›› 2017, Vol. 29 ›› Issue (4): 548-554.DOI: 10.3969/j.issn.1004-1524.2017.04.05

• Animal Science • Previous Articles     Next Articles

Changes of GH, INS, HC, TGF-β1 and IGF-1 levels in cows’ serum during milk withdrawal period

SHEN Liuhong1, WU Xiaofeng1, XIAO Jinbang1, JIANG Sixun1, DENG Junliang1, ZUO Zhicai1, FU Hongqing2, CAO Suizhong1, YU Shumin1, *, ZHANG Yourui3   

  1. 1. The Key Laboratory of Animal Disease and Human Health of Sichuan Province, The Medical Research Center for Cow Disease,College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China;
    2. Jiangsu Agri-animal Husbandry Vocational College, Taizhou 225300, China;
    3. Agricultural Bureau of Langfang City, Langfang 065000, China
  • Received:2016-11-01 Online:2017-04-20 Published:2017-04-27

Abstract: In order to explore the changes and correlation among the levels of growth hormone (GH), insulin (INS), hydrocortisone (HC), TGF-β1 and IGF-1 in cows’ serum during the period of milk withdrawal. Twenty healthy Chinese Holstein cows in late pregnancy that gave (15.43±2.10) kg milk per day were used, which were ready to dry milk. The day when cows began to dry milk was recorded as the 0 d. The cows’ venous blood from the tail on the day 0, 1, 3, 5, 7, 9 and 11 were collected. ELISA was used to evaluate the levels of GH, INS, HC, TGF-β1 and IGF-1 in serum to analyze the changes and correlation among them. The results showed that, during the period of milk withdrawal, the changes of GH, INS, HC and TGF-β1 levels in serum were not obvious from the day 0 to the day 1 (P>0.05). The levels of GH and HC in serum were both on the decline and had significant difference from the day 3 to the day 11 (P<0.01), and the levels of GH in serum on the day 3 was significantly higher than those on the other days (P<0.01). The levels of INS in serum was on the rise and had significant (P<0.01) difference from the day 3 to the day 11, while the levels of TGF-β1 in serum had no significant (P>0.05) difference from the day 3 to the day 11. The levels of IGF-1 in serum showed downward trend in ladder type, and the difference among levels of IGF-1 in serum on the day 0 and day 1, day 3 and day 5, day 7 and day 9, day 9 and day 11 were not obvious (P>0.05), while IGF-1 levels among 0-1 d, 3-5 d and 7-11 d had significant (P<0.01) difference. There was significant (P<0.01) correlation among the levels of GH, INS, TGF-β1 and IGF-1 in cows’ serum separately during the period of milk withdrawal. The HC levels showed significant (P<0.01) correlation with GH, INS and IGF-1 levels, while it showed significant (P<0.05) negative correlation with TGF-β1 levels.

Key words: cows in milk withdrawal period, GH, INS, HC, TGF-β, 1, IGF-1

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