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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (6): 219-226.DOI: 10.11686/cyxb2023252

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Effects of dietary energy levels on testis development and the expression of related genes in sheep

Pei-di ZHAO1(), Ke YANG1, Yu-qi JIANG1, Ke-pan HUANG1, Ming-yu MA1, Kai-dong LI3, Hui XU4, Wan-hong LI1,2()   

  1. 1.National Demonstration Center for Experimental Grassland Science Education,College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China
    2.State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,Key Laboratory of Grassland Livestock Industry Innovation,Ministry of Agriculture and Rural Affairs,Lanzhou University,Lanzhou 730020,China
    3.Animal Husbandry Technology Promotion Station of Minqin County,Minqin 733300,China
    4.Minqin Defu Agricultural Technology Co. ,Ltd,Minqin 733300,China
  • Received:2023-07-19 Revised:2023-11-03 Online:2024-06-20 Published:2024-03-20
  • Contact: Wan-hong LI

Abstract:

We investigated the effect of dietary energy levels on testicular development in sheep during the pre-puberty stage. Forty-five 3-month-old merino lambs with similar body weight [(24.27±0.63) kg] were randomly divided into three groups; namely high (10.5 MJ·kg-1), medium (10.1 MJ·kg-1) and low (9.7 MJ·kg-1) energy level groups. After a feeding period of 104 days, 10 lambs were randomly selected from each group for slaughter, and their testicular size, total antioxidant levels in testicular tissue, glutathione peroxidase activity, and testosterone levels were measured. The transcript levels of genes related to energy metabolism and steroid hormone synthesis were detected by RT-qPCR. The results indicated that the diets with different energy levels did not significantly affect body weight (51.73±0.56 kg, 50.69±0.55 kg and 51.51±1.03 kg for high, medium and low energy level groups, respectively), testicular weight (253.60±19.69 g, 274.60±14.17 g and 262.40±19.91 g, respectively), total antioxidant level (10.59±1.13 U·mg-1 prot, 8.60±1.00 U·mg-1 prot and 7.86±1.73 U·mg-1 prot, respectively), glutathione peroxidase activity (0.28±0.08 U·mg-1 prot, 0.14±0.03 U·mg-1 prot and 0.23±0.03 U·mg-1 prot, respectively), or testosterone level (0.52±0.07 ng·mg-1 prot, 0.35±0.05 ng·mg-1 prot and 0.44±0.06 ng·mg-1 prot, respectively) in testicular tissue (P>0.05). However, the transcript levels of the metabolism-related genes IGF-1R and IGF-1 and the steroidogenesis-related genes CYP19A1 and 3βHSD were significantly higher in the middle energy level group than in the other two groups (P<0.05). In summary, dietary energy levels potentially affect testicular metabolic activity in sheep. Feeding lambs with a middle energy level diet during the pre-puberty stage promoted the expression of metabolism- and steroidogenesis-related genes, but did not significantly affect testicular development.

Key words: energy level, fertility, testicular development, puberty