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Effects of Yeast Culture on Performance ,Nutrient Digestibility and Rumen Development in Shanbei Cashmere Goat Lambs

Author: KouHuiJuan
Tutor: ZhangEnPing
School: Northwest University of Science and Technology
Course: Animal Nutrition and Feed Science
Keywords: Forage to concentrate ratio Yeast Culture Lamb Production performance Digestibility Rumen development
CLC: S826.5
Type: Master's thesis
Year: 2011
Downloads: 79
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Abstract

In this study, different forage to concentrate ratio diets supplemented with yeast culture (yeast culture, YC), to explore YC on lamb growth performance, nutrient digestibility and rumen organization morphological development impact. Body mass were selected and 16 day-old northern Shaanxi cashmere goats lambs were divided into 4 groups according to a randomized complete block design, group I lambs fed roughage than 3:7 ration 20g/kg YC; Ⅱ group lambs fed forage to concentrate ratio 3:7 ration, do not add the YC; the group III lamb feeding forage to concentrate ratio 5:5 ration 20g/kg YC; IV group lambs fed forage to concentrate ratio 5:5 ration, do not add YC. Test 1: through a period of the 50d feeding trials, to record lambs increased body weight and feed intake and blood samples were collected YC on lamb growth performance and blood biochemical indicators designed to be added to the diets of the study. The results showed that the average daily gain of the I group lambs was significantly higher than that in group Ⅱ (70.80 g / only vs 57.7 g / only), the group III lamb dry matter intake was significantly higher than that in group Ⅳ (P lt; 0.05), but 4 feed to gain ratio differences between the treatment groups is not significant (P gt; 0.05), the group Ⅰ lowest (7.72); dietary forage to concentrate ratio interaction effects with YC had no significant effects on lamb growth and performance indicators ( P gt; 0.05). Four treatment groups, plasma glucose, urea nitrogen, albumin, and total nitrogen concentration differences are not significant (P gt; 0.05); YC 0,2,4,6,8 h after feeding, the plasma concentration of IGF-Ⅰ nor significant impact. Test 2: digestion and metabolism trials added to the diets of the study YC diet nutrient digestibility. The results show that the group I lambs crude protein (CP), the apparent digestibility of neutral detergent fiber (NDF) was significantly higher (P lt; 0.05) Ⅱ group; Ⅲ and Ⅳ group Lamb of these two kinds of nutrients table concept digestibility was no significant difference (P = 0.517, P = 0.390). Four treatment groups of dry matter, organic matter, crude fat, acid detergent fiber apparent digestibility differences are not significant (P gt; 0.05). Dietary forage to concentrate ratio and YC interaction effects of CP, NDF apparent digestibility affect significantly (P lt; 0.05) apparent digestibility of other nutrients not statistically significant (P gt; 0.05). YC impact on the amount of nitrogen deposition, Ⅰ group was significantly higher than that in group Ⅱ (P lt; 0.05), Ⅲ group was significantly higher than that in group Ⅳ (P lt; 0.05). The group I lambs nitrogen deposition rate was also significantly higher than that in group Ⅱ (P lt; 0.05). Lamb fecal nitrogen excretion Ⅰ group than in II group (5.06 g / (d · only) vs 5.43 g / (d only)), but the difference was not significant. Test 3: Test 2 after slaughtering sheep of all tests, collect rumen fluid and rumen tissue samples, on-site determination of rumen volume, quality and complex stomach gastric quality. The rumen tissue sample made of paraffin sections after HE staining, determination of the ruminal nipple height, width, and the rumen wall thickness. The results show that the quality of Ⅰ networking stomach was significantly higher than that in group Ⅱ (P lt; 0.05), YC complex stomach the stomach Quality impact was not significant. Two kinds of roughage than diets conditions, YC add a group of carboxymethyl cellulase activity was significantly higher than (P lt; 0.05) does not add a group, YC add a group with the group do not add pectinase, xylanase YC add a group of enzyme activity were increased trend; dietary forage to concentrate ratio and YC interaction effects of four kinds of cellulose digestion enzyme activity and filter paper activity difference was not significant (P gt; 0.05), there was no significant impact. YC, forage to concentrate ratio and YC interaction effect of rumen nipple width showed significantly affect (P lt; 0.01). Nipple height, width the group Ⅲ lamb rumen very significantly greater than the group Ⅳ (P lt; 0.01), rumen wall thickness was significantly larger than that in group Ⅳ (P lt; 0.05); Ⅰ, Ⅱ groups the lamb rumen nipple height, width and rumen wall thickness differences were not significant (P gt; 0.05). The lamb rumen color, the the 3:7 ration conditions under treated rumen darker in color, dark brown, 5:5 ration 2 treated lamb rumen epithelial nipple pale brown or milky white. The sectioning observed, the group Ⅱ rumen papilla multi-branch phenomenon Ⅳ group nipple than thin and Ⅰ, Ⅲ group nipple tongue shape and well-developed. Taking these three trials, forage to concentrate ratio 3:7 diet the add 20g/kgYC able to improve lamb production performance. The YC able to improve forage to concentrate ratio 3:7 ration CP, NDF apparent digestibility, to promote nitrogen deposition. The YC able to promote lamb rumen development, help to maintain normal rumen papilla morphology, the effect is more pronounced in the high concentrate diet.

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