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首页> 外文期刊>Animal Feed Science and Technology >In vitro ruminal fermentation kinetics and energy utilization of three Mexican tree fodder species during the rainy and dry period
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In vitro ruminal fermentation kinetics and energy utilization of three Mexican tree fodder species during the rainy and dry period

机译：雨干期三种墨西哥树饲料的体外瘤胃发酵动力学和能量利用

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摘要

A factorial experimental design (3 x 2 x 3) was used to evaluate the effect of season of harvest and type of ruminal inoculums on in vitro ruminal fermentation kinetics and energy utilization of three browse tree foliages (Lysiloma acapulcencis, Quercus laeta and Pithecellobium dulce). Browse species were harvested during the dry season (DS) and rainy season (RS) and incubated with three different ruminal inoculums: cow, goats previously adapted (AG) or not adapted (UG) to browse species fed in their daily diet. Chemical composition, total condensed tannin (TCT), free-condensed tannin (free-CT), protein-bound condensed tannin (PCT), fiber-bound condensed tannin (FCT) as well as in vitro assaying of ruminal gas production kinetics was determined, while the short chain fatty acids (SCFA) and metabolizable energy (ME) were estimated. Crude protein (CP) was considerably higher (season x browse; P<0.001) during RS. P. dulce had the lowest neutral detergent fiber (NDFom) and acid detergent fiber (ADFom) in both seasons, while L. acapulcencis had the highest values and Q. laeta values were intermediate, with an overall increase in fiber fractions in DS browse foliages (season x browse; P<0.001). TCT content in tree species revealed differences (P<0.01). FCT and PCT were lower in Q beta and P. dulce during the RS than in DS, lower (P<0.01) Free-CT fractions were observed in L. acapulcencis and Q. Laeta than in P. dulce, during both seasons. in vitro gas production parameters was increased (P<0.05) in DS than in RS in browses with low and medium tannins contents (i.e.. P. dulce and Q. Meta); consequently, browses energy utilization (i.e., SCFA and ME) and organic matter degradability (OMD) as well as fermentation efficiency (i.e., partition factor; PF) were improved (P<0.05). Generally, P. dulce had the highest (P<0.001) ruminal fermentation parameters and energy utilization values (more in DS than RS), while lowest values were founded in L acapulcencis. Ruminal fluid of AD and UG had higher (P<0.001) browse ruminal fermentation kinetics, efficiency and energy utilization than cow's rumen fluid. The browse fermentation and energy utilization was improved in DS versus in RS and the browse fermentation and utilization were highest (P<0.05) in AG ruminal fluid than the others. Our results suggested a better nutritive value of P. dulce and Q beta with low and medium tannins contents and high CP concentration in cows and goats during the DS. Goats previously fed browse species in diets had a better ability to degrade and ferment the browse species than other animals.
机译：使用析因实验设计（3 x 2 x 3）来评估收获季节和瘤胃接种物类型对三种浏览树叶子（无头实蝇，栎栎和杜鹃花皮囊）的体外瘤胃发酵动力学和能量利用的影响。 。在干旱季节（DS）和雨季（RS）收获浏览物种，并与三种不同的瘤胃接种物一起孵育：牛，先前适应（AG）或不适应（UG）的山羊，以浏览其日常饮食中喂养的物种。确定了化学成分，总缩合单宁（TCT），游离缩合单宁（free-CT），蛋白质结合缩合单宁（PCT），纤维结合缩合单宁（FCT）以及瘤胃气体产生动力学的体外测定，而短链脂肪酸（SCFA）和代谢能（ME）被估算。 RS期间粗蛋白（CP）显着较高（季节x浏览; P <0.001）。在两个季节中，杜氏假丝藻的中性洗涤剂纤维（NDFom）和酸性洗涤剂纤维（ADFom）最低，而无花苜蓿L. acapulcencis的值最高，而Q. laeta值处于中间水平，DS浏览叶中的纤维分数总体增加（季节x浏览; P <0.001）。树种中TCT含量存在差异（P <0.01）。在RS期间，Q beta和P. dulce中的FCT和PCT均比DS中低，在两个季节中，无荚果乳酸杆菌和Q. Laeta中的Free-CT分数均低于P. dulce中（P <0.01）。在单宁含量低和中等的浏览器中，DS的体外产气参数比RS的要高（P <0.05）;即P. dulce和Q. Meta;结果，浏览能量利用率（即SCFA和ME）和有机物降解性（OMD）以及发酵效率（即分配因子; PF）得到改善（P ＜0.05）。通常，杜氏假丝酵母的瘤胃发酵参数和能量利用值最高（P <0.001）（DS中比RS高），而荚果乳酸菌中最低。 AD和UG的瘤胃液比牛瘤胃液具有更高的（P <0.001）浏览瘤胃发酵动力学，效率和能量利用。 DS中的浏览发酵和能量利用比RS提高了，而AG瘤胃液中的浏览发酵和利用是最高的（P <0.05）。我们的研究结果表明，在DS中，牛和山羊的丹宁酸含量低和中等，且CP含量高时，杜氏假单胞菌和Qβ的营养价值更高。以前在饮食中饲喂浏览物种的山羊比其他动物具有更好的降解和发酵浏览物种的能力。

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