layer of the diets were all significantly increased（P0.05）.2） With the increasing of ryegrass length,the dry matter intake（DMI） and foraging time significantly decreased,but the chewing and rumination time significantly increased（P0.05）;with the increasing of ryegrass ADL/NDF and length,the means of ruminal pH increased（P≤0.05）,and the duration time of pH6.0 significantly shortened（P0.05）.3） The activities of ruminal crystal cellulose hydrolytic enzyme at 12 and 16 h,salicin hydrolytic enzyme at 4 h and xylanase at 8 h after feeding in the morning were all significantly increased by high ADL/NDF of ryegrass（P0.05）;with the increasing of ryegrass length,the activities of the ruminal crystal cellulose hydrolytic enzyme at 8 and 16 h,CMC hydrolytic enzyme at 8 h and salicin hydrolytic enzyme at 4 h after feeding in the morning all significantly increased,but the CMC hydrolytic enzyme at 16 h after feeding significantly decreased（P0.05）.These results indicate that with the increasing of ADL/NDF and length of ryegrass,eating behaviour and ruminal pH can be significantly improved,and DMI can be significantly decreased and the activities of celluloses in rumen at some time points can be significantly increased.
出处
《动物营养学报》
CAS
CSCD
北大核心
2011年第7期1130-1139,共10页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
科技部国际科技合作与交流专项(2010DFB34230)
陕西省‘13115’科技创新工程工程技术研究中心(2010ZDGC-02)
陕西省科技创新工程重大科技专项(2009ZDKG-18)
陕西省农业攻关项目(2009K01-02)
