Subacute rumen acidosis in lactating cows: an investigation in intensive Italian dairy herds
Subacute rumen acidosis in lactating cows: an investigation in intensive Italian dairy herds
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DOI：
10.1111/j.1439-0396.2007.00696.x
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发表时间：
2007-06-01
影响因子：
2.7
通讯作者：
Andrighetto, I.
中科院分区：
文献类型：
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作者：
Morgante, M.;Stelletta, C.;Andrighetto, I.
亚急性瘤胃酸中毒（SARA）是集约化奶牛场最重要的代谢障碍之一，影响瘤胃发酵、动物福利、生产力和农场盈利能力。本研究的目的是研究发生在密集的意大利奶牛群的SARA，并确定饮食组成，瘤胃pH值和短链脂肪酸（SCFA）浓度之间的关系。对10个商业奶牛群进行了调查;在每个牛群中随机选择12头奶牛，这些奶牛没有疾病的临床体征，身体状况良好，并且在5至60天的牛奶中（DIM），进行瘤胃穿刺术并获得瘤胃液。取样后立即测定瘤胃pH值，并在储存后测定样品中瘤胃液中SCFA的浓度。本研究的另一个目的是详细研究瘤胃穿刺术对动物健康的影响：本研究可以证实这种技术作为瘤胃取样的极端有效性。使用SIGMA STAT 2.03对结果进行方差分析和相关性分析。结果表明，3个奶牛场存在SARA（超过33%的奶牛瘤胃pH < 5.5），5个奶牛场存在危急情况（超过33%的奶牛瘤胃pH < 5.8），2个奶牛场瘤胃pH正常。特别是，奶牛群在低pH值、临界pH值和正常pH值牛群中的平均SCFA浓度分别为150、145和123 mmol/l。即使有SARA的畜群在最初的化学组成和残留饲料之间表现出轻微的不一致，但在饲料组成之间没有显着差异。在受影响的牛群中，无法了解SARA的确切原因。动物管理似乎是发展SARA的最重要因素之一，包括全混合日粮的制备。
Subacute rumen acidosis (SARA) represents one of the most important metabolic disorders in intensive dairy farms that affects rumen fermentations, animal welfare, productivity and farm profitability. The aim of the present study was to study the occurrence of SARA in intensive Italian dairy herds and to determine the relationship between diet composition, ruminal pH and short chain fatty acids (SCFA) concentration. Ten commercial dairy herds were investigated; twelve cows in each herd were selected randomly among animal without clinical signs of disease, with good body condition and between 5 and 60 day-in-milk (DIM), to perform rumenocentesis and obtain rumen fluid. Ruminal pH was determined immediately after sampling and concentration of SCFA in ruminal fluid was determined on samples after storage. An other objective of this research was to study in detail the effects of rumenocentesis on animal health: this study could confirm the extreme validity of this technique as ruminal sampling. Results were subject to ANOVA and correlation analysis using SIGMA STAT 2.03. The results indicated the presence of SARA in three herds (more than 33% cows with rumen pH < 5.5), a critical situation (more than 33% cows with rumen pH < 5.8) in five farms and a normal rumen pH condition in two herds. In particular, dairy herds show on average SCFA concentration of 150, 145, 123 mmol/l for low pH, critical pH and normal pH herds respectively. There were not significant differences among diet composition even if herds with SARA showed a light discordance between initially chemistry composition and residual feed. In the affected herds it was not possible to understand the exact causes of SARA. Animal management seems to be one of the most important factors in developing SARA including total mixed ration preparation.