Effects of Buckwheat Straw Diet Supplemented with Mannan Oligosaccharides on Growth Performance, Digestion and Metabolism, Slaughter Performance and Meat Quality of Tan Sheep

  • LI Fei ,
  • YANG Wanzong ,
  • TIAN Daijun ,
  • GUI Ruiqi ,
  • LI Qingmin ,
  • ZHOU Yuxiang
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  • 1. Agricultural College of Ningxia University, Yinchuan 750021, China;
    2. Ningxia Animal Husbandry Workstation, Yinchuan 750004, China

Received date: 2020-09-25

  Online published: 2021-04-15

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Abstract

By adding different levels of mannan oligosaccharides (MOS) into buckwheat straw diet, the effects of MOS on growth performance, digestion and metabolism, slaughter performance and meat quality of Tan sheep were studied in this experiment, and theoretical reference was provided for its application in Tan sheep production. Twenty healthy and three months old Ningxia Tan sheep with the similar date of birth and body weight were divided into 4 groups with 5 sheep per group, only alone the cage. Sheep in control group were fed a basal diet, while those in trial groups Ⅰ, Ⅱ and Ⅲ were fed diets supplemented with 1.0%, 2.0% and 3.0% MOS based on the basal diet, respectively. The forage-to-concentrate ratio of the basal diet was 30:70, and the forage consisted of cellulase-treated buckwheat straw and alfalfa in a ratio of 40:60. The pre-feeding period was 15 days, and the trial period was 60 days. The results showed as follows:1) buckwheat straw diet supplemented with different levels of mannan oligosaccharides had no significant effects on dry matter intake, feed/gain and average daily gain of Tan sheep (P>0.05), but the average daily gain of the trial groups was higher than that of the control group, and the highest average daily gain and the lowest feed/gain were found in trial group Ⅰ. 2) Buckwheat straw diet supplemented with different levels of mannan oligosaccharides had no significant effect on the apparent digestibility of acid detergent fiber (ADF) of Tan sheep (P>0.05), but the apparent digestibility of dry matter (DM) and neutral detergent fiber (NDF) in the trial groups was significantly higher than that in the control group (P<0.05). 3) There were no significant differences in the nitrogen intake, fecal nitrogen output, urine nitrogen output, digestible nitrogen, nitrogen deposition and nitrogen apparent digestibility among groups (P>0.05). Compared with the control group, the total nitrogen output and nitrogen utilization rate of the trial groups were significantly reduced (P<0.01), and the biological value of nitrogen was significantly improved (P<0.05). The total nitrogen output was the lowest, and the nitrogen utilization rate and the biological value of nitrogen were the highest in the trial group Ⅰ, and the values of them were 6.71 g/d, 55.43% and 85.40%, respectively. 4) The eye muscle area of trial groups Ⅰ and Ⅱ was significantly improved (P<0.05). The bone to meat ratio was the lowest in the trial group Ⅰ, but the difference was not significant among groups (P>0.05). The shear force, drip loss, yellowness and brightness values of the trial group Ⅱ were significantly lower than those of the control group (P<0.05 or P<0.01), and the cooked meat rate of the trial group Ⅱ was the highest, which up to 60.28%. In summary, buckwheat straw diet supplemented with appropriate amount of MOS can increase the apparent digestibility of DM and NDF, increase the nitrogen deposition, reduce the nitrogen emission, increase the nitrogen utilization, and can decrease the shear force, drip loss, yellowness and brightness values of mutton of Tan sheep. The optimum addition amount of MOS in buckwheat straw diet of Tan sheep under the experimental conditions is 1.0% to 2.0%.

Cite this article

LI Fei , YANG Wanzong , TIAN Daijun , GUI Ruiqi , LI Qingmin , ZHOU Yuxiang . Effects of Buckwheat Straw Diet Supplemented with Mannan Oligosaccharides on Growth Performance, Digestion and Metabolism, Slaughter Performance and Meat Quality of Tan Sheep[J]. Chinese Journal of Animal Nutrition, 2021 , 33(4) : 2126 -2135 . DOI: 10.3969/j.issn.1006-267x.2021.04.032

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