Selection of plant oil as a supplemental energy source by monitoring rumen profiles and its dietary application in Thai crossbred beef cattle
Selection of plant oil as a supplemental energy source by monitoring rumen profiles and its dietary application in Thai crossbred beef cattle
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DOI：
10.5713/ajas.18.0946
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发表时间：
2019-10-01
期刊：
影响因子：
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通讯作者：
Kobayashi, Yasuo
中科院分区：
文献类型：
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作者：
Matsuba, Keiji;Padlom, Apirada;Kobayashi, Yasuo
目的：筛选出一种对瘤胃发酵和微生物无抑制作用的植物油，并通过一系列体外试验确定其最佳添加水平。然后，通过对泰国杂交肉牛的生长、屠体、血液和瘤胃特性的监测，对所选的精油进行饲养研究。方法：将瘤胃液与含有泰国广泛存在的三种不同植物油(椰子油、棕榈油和大豆油)之一的底物孵化。通过检测不同油脂对瘤胃发酵和微生物的影响，筛选出对瘤胃参数无不良影响的油脂。然后，监测瘤胃参数对不同水平棕榈油的剂量反应，以确定适宜的添加水平。对12头泰国杂交肉牛进行了为期8个月的添加棕榈油的饲养试验。结果：批培养试验表明，椰子油和大豆油对瘤胃内最有效的纤维杆菌琥珀酸杆菌有抑制作用，而棕榈油在添加5%或更高水平时对瘤胃发酵产物和瘤胃发酵产物无不良影响。日粮中添加2.5%棕榈油可提高饲料转化率，对瘤胃发酵无不良影响。日粮中添加棕榈油可提高血液胆固醇水平，提示实验牛处于较高的能量状态。结论：在体外添加水平为5%的棕榈油对瘤胃发酵和微生物无不良影响。饲喂添加棕榈油的日粮的泰国杂交牛的FCR有所提高，瘤胃和屠体性状没有明显变化，但血液胆固醇水平有所提高。因此，棕榈油可以作为一种有益的能源。
Objective: The present study was conducted to select a plant oil without inhibitory effects on rumen fermentation and microbes, and to determine the optimal supplementation level of the selected oil in a series of in vitro studies for dietary application. Then, the selected oil was evaluated in a feeding study using Thai crossbred beef cattle by monitoring growth, carcass, blood and rumen characteristics.Methods: Rumen fluid was incubated with substrates containing one of three different types of plant oil (coconut oil, palm oil, and soybean oil) widely available in Thailand. The effects of each oil on rumen fermentation and microbes were monitored and the oil without a negative influence on rumen parameters was selected. Then, the dose-response of rumen parameters to various levels of the selected palm oil was monitored to determine a suitable supplementation level. Finally, an 8-month feeding experiment with the diet supplemented with palm oil was carried out using 12 Thai crossbred beef cattle to monitor growth, carcass, rumen and blood profiles.Results: Batch culture studies revealed that coconut and soybean oils inhibited the most potent rumen cellulolytic bacterium Fibrobacter succinogenes, while palm oil had no such negative effect on this and on rumen fermentation products at 5% or higher supplementation level. Cattle fed the diet supplemented with 2.5% palm oil showed improved feed conversion ratio (FCR) without any adverse effects on rumen fermentation. Palm oil-supplemented diet increased blood cholesterol levels, suggesting a higher energy status of the experimental cattle.Conclusion: Palm oil had no negative effects on rumen fermentation and microbes when supplemented at levels up to 5% in vitro. Thai crossbred cattle fed the palm oil-supplemented diet showed improved FCR without apparent changes of rumen and carcass characteristics, but with elevated blood cholesterol levels. Therefore, palm oil can be used as a beneficial energy source.