›› 2015, Vol. 42 ›› Issue (3): 597-604.doi: 10.11843/j.issn.1671-7236.2015.03.014

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Effect of Different Feeding Conditions on Daily Gain and Some Serum Hormone and Neurotransmitter Levels in Simmental Bulls

AYINUER Tuoheti1, HE Zong-lin2, ABULIZI Wusiman1, YU Xiong3   

  1. 1. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    2. The Centers for Disease Control and Prevention of Aksu City, Aksu 843000, China;
    3. Xinjiang Key Laboratory of Herbivore Nutrition for Meat & Milk Production, Urumqi 830052, China
  • Revised:2014-09-22 Online:2015-03-20 Published:2015-03-30

Abstract: The experiment was aimed to study the influence of free-stall and tie-stall feeding modes on growth of Simmental bulls in different stages for some serum hormones and neurotransmitters levels.Select 50 Simmental bulls with healthy,not castrated,similar weight (330 kg) and age (12 months old),and divided them into free-stall and tie-stall groups of 25 bulls each.The experiment was starting from October 2012 to February 2013.Measured body weight and size,and take blood samples 5 times for some serum hormone and neurotransmitter levels in one month intervals.The results showed that the daily gain of free-stall group was significantly higher than that of tie-stall group in November 2012 (P <0.05),and extremely significantly higher than that of tie-stall group in December 2012 and February 2013 (P <0.01).The serum hormone content of GH in free-stall group was significantly higher than that of tie-stall group in February 2013 (P <0.05).The serum content of T4 and T in free-stall group were significantly and extremely significantly higher than that of tie-stall group in December 2012 and February 2013 (P <0.05;P <0.01),respectively.The serum content of SS in free-stall group was extremely significantly lower than that of tie-stall group in February 2013 (P <0.01).The serum content of E2 and LH in free-stall group was significantly higher than that of tie-stall group in December 2012 and February 2013 (P <0.05).The serum content of His and 5-HT in free-stall group was significantly and extremely significantly higher than that of tie-stall group in December 2012 (P <0.05;P <0.01),respectively.In conclusion,with the increase of age,there were some correlation between the changes of some serum hormone levels and daily gain.Therefore,compared with the tie-stall feeding management,the free-stall feeding modes more suitable for improving the daily gain in Simmental bulls.

Key words: free-stall; tie-stall; hormone; neurotransmitter; daily gain

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