不同饲养方式对西门塔尔牛日增重及血清部分激素和神经递质水平变化的影响

试验旨在研究散栏与栓系两种饲养方式对西门塔尔牛生长过程中不同时期血清部分激素和神经递质水平变化的影响。选用50头体重相近(330kg左右)、月龄相同(12月龄)、未去势、健康无病的西门塔尔公牛,随机分为散栏组和栓系组,每组25头,分别于2012年10、11、12月及2013年1、2月进行体重及血清部分激素和神经递质水平的测定。结果表明,散栏组日增重在2012年11月显著高于栓系组(P0.05),在2012年12月及2013年2月极显著高于栓系组(P0.01)。散栏组血清部分激素水平中生长激素(GH)含量在2013年2月显著高于栓系组(P0.05);甲状腺素(T4)、睾酮(T)含量在2012年12月和2013年2月分别显著和极显著高于栓系组(P0.05;P0.01);生长抑素(SS)含量在2013年2月极显著低于栓系组(P0.01);雌二醇(E2)、促黄体素(LH)含量在2012年12月和2013年2月显著高于栓系组(P0.05)。散栏组牛血清部分神经递质中组胺(His)和5-羟色胺(5-HT)含量在2012年12月分别显著和极显著高于栓系组(P0.05;P0.01)。综上所述,随着年龄的增加,散栏饲养组牛血清中部分激素水平变化与日增重变化具有一定的相关性。与栓系饲养方式相比,散栏饲养方式较适合于提高西门塔尔牛的日增重。

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

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.