Zhao Fangfang, Ren Wen, Zhang Aizhong, Jiang Ning, Liu Wen, Wang Faming
College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, China.
Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China.
Asian-Australas J Anim Sci. 2018 Oct;31(10):1611-1618. doi: 10.5713/ajas.17.0833. Epub 2018 Apr 12.
The objective of this experiment was to examine the effects of different amylose/amylopectin ratios on rumen fermentation and development of fattening lambs.
Forty-eight 7-day-old male Small-tailed Han sheep×Northeast fine wool sheep were randomly assigned to four treatments of dietary amylose/amylopectin ratios (0.12, 0.23, 0.24, and 0.48 in tapioca starch, corn starch, wheat starch and pea starch diets, respectively). Three lambs from each treatment were slaughtered at 21, 35, 56, and 77 days of age to determine the rumen fermentation and development.
Compared with tapioca starch diet, the pea starch diet significantly increased the concentration of ammonia nitrogen in the ruminal fluid of lambs but significantly decreased the bacterial protein content. At 56 and 77 d, the rumen propionate concentration tended to be greatest in the tapioca starch group than in other groups. The rumen butyrate concentration was the greatest in lambs fed on pea starch compared with those fed on other starch diets. Furthermore, the pea starch diet significantly stimulated rumen development by increasing the papillae height, width and surface area in the rumen ventral or dorsal locations in lambs. However, different amylose/amylopectin ratios diets did not significantly affect the feed intake, body weight, average daily gain, the relative weight and capacity of the rumen in lambs with increasing length of trial periods.
Lambs early supplemented with a high amylose/amylopectin ratio diet had favourable morphological development of rumen epithelium, which was not conducive to bacterial protein synthesis.
本实验旨在研究不同直链淀粉/支链淀粉比例对育肥羔羊瘤胃发酵及发育的影响。
将48只7日龄雄性小尾寒羊×东北细毛羊随机分为四组，分别给予不同直链淀粉/支链淀粉比例的日粮（木薯淀粉日粮、玉米淀粉日粮、小麦淀粉日粮和豌豆淀粉日粮中的比例分别为0.12、0.23、0.24和0.48）。每组选取3只羔羊，分别在21日龄、35日龄、56日龄和77日龄时屠宰，以测定瘤胃发酵及发育情况。
与木薯淀粉日粮相比，豌豆淀粉日粮显著提高了羔羊瘤胃液中氨氮浓度，但显著降低了细菌蛋白含量。在56日龄和77日龄时，木薯淀粉组瘤胃丙酸浓度高于其他组。与其他淀粉日粮喂养的羔羊相比，豌豆淀粉日粮喂养的羔羊瘤胃丁酸浓度最高。此外，豌豆淀粉日粮通过增加羔羊瘤胃腹侧或背侧乳头的高度、宽度和表面积，显著促进了瘤胃发育。然而，随着试验期延长，不同直链淀粉/支链淀粉比例的日粮对羔羊的采食量、体重、平均日增重、瘤胃相对重量和容积均无显著影响。
早期补充高直链淀粉/支链淀粉比例日粮的羔羊瘤胃上皮形态发育良好，但不利于细菌蛋白合成。
