The objective of this study was to evaluate the effect of supplementing enzymatically hydrolyzed yeast (EHY; Celmanax Arm and Hammer Animal Nutrition, Princeton, NJ) on transition dairy cattle. Forty multiparous Holstein cows were blocked by predicted transmitting ability and randomly assigned to 1 of 2 treatments (EHY, n = 20; or control, CON, n = 20) from 21 d before expected calving to 60 d postpartum. The EHY cows received 56 and 28 g/d in close-up and lactating diets, respectively. Dry matter intake, health events, milk production parameters, feed efficiency, colostrum quality, reproductive parameters, body weight, and body condition score were monitored. Fecal samples collected on -21, -14, -7, 0, 1, 3, 5, 7, and 14 d relative to calving were analyzed for total coliforms, Clostridium perfringens, Salmonella, and Escherichia coli O157:H7. Blood samples were collected at 7, 14, and 21 d postpartum for analysis of β-hydroxybutyrate. Sterile quarter milk samples collected at dry-off, calving, and wk 1, 2, and 3 of lactation were analyzed for milk pathogens and somatic cell count. Pre- or postpartum dry matter intake, body weight, body condition score, milk yield, and milk protein and fat yields did not differ among treatments. Milk fat and protein concentrations were greater in EHY cows than CON cows. β-Hydroxybutyrate and health events were not different among treatments. The presence of fecal C. perfringens did not differ prepartum, but was lower in EHY cows postpartum. Milk pathogens and total intramammary infections did not differ between treatments at dry-off, calving, wk 1, or wk 2, but more EHY cows were infected with Staphylococcus sp. during wk 3 than CON cows. The EHY cows showed heat earlier than CON cows, but no other reproductive parameters were affected. The EHY supplementation during the transition period did not affect dry matter intake, milk yield, health events, or reproductive parameters but did increase milk protein and fat concentrations.

中文翻译：

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酶水解酵母对过渡奶牛健康和性能的影响。

这项研究的目的是评估补充酶水解酵母（EHY； Celmanax Arm and Hammer Animal Nutrition，普林斯顿，新泽西州）对过渡奶牛的影响。40头荷斯坦奶牛被预测的传播能力所阻断，并从预期产犊到产后60 d随机分配到2种处理方法之一（EHY，n = 20；或对照，CON，n = 20）。EHY奶牛的特写和泌乳日粮分别为56和28 g / d。监测干物质摄入，健康事件，牛奶生产参数，饲料效率，初乳质量，生殖参数，体重和身体状况评分。分析相对于产犊在-21，-14，-7、0、1、3、5、7和14 d收集的粪便样品中的大肠菌群，产气荚膜梭菌，沙门氏菌和大肠杆菌O157：H7。在产后第7、14和21天收集血样，以分析β-羟基丁酸酯。在干燥，产犊和哺乳第1、2和3周时收集的无菌四分之一牛奶样品中分析了牛奶中的病原菌和体细胞计数。产前或产后干物质摄入量，体重，身体状况评分，牛奶产量以及牛奶蛋白和脂肪产量在各处理之间没有差异。EHY奶牛的乳脂和蛋白质浓度高于CON奶牛。β-羟基丁酸酯和健康事件在治疗之间没有差异。产前产气荚膜梭菌的存在与产前无差异，但产后EHY奶牛中粪便中产气荚膜梭菌的存在没有差异。干燥，产犊，第1周或第2周时，乳病原体和总的乳房内感染在两种处理之间没有差异，但是更多的EHY母牛感染了葡萄球菌。在第3周比CON奶牛高。EHY奶牛的热量要早于CON奶牛，但没有影响其他生殖参数。在过渡期内补充EHY不会影响干物质的摄入，产奶量，健康状况或生殖参数，但会增加牛奶蛋白和脂肪浓度。