动物营养学报2019，Vol.31Issue(6)：2807-2815,9.DOI:10.3969/j.issn.1006⁃267x.2019.06.041
不同收获期对全株玉米青贮营养价值、发酵品质和瘤胃降解率的影响
Effects of Different Harvest Stages on Nutritional Value, Fermentation Quality and Rumen Degradability of Whole Corn Silage
摘要
Abstract
This experiment was conducted to evaluate the nutritional value, fermentation quality and rumen de?gradability of whole corn silage in different harvest stages. One hundred and thirty whole corn silage samples were collected from 130 farms located in 44 districts in Shandong province. According to the position of milk line of corn seeds at harvest, the samples were divided into three stages: 1/2 milk line, 2/3 milk line and 3/4 milk line, and the number of samples was 40, 60 and 30, respectively, and the nutritional value, fermentation quality and rumen degradability of whole corn silage were determined. The results were showed as follows: 1) with the harvest stage prolonged, the content of dry matter ( DM) in whole corn silage was significantly in?creased ( P＜0.05) , while the crude ash ( Ash) content was significantly decreased ( P＜0.05). The contents of neutral detergent fiber ( NDF) , acid detergent fiber ( ADF) and acid detergent lignin ( ADL) in whole corn si?lage in 1/2 milk line stage were significantly higher than those in 2/3 milk line stage and 3/4 milk line stage ( P＜0.05). 2) With the harvest stage prolonged, the content of starch ( CB1) in whole corn silage was signifi?cantly increased ( P＜0.05). The contents of total carbohydrates ( CHO) and soluble sugar ( CA) in whole corn silage in 1/2 milk line stage were significantly lower than those in 3/4 milk line stage ( P＜0.05) , and the contents of unusable fiber ( CC) and available neutral detergent fibers ( CB3) in whole corn silage in 1/2 milk line stage were significantly higher than those in 2/3 milk line stage and 3/4 milk line stage ( P＜0.05). 3) With the harvest stage prolonged, the fermentation coefficient and Fleig score of whole corn silage were signifi?cantly increased ( P＜0.05). The content of lactic acid in whole corn silage in 1/2 milk line stage and 2/3 milk line stage was significantly higher than that in 3/4 milk line stage ( P＜0.05) , and the content of propionic acid in whole corn silage in 1/2 milk line stage was significantly higher than that in 2/3 milk line stage and 3/4 milk line stage ( P＜0.05). 4) With the harvest stage prolonged, the total digestible nutrient ( TDN) content and di?gestive energy and metabolic energy in whole corn silage were significantly increased ( P＜0.05). The net ener?gy for maintenance, net energy for gain and net energy for lactating in whole corn silage in 1/2 milk line stage were significantly lower than those in 2/3 milk line stage and 3/4 milk line stage ( P＜0.05).5) The dry matter degradability of whole corn silage at 24 and 48 h in 1/2 milk line stage and 2/3 milk line stage was significantly lower than that in 3/4 milk line stage ( P＜0.05). In conclusion, the whole corn silage harvested at 3/4 milk line has the highest nutritional value and fermentation quality.[ Chinese Journal of Animal Nutrition, 2019, 31(6) :2807?2815]关键词
收获期/全株玉米青贮/营养价值/发酵品质Key words
harvest stage/whole corn silage/nutritional value/fermentation quality分类
农业科技引用本文复制引用
姜富贵,宋恩亮,成海建,刘栋,胡明,苏文政,安文娟,孔淑慧,王亚芳,刘方圆..不同收获期对全株玉米青贮营养价值、发酵品质和瘤胃降解率的影响[J].动物营养学报,2019,31(6):2807-2815,9.基金项目
现代农业(肉牛牦牛)产业技术体系专项资金( CARS⁃37) （肉牛牦牛）
国家自然科学基金( 31672450) （ 31672450）
农业技术试验示范与服务支持项目——山东省全株青贮玉米推广示范应用项目(131821301064072018⁃2) （131821301064072018⁃2）
山东省农业重大应用技术创新项目"青贮玉米高产高效生产技术集成与示范" （）
