›› 2015, Vol. 42 ›› Issue (5): 1173-1179.doi: 10.16431/j.cnki.1671-7236.2015.05.021

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The Influence of Castration on Growth Performance of Simmental Cattle Aged from 17 to 21 Months

GUO Tong-jun1,2, ZANG Chang-jiang1, WANG Lian-qun3, HE Zong-lin4, SANG Duan-ji2, SHAO Wei1, YU Xiong1   

  1. 1. Xinjiang Key Laboratory of Herbivore Nutrition for Meat & Milk Production, College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    2. Institute of Feed Research, Xinjiang Academy of Animal Science, Urumqi 830000, China;
    3. College of Animal Sciences, Tarim University, Alar 843300, China;
    4. Aksu Center for Disease Control and Prevention, Aksu 843000, China
  • Revised:2015-04-10 Online:2015-05-20 Published:2015-06-02

Abstract: The objective of the present study was to investigate the influence of castration on daily gain and body size of Simmental cattle.50 healthy Simmental cattle (16 month) were used in a paired design of single factor by body weight.The results showed that 17 to 21 months of age, body weight and the average daily gain of castrated groups were lower than uncastrated group, respectively, there were no significant difference (P>0.05).17 to 21 months of age, body height, body length, chest circumference and hip width's length and month growth of the castrated group and uncastrated group, were all no significant difference (P>0.05).The first months after castration (17 month of age), body height, hip width and ischial-end width's month growth of castrated group were extremely significantly less than uncastrated group (P<0.01).17 to 19 months of age, ischial-end width of castrated group was significantly less than uncastrated group (P<0.05).The whole period of average month increase of abdominal perimeter, castrated group was more than in uncastrated group (P<0.01).The results suggested that the whole period of average daily gain of castrated Simmental cattle was less than uncastrated.The growth curve of castrated Simmental exponential was exponential curve, and uncastrated Simmental was "S".Inhibated the growth of body height, hip width and ischial-end width shortly after castration.The castrated would improve Simmental abdominal perimeter growth.Simmental body size at the age of 1.5 was close to the adult body size.

Key words: castration; Simmental cattle; body weight; body size

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