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首页> 外文期刊>The Journal of Agricultural Science >Effects of pre-incubation in sheep and goat saliva on in vitro rumen digestion of tanniferous browse foliage.
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Effects of pre-incubation in sheep and goat saliva on in vitro rumen digestion of tanniferous browse foliage.

机译：绵羊和山羊唾液预孵育的影响在体外瘤胃消化的味道弯曲叶片。

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摘要

A two-stage in vitro procedure was used for assessing the activity of parotid saliva to enhance rumen digestion of tanniniferous browse foliage. The procedure consisted of pre-incubation in saliva for 4 h at 39 degrees C followed by incubation in diluted buffered rumen fluid. Using this procedure, a study was conducted to examine the effects of pre-incubation in sheep (SS), quebracho-supplemented sheep (qSS) and goat (GS) parotid saliva or in McDougall's artificial saliva (AS, used as control) on in vitro rumen fermentation kinetics (estimated using the gas production technique) of browse foliage from six shrub species (Cytisus scoparius, Genista florida, Rosa canina, Quercus pyrenaica, Cistus laurifolius and Erica australis) collected over two seasons (spring and autumn), thus varying the in vitro digestibility (from 0.597 to 0.903) and tannin contents (from 3 to 130 g tannic acid equivalent/kg dry matter (DM)). Saliva was collected from four sheep and four goats fed alfalfa hay, and from four sheep fed the same alfalfa hay but supplemented with quebracho (rich in condensed tannins) for 60 d, through a cannula inserted in the parotid duct, and rumen fluid was always from sheep fed alfalfa hay. The extent of degradation when browse foliage was pre-incubated in qSS was similar to that observed with control AS (0.449 v. 0.452, respectively), and 8% less than the value with pre-incubation in SS (0.490). In vitro fermentation kinetics (gas production parameters) of browse foliage were not significantly enhanced with pre-incubation in qSS compared with SS, whereas in vitro digestibility and extent of degradation in the rumen were significantly reduced with qSS compared with SS. After pre-incubation in sheep and goat saliva, the extent of browse foliage degradation was significantly increased by 4-8% compared with pre-incubation in the control AS. Fermentation efficiency of browse foliage was increased (P<0.05) with pre-incubation in GS compared with SS. Sheep or goat saliva may have some activity to affect in vitro rumen fermentation of the foliage samples incubated, enhancing extent of degradation of tannin-rich browse. However, a relationship between the magnitude of this effect and the tannin content of the browse foliage could not be established, suggesting that sheep and goat saliva may not be particularly important in neutralizing tannins.
机译：用于评估腮腺唾液的活性，以增强瘤胃瘤瘤叶片的瘤胃消化的两阶段。该方法包括在唾液中孵育4小时，然后在稀释的缓冲瘤胃液中孵育。使用该程序，进行了研究以检查绵羊（ss），quebracho-prodeded绵羊（qss）和山羊（gs）腮腺唾液中的预孵育（ss），quebracho-补充的绵羊（qss）和麦克风（Mcdougall的人工唾液（如用途）的影响从六个灌木种类（Cytisus scoparius，Genista佛罗里达州，罗莎Canina，Quercus Pyrenaica，Quercus Pyrenaica，Cistus Laurifolius和Erica Australis）的体外瘤胃发酵动力学（使用气体生产技术）收集了两个赛季（春季和秋季），因此变化了体外消化率（从0.597至0.903）和单宁含量（从3-130g鞣酸当量/ kg干物质（dm））。从四只羊和四只山羊收集唾液，喂养苜蓿干草，并通过四只羊喂相同的苜蓿干草，但通过插入腮腺管道中的插管，通过插入的插管补充了Quebracho（富含浓缩单宁的浓缩单宁），并始终如一从绵羊喂alfalfa干草。在QSS中预孵育浏览叶面时的降解程度与用对照观察到的（分别为0.452分别为0.452），比SS预孵育的值低8％（0.490）。与SS相比，在QSS中预孵育没有显着增强浏览叶片的体外发酵动力学（气体生产参数），而QSS与SS相比，QSS的体外消化率和瘤胃中的降解程度显着降低。在绵羊和山羊唾液中孵育后，与对照预孵育相比，浏览叶子降解的程度明显增加4-8％。与SS相比，增加浏览叶子的发酵效率（P <0.05），预孵育Gs。绵羊或山羊唾液可能有一些活性来影响叶子样品的体外瘤胃发酵，提高富含单宁浏览的降解程度。然而，无法建立这种效果的大小与浏览叶子的单宁含量之间的关系，表明绵羊和山羊唾液在中和单宁中可能尤为重要。

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