Vicente Fernando, Rodríguez María Luisa, Martínez-Fernández Adela, Soldado Ana, Argamentería Alejandro, Peláez Mario, de la Roza-Delgado Begoña
Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), 33300 Villaviciosa, Asturias, Spain.
Sociedad Asturiana de Servicios Agropecuarios, SL (ASA), 33199 Granda, Siero, Asturias, Spain.
ScientificWorldJournal. 2014;2014:279614. doi: 10.1155/2014/279614. Epub 2014 Nov 25.
This study examines the relationship between subclinical ketosis (SCK) in dairy cows and the butyric acid content of the silage used in their feeding. Twenty commercial farms were monitored over a period of 12 months. The feed at each farm and the silages used in its ration were sampled monthly for proximal analysis and for volatile fatty acid analysis. A total of 2857 urine samples were taken from 1112 cows to examine the ketonuria from about 30 days prepartum to 100 postpartum. Wide variation was recorded in the quality of silages used in the preparation of diets. Approximately 80% of the urine samples analyzed had no detectable ketone bodies, 16% returned values indicative of slight SCK, and the remainder, 4%, showed symptoms of ketosis. Most of the cases of hyperkenuria were associated with the butyric acid content of the silage used (r2=0.56; P<0.05). As the metabolizable energy content of the feed was similar, no relationship was observed between the proportion of cows with SCK and the energy content of the feed. In our study, the probability of dairy cows suffering SCK is higher when they are eating feed made from silage with a high butyric acid content (35.2 g/kg DM intake).
本研究考察了奶牛亚临床酮病（SCK）与用于喂养它们的青贮饲料中丁酸含量之间的关系。在12个月的时间里对20个商业农场进行了监测。每月对每个农场的饲料及其日粮中使用的青贮饲料进行采样，以进行常规分析和挥发性脂肪酸分析。从1112头奶牛身上采集了总共2857份尿液样本，以检查从产前约30天到产后100天的酮尿情况。在日粮制备中使用的青贮饲料质量存在很大差异。分析的尿液样本中约80%未检测到酮体，16%的样本检测值表明存在轻微亚临床酮病，其余4%表现出酮病症状。大多数高酮尿病例与所使用青贮饲料的丁酸含量有关（r2 = 0.56；P<0.05）。由于饲料的可代谢能量含量相似，未观察到患有亚临床酮病的奶牛比例与饲料能量含量之间的关系。在我们的研究中，当奶牛食用由丁酸含量高（每千克干物质摄入量35.2克）的青贮饲料制成的饲料时，患亚临床酮病的概率更高。
