Department of Animal Science and Technology, State University of Montes Claros, Avenue Reinaldo Viana, Janaúba, Minas Gerais, 2630, Brazil.
INCT- Animal Science Member, Brasília, Brazil.
Trop Anim Health Prod. 2021 Jan 7;53(1):99. doi: 10.1007/s11250-020-02503-3.
The objective of this study was to evaluate the replacement of forage sorghum silage (FS silage) with BRS 716 biomass sorghum silage (BRS 716 silage) in diet of F1 ½ Holstein × ½ Zebu cows on their nutrient intake and digestibility, ingestive behavior, nitrogen balance, and milk yield and composition. The experimental design was in two 5 × 5 Latin squares, simultaneous, composed, each, by five animals, five treatments, and five experimental periods. The study included 10 cows with an initial body weight (BW) of 544 ± 12.84 and 88 ± 14 days of lactation at the beginning of the experiment. The treatments were defined by replacement FS silage at levels 0, 25, 50, 75, and 100% with BRS 716 silage. The roughage:concentrate ratio in the total dry matter (DM) of the diets was 75:25. The replacement of FS silage with BRS 716 silage reduced (p < 0.01) the dry matter intake and digestibility of dry matter, but it had not changed average milk yield (12.68 kg/day; p = 0.94), feed efficiency, body weight, the score of body condition, and the average daily gain of the cows. The milk composition was not changed except casein/total protein in milk that decreased and that increased linearly milk urea nitrogen. The inclusion of BRS 716 silage increased the activities of rumination and chewing and decreased the periods of feeding and idleness. The replacement of up to 100% of FS silage with BRS 716 silage in the diet of F1 Holstein × Zebu cows does not alter average milk yield, despite changing diet intake and digestibility.
本研究旨在评估在 F1 半荷斯坦牛×半娟姗牛的饲粮中用 BRS716 生物质高粱青贮（BRS716 青贮）替代饲用高粱青贮（FS 青贮）对其养分摄入和消化率、采食行为、氮平衡以及产奶量和组成的影响。实验设计采用 2 个 5×5 拉丁方，同时设计，每个拉丁方由 5 头动物、5 种处理和 5 个试验期组成。该研究共包括 10 头奶牛，试验开始时初始体重（BW）为 544±12.84kg，泌乳天数为 88±14 天。处理方法是用 BRS716 青贮替代 FS 青贮，替代水平分别为 0、25、50、75 和 100%。饲粮干物质（DM）中粗饲料与精料的比例为 75:25。用 BRS716 青贮替代 FS 青贮降低了（p<0.01）奶牛的干物质摄入量和干物质消化率，但并未改变平均产奶量（12.68kg/天；p=0.94）、饲料效率、体重、体况评分和奶牛的平均日增重。除了牛奶中乳蛋白/总蛋白的比例降低以及牛奶尿素氮呈线性增加外，牛奶成分并未发生变化。BRS716 青贮的添加增加了反刍和咀嚼活动，减少了采食和空闲时间。在 F1 荷斯坦牛×娟姗牛的饲粮中，用 BRS716 青贮替代高达 100%的 FS 青贮不会改变平均产奶量，尽管改变了饲粮摄入和消化率。
