Hatungimana Eric, Stahl Tess C, Erickson Peter S
Department of Agriculture, Nutrition and Food Systems, University of New Hampshire, Durham, NH.
Transl Anim Sci. 2020 Jun 9;4(3):txaa079. doi: 10.1093/tas/txaa079. eCollection 2020 Jul.
The objective of this study was to evaluate the growth performance and apparent total tract nutrient digestibility of Holstein heifers limit-fed diets containing different amounts of wet brewer's grains (WBG). A 12-wk randomized complete block study was conducted using 30 yearling Holstein heifers [378 ± 27 d of age, and body weight (BW) of 357.8 ± 27.6 kg (mean ± SD)]. Treatments were 0%, 10% and 20% of WBG on a dry matter (DM) basis and diets were formulated to be limit-fed for dry matter intake (DMI) at 2.35% of BW and provided 15% crude protein (CP) and 2.27 Mcal metabolizable energy/kg of DM. Dry matter intake was recorded daily, while BW and skeletal measurements were measured every 2 wk. During week 12, fecal samples were collected directly from the rectum over four consecutive days and composited by heifer to determine apparent total tract nutrient digestibility using acid detergent insoluble ash as a marker. Data were analyzed using the MIXED procedure of SAS. Dry matter intakes, BW, and average daily gain were not different among treatments ( = 0.2, = 0.4, and = 0.6, respectively). Dry matter intakes ranged from 8.6 to 9.0 kg/d. Average BW were 404.4, 411.5, and 409.3 kg for heifers fed the 0%, 10%, and 20% WBG diets, respectively. Average daily gains were 1.03, 1.04, and 0.96 kg/d for heifers fed the 0%, 10%, and 20% WBG diets respectively. Skeletal measurements and body condition scores (BCS) were not different among treatments except for the change in heart girth ( < 0.01) and initial BCS ( < 0.01). Apparent total tract digestibilities of DM, organic matter, CP, fat, and hemicellulose were greater or tended to be greater in heifers fed 0% and 20% WBG treatments than heifers fed 10 % WBG ( = 0.04, = 0.04, = 0.06, = 0.06, and = 0.01, respectively). Neutral detergent fiber, acid detergent fiber, and fat digestibilities were similar among treatments ( = 0.2, = 0.3, and = 0.3, respectively). During the digestibility phase, DMI tended to be greater ( = 0.08) for the 10% WBG treatment. These results demonstrate that limit-feeding heifers with diets containing up to 20% WBG could replace soybean- and corn-based concentrates in diets without adverse consequences to the heifer growth performance.
本研究的目的是评估限饲含有不同量湿酒糟（WBG）的日粮对荷斯坦小母牛生长性能和表观全肠道养分消化率的影响。采用30头一岁龄荷斯坦小母牛[年龄378±27天，体重（BW）357.8±27.6千克（均值±标准差）]进行了一项为期12周的随机完全区组研究。处理方式为基于干物质（DM）的0%、10%和20%的WBG，日粮配方为按体重的2.35%限饲干物质摄入量（DMI），并提供15%的粗蛋白（CP）和2.27兆卡代谢能/千克DM。每天记录干物质摄入量，每2周测量体重和骨骼尺寸。在第12周期间，连续四天直接从直肠采集粪便样本，并按小母牛进行混合，以酸性洗涤不溶性灰分为标记物测定表观全肠道养分消化率。使用SAS的MIXED程序分析数据。各处理间的干物质摄入量、体重和平均日增重无差异（分别为P = 0.2、P = 0.4和P = 0.6）。干物质摄入量范围为8.6至9.0千克/天。饲喂0%、10%和20%WBG日粮的小母牛平均体重分别为404.4、411.5和409.3千克。饲喂0%、10%和20%WBG日粮的小母牛平均日增重分别为1.03、1.04和0.96千克/天。除胸围变化（P < 0.01）和初始体况评分（P < 0.01）外，各处理间的骨骼测量和体况评分（BCS）无差异。饲喂0%和20%WBG处理的小母牛的DM、有机物、CP、脂肪和半纤维素的表观全肠道消化率高于或趋于高于饲喂10%WBG的小母牛（分别为P = 0.04、P = 0.04、P = 0.06、P =
