RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Dietary Guanidineacetic Acid on Growth Performance and Nutrient Digestion and Metabolism of Lambs

  • LIU Xiaomei ,
  • HAO Xiaoyan ,
  • CUI Qiao ,
  • ZHANG Hongxiang ,
  • WU Ximing ,
  • GENG Haixia ,
  • ZHANG Hongliang ,
  • ZHANG Chunxiang ,
  • ZHANG Jianxin
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  • 1. College of Animal Science, Shanxi Agricultural University, Taigu 030801, China;
    2. Xianghe Lingshang Agriculture and Animal Husbandry Development Co. Ltd. of Shanxi, Youyu 037200, China;
    3. Anhong Testing Technology Co. Ltd. of Shanxi, Taiyuan 030000, China

Received date: 2021-05-11

  Online published: 2021-12-16

Abstract

This experiment was conducted to investigate the effects of guanidineacetic acid (GAA) on growth performance and nutrient digestion and metabolism of lambs. Forty-eight 4-months-old Dorper×thin-tailed Han ram lambs with similar body weight of (24.8±1.3) kg were randomly divided into 4 groups with 12 lambs in each group. Lambs in each groups were fed the basal diets supplemented with 0 (control group), 300 (300GAA group), 600 (600GAA group) and 900 mg/kg (900GAA group) GAA, respectively. The adaptation period lasted for 15 days, and the experimental period lasted for 70 days. At the end of the experiment, six lambs with similar body weight in each groups were selected to carry out the digestive and metabolic experiment. The results showed as follows:1) the final weight and average daily gain of 900GAA group were significantly higher than those of control group, 300GAA group and 600GAA group (P<0.05), and the feed to gain ratio was significantly lower than that of control group, 300GAA group and 600GAA group (P<0.05). 2) The apparent digestibility of dry matter (DM), organic matter (OM), crude protein (CP) and neutral detergent fiber (NDF) of 900GAA group was significantly higher than that of control group, 300GAA group and 600GAA group (P<0.05). 3) The gross energy intake, digestible energy, methane energy, metabolic energy, apparent digestibility of gross energy and metabolizability of gross energy of 900GAA group were significantly higher than those of control group, 300GAA group and 600GAA group (P<0.05). 4) The nitrogen intake, digestible nitrogen, nitrogen deposition, apparent digestibility of nitrogen of 900GAA group were significantly higher than those of control group, 300GAA group and 600GAA group (P<0.05); the nitrogen deposition rate of 900GAA group was significantly higher than that of the control group (P<0.05), but had no significant difference with 300GAA group and 600GAA group (P>0.05). 5) The uric acid content of 300GAA group, 600GAA group and 900GAA group was significantly higher than that of the control group (P<0.05), and the microbial protein (MCP) content of 900GAA group was significantly higher than that of control group, 300GAA group and 600GAA group (P<0.05). In conclusion, dietary appropriate level of GAA supplementation can improve the growth performance of lambs, improve the nutrient digestion and metabolism, and improve the energy and nitrogen utilization efficiency of lambs. Under the condition of this experiment, the dietary optimal supplemental level of GAA is 900 mg/kg.

Cite this article

LIU Xiaomei , HAO Xiaoyan , CUI Qiao , ZHANG Hongxiang , WU Ximing , GENG Haixia , ZHANG Hongliang , ZHANG Chunxiang , ZHANG Jianxin . Effects of Dietary Guanidineacetic Acid on Growth Performance and Nutrient Digestion and Metabolism of Lambs[J]. Chinese Journal of Animal Nutrition, 2021 , 33(12) : 6910 -6918 . DOI: 10.3969/j.issn.1006-267x.2021.12.032

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