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Acta Prataculturae Sinica ›› 2015, Vol. 24 ›› Issue (2): 168-175.DOI: 10.11686/cyxb20150219

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Effects of ryegrass on growth, carcass traits and blood biochemical indices of Yangzhou geese

ZHAN Jinshun, XIA Chen, LIU Sujiao, ZHOU Meilin, YANG Hongbo, LIN Miao, LIU Mingmei, ZHAO Guoqi*   

  1. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
  • Received:2013-12-31 Online:2015-02-20 Published:2015-02-20

Abstract: The objective of this study was to investigate the effects of different proportions of ryegrass meal in pelleted feed on the growth, carcass traits and blood biochemical indices of Yangzhou geese. 300 healthy geese with similar hatch times and hatch weight were randomly divided into 5 groups (control group and trial groups Ⅰ-Ⅳ); each group consisted of 20 geese with 3 replicates. The control group was feed with a basal diet without ryegrass, while trial groups Ⅰ-Ⅳ were feed pelleted feed containing 8%, 12%, 16% and 20% ryegrass respectively. The trial lasted for 21 days, after which all geese were slaughtered and assessed. Average daily weight gain of the trial groups was significantly higher but feed intake/unit weight gain significantly lower than the control group (P<0.05). The average daily feed intake of groups Ⅱ and Ⅳ was significantly lower than other groups (P<0.05). There were no differences in slaughter live weight, carcass traits, leg muscle weight and leg muscle ratio among the five trial groups, but the slaughter weight of groups Ⅰ and Ⅱ were significantly lower than remaining trial groups (P<0.05).The semi-eviscerated weight, eviscerated weight, eviscerated ratio, semi-eviscerated ratio, breast muscle weight, breast muscle ratio and tibia weight of group Ⅲ were significantly higher while the abdominal fat weight and the abdominal fat ratio were significantly lower than other groups (P<0.05). Heart, spleen, liver, stomach, pancreas and thymus weights of all experimental groups were higher than the control group. Total protein and high density lipoprotein in the blood serum of group Ⅲ, and the contents of glutamic oxaloacetic transaminase of group Ⅰ and Ⅳ were significantly higher than the control group (P<0.05).Triglyceride, cholesterol and low density lipoprote in content in the serum of group Ⅲ and the blood glucose and glutamic-pyruvic transaminase content in the trial groups were significantly lower than the control group (P<0.05). Alkaline phosphatase was not affected by the feeding regime. It was concluded that growth, carcass traits and blood biochemical composition of Yangzhou geese was improved by including ryegrass in the diet; the optimum proportion in feed was 16%.