Effect Of Fattening Ways On Rumen Fermentation And The Number Of Several Rumen Microorganisms In Hulunbeier Sheep And Cashmere Goats

This experiment was conducted to study the changes in rumen fermentation and the number of several rumen microorganisms of Hulunbeier male lambs and crossbred lambs between Hulunbeier sheep and Dorper sheep under the grazing fattening and grazing with supplementary feeding, and the changes in the number of several rumen microorganisms of adult female goats and lambs of cashmere goats under the grazing fattening and drylot feeding fattening. This study provided theoretical basis for the improvement of ecological environment of grassland, determination of the fattening scheme in Hulunbeier lambs and cashmere goats, and increment of economic benefits of herdsmen. The test was divided into three parts. Part one and part two were conducted using sixty Hulunbeier male lambs and those crossbred lambs respectively, to evaluate the effect of natural grazing and grazing with supplementary feeding on rumen fermentation and the number of several rumen microorganisms. The experiment was a2×2factorial arrangement with a total of4groups, and the first factor was feeding ways (natural grazing, grazing with supplementary feeding), and the second factor was breed (Hulunbeier male lambs, crossed male lambs). The nature grazed lambs were fattened in nature, and grazed lambs with supplementary feeding were fed additional diets twice a day. The experiment lasted for60days. Five lambs in each group were selected and slaughtered to collect rumen liquids at the end of the experiment.Part three was conducted respectively using sixty adult female cashmere goats and weaned cashmere goat lambs at the age of four month old, to evaluate the influence of the grazing fattening and drylot feeding fattening on the number of several rumen microorganisms. The experiment was also a2×2factorial arrangement with a total of4groups, the first factor was feeding ways (natural grazing, drylot feeding fattening), and the second factor was age (adult female goats, lambs of cashmere goats). The nature grazing were fattened in nature, the drylot feeding fattening were completely fattened using total mixed ration. At the end of the experiment, six goats respectively from each group were slaughtered to collect the ruminal fluid samples.The results were showed as followed under the present experimental conditions:1. Compared with natural grazing, there was a significant increase in ruminal NH3-N and BCP contents (P<0.05) and there was a tendency decreased in ruminal pH value (P=0.07) in Hulunbeier lambs and crossed lambs for grazing with supplementary feeding. The way of grazing with supplementary feeding promoted rumen fermentation and utilization of nitrogen by rumen microbes.2. Compared with natural grazing, there was a significant increase in Anaerovibrio lipolyticain for grazed Hulunbeier lambs and crossed lambs with supplementary feeding (P<0.05), and the number of total bacteria, F.succinogenes and Selenomonas ruminantium tended to be increased(P=0.06, P=0.06, P=0.08).3. Compared with Hulunbeier male lambs, there was a significant increase in Anaerovibrio lipolytica and Selenomonas ruminantium for crossed male lambs (P<0.05), and the number of total methanogens tended to be increased(P=0.08, P=0.08).4. Compared with natural grazing, there was a significant increase in Selenomonas ruminantium in Cashmere goats for feeding fattening (P<0.05), and the number of Anaerovibrio lipolytica tended to be increased(P=0.07).5. Compared with Cashmere male lambs, there was a significant increase in Streptococcus bovis in adult female goats (P<0.05), and the number of Anaerovibrio lipolytica tended to be increased (P=0.08)...