Purwin Cezary, Nogalski Zenon, Starczewski Maciej, Czurgiel Sylwia, Fijałkowska Maja, Momot Martyna, Borsuk Marta
Department of Animal Nutrition and Feed Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-719 Olsztyn, Poland.
Department of Cattle Breeding and Milk Evaluation, University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-719 Olsztyn, Poland.
Animals (Basel). 2020 Sep 25;10(10):1746. doi: 10.3390/ani10101746.
The aim of this study was to evaluate the effect of partial or complete substitution of alfalfa silage with Virginia fanpetals silage in rations based on maize silage on feed intake, digestibility, ruminal fermentation and milk yield and physicochemical characteristics. Nine Polish Holstein Friesian cows in the second half of lactation were fed three experimental diets in a replicated 3 × 3 Latin square design as follows: maize silage + alfalfa silage, maize silage + alfalfa silage and Virginia fanpetals silage in a 50:50 ratio, maize silage + Virginia fanpetals silage. Complete substitution caused an increase in dry matter intake (DMI), total volatile fatty acids (VFA), acetic acid to propionic acid (A/P) ratio, N-NH in the rumen contents and milk urea and a decrease in the feed conversion ratio. The partial and complete substitution changed the profile of milk fatty acids, resulting in a slight increase in saturated fatty acids (SFA) and a decrease in unsaturated fatty acids (UFA) as well as in all functional fatty acids except vaccenic acid. The most promising production effects were achieved through partial substitution of alfalfa silage with the Virginia fanpetals silage.
本研究的目的是评估在以玉米青贮饲料为基础的日粮中，用弗吉尼亚扇叶花青贮饲料部分或完全替代苜蓿青贮饲料对采食量、消化率、瘤胃发酵、产奶量以及理化特性的影响。选用9头处于泌乳后期的波兰荷斯坦黑白花奶牛，按照重复3×3拉丁方设计，给它们饲喂三种试验日粮，具体如下：玉米青贮饲料+苜蓿青贮饲料、玉米青贮饲料+苜蓿青贮饲料与弗吉尼亚扇叶花青贮饲料按50:50比例混合的日粮、玉米青贮饲料+弗吉尼亚扇叶花青贮饲料。完全替代导致干物质采食量（DMI）、总挥发性脂肪酸（VFA）、瘤胃液中乙酸与丙酸的比例（A/P）、瘤胃内容物中的N-NH以及乳尿素增加，饲料转化率降低。部分和完全替代改变了乳脂肪酸的组成，导致饱和脂肪酸（SFA）略有增加，不饱和脂肪酸（UFA）以及除共轭亚油酸外的所有功能性脂肪酸减少。用弗吉尼亚扇叶花青贮饲料部分替代苜蓿青贮饲料取得了最理想的生产效果。
