Abstract：
A short-term study was conducted to compare the effect of using poplar wood chips (PWC) instead of wheat straw (WS) litter in dairy cows. A total of 38 lactating Holstein cows (204 ± 119 days in milk, 26.9 ± 6.5 kg of milk yield [MY]) were housed in a tiestall farm for a 10-d trial including 5 d of adaptation followed by 5 sampling days (from d 5 to 10). Cows were divided into 2 homogeneous groups: one group was bedded with WS, and the second with PWC. Both litter materials were provided in the amount of 7 kg/stall per d. Each group was composed of 3 subgroups of 6 or 7 cows; the subgroups were physically separated along the feeding line by wooden boards. During the sampling days, fecal composition, used litter composition, and bacterial count (Clostridium spp., Salmonella spp., Escherichia coli, Lactobacillus, and total bacterial count) were analyzed by subgroup twice a day. On d 1 and from d 5 to 10, udder hygiene score and cow cleanliness score were also evaluated individually twice a day. Meanwhile MY, milk hygiene (total bacterial count [TBC], coliform bacterial count [CBC], and spore-forming units [SFU]) and quality were measured and analyzed from 9 animals per group. Moreover, individual animal behavior (body position and behavioral traits) and subgroup dry matter intake were measured on d 9 and 10. Fecal dry matter did not differ between groups, PWC had the lowest used litter moisture and N content favoring the highest clean cow frequency, but also gave rise to the greatest used litter microbial contamination. The MY, milk quality, TBC, SFU, and CBC were similar. The lying behavior frequency was similar between groups. However, the PWC group showed the lowest sleeping frequency, the highest frequency of other behaviors (including discomfort signs), and the lowest dry matter intake. However, despite this apparent reduction in cow comfort, no biologically important differences were observed in this short-term study between cows on PWC and WS in milk production or hygiene.
摘要：
进行了一项短期研究，以比较在奶牛中使用杨木片（PWC）代替麦草（WS）凋落物的效果。总共38头泌乳荷斯坦奶牛（牛奶中的204±119天，26.9±6.5kg的产奶量[MY]）被安置在tiestall农场中进行10天的试验，包括5天的适应，然后是5天的采样天（从5天到10天）。奶牛分为2个同质组：一组用WS铺床，第二个是普华永道。两种凋落物材料均以每天7公斤/摊位的量提供。每组由3只6或7头母牛组成；亚组沿饲喂线通过木板物理分离。在采样期间，粪便成分,用过的垫料成分，和细菌计数（梭菌属。,沙门氏菌属。,大肠杆菌,乳酸菌,和总细菌计数）按亚组每天分析两次。在第1天和第5天至第10天，乳房卫生评分和奶牛清洁度评分也分别进行了评估，每天两次。同时我的,牛奶卫生(细菌总数[TBC]，大肠杆菌计数[CBC]，和孢子形成单位[SFU]），并从每组9只动物中测量和分析质量。此外，在第9天和第10天测量个体动物行为（体位和行为特征）和亚组干物质摄入量。粪便干物质在组间没有差异，PWC的凋落物水分和氮含量最低，有利于最高的清洁奶牛频率，但也引起了最大的垃圾微生物污染。我的,牛奶质量,TBC,SFU,和CBC相似。组间撒谎行为频率相似。然而,PWC组的睡眠频率最低,其他行为（包括不适症状）的频率最高，和最低的干物质摄入量。然而,尽管奶牛舒适度明显下降，在这项短期研究中，PWC和WS的奶牛在产奶或卫生方面没有观察到生物学上的重要差异。
