Molecular Nutrition

Effects of Yeast Culture Supplementation in Diets with Different Starch Sources on Growing Performance, Nutrient Digestibility and Ruminal Fermentation Parameters in Hu Sheep

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  • 1. State Key Laboratory of Grassland Agro-Ecosystems;Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs;College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
    2. Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, China;
    3. Engineering Laboratory of Mutton Sheep Breeding and Reproduction Biotechnology in Gansu Province, Minqin 733300, China

Received date: 2018-05-23

  Online published: 2018-12-19

Abstract

The objective of this experiment was to study the effects of yeast culture (YC) supplementation in diets with different starch sources on growth performance, slaughter performance, nutrient digestion and ruminal fermentation parameters of Hu sheep. The experiment adopted a 2×2 factorial arrangement. A total of 120 two-month-old healthy Hu sheep [(21.69±2.49) kg] were assigned to four groups: the barley starch supplemented with 1% YC (BS-1) group, the barley starch(BS) group, the corn starch supplemented with 1% YC (CS-1) group and the corn starch (CS) group, with five replicates in each group and 6 sheep in each replicates. The preliminary test period was 7 d and the formal trial period was 56 d. The results showed as follows: 1) there were no significant differences in final weight, average daily gain, dry matter intake and the ratio of feed to gain among groups (P>0.05). 2) There were no significant differences in live weight before slaughter, carcass weight, dressing percentage, back-fat thickness, GR value, tail fat weight and perirenal fat weight among groups (P>0.05), but the eye muscle area of groups BS-1 and CS-1 were significantly higher than those in groups BS and CS (P<0.05). 3) The apparent digestibility of dry matter and organic matter in groups were no significant difference (P>0.05), but the apparent digestibility of neutral detergent fiber (NDF) and acid detergent fiber (ADF) in groups BS-1 and CS-1 were significantly higher than those in groups BS and CS (P<0.05). 4) There were no significant differences in total volatile fatty acid (TVFA) content, the ratios of acetic acid, propionic acid, butyric acid, valeric acid, isobutyric acid, isovaleric acid to TVFA and the ratio of acetic to propionic among groups (P>0.05), but the ratio of acetate to TVFA in group BS was significantly higher than that in group CS (P<0.05). In summary, YC supplementation in diets with different starch sources does not change ruminal fermentation pattern, but significantly increase the apparent digestibility of NDF and ADF, thereby increasing the utilization of roughage.

Cite this article

YAN Baipeng, LAN Guisheng, LI Guozhang, NIU Xiaolin, LI Fadi, LI Fei, WENG Xiuxiu . Effects of Yeast Culture Supplementation in Diets with Different Starch Sources on Growing Performance, Nutrient Digestibility and Ruminal Fermentation Parameters in Hu Sheep[J]. Chinese Journal of Animal Nutrition, 2018 , 30(12) : 5145 -5152 . DOI: 10.3969/j.issn.1006-267x.2018.12.043

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