ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (6): 1112-1123.doi: 10.11843/j.issn.0366-6964.2016.06.005

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The Comparison of Growth Patterns of Body Weight,Breast Muscle and Leg Muscle between Different Duck Breeds via Growth Models

LIU Hong-xiang,SONG Wei-tao,HU Yan,SONG Chi,SHU Jing-ting,JI Gai-ge,LI Hui-fang*   

  1. (Jiangsu Institute of Poultry Sciences,Yangzhou 225125,China0
  • Received:2015-10-15 Online:2016-06-23 Published:2016-06-23

Abstract:

In order to understand the development pattern of body weight and skeletal muscle of ducks,this experiment was conducted to compare the difference of growth traits about body weight,breast muscle and leg muscle between different duck breeds.The body weight,pectoralis major (PEM) weight and gastrocnemius (GAS) weight for 20 Gaoyou ducks (GYD) and 20 Jinding ducks (JDD) at day 0,4,8,12,16,20,24,28,35,42,49,56,63 and 70 were determined,respectively.The data was used to compute and compare the accumulate values,absolute values and relative values between GYD and JDD.Three models of Gompertz,Logistic and Bertalanffy were used to fit growth curves of body weight,PEM weight and GAS weight for the 2 breeds.The inflection day (ID) and weight gain at inflection (WGI) was calculated from parameters of the models.The results showed that:1) Body weight and GAS weight of GYD were significantly higher than that of JDD at the incubation period,and PEM weight of GYD was remarkably higher than that of JDD from day 4 to 70.The body weight,PEM weight and GAS weight of GYD were 1.41 times,1.50 times and 1.20 times of JDD,respectively from day 28 to 70.2) All the growth speeds of body weight,PEM weight and GAS weight of GYD were faster than that of JDD,but the maximum growth speeds day of the 3 traits are identical between the 2 breeds,which were day 20 for body weight,day 56 for PEM weight,day 20 for GAS weight.3) The body weight growth intensity of GYD was higher than that of JDD,while the growth intensities of PEM weight and GAS weight were less than that of JDD during stage of day 0-16 via analysis of fitting data.From then on,however,the growth intensities of the 3 traits approached to be identical between the 2 breeds.There was no significant difference between the 2 breeds in the varying pattern of growth intensity of body weight,PEM weight and GAS weight.4) The inflection day of PEM weight (52 day both for the 2 breeds) were far latter than that of GAS weight (16.5 day both for the 2 breeds).The growth intensity of PEM weight was less than that of GAS weight before day 16,and from then on,it was higher than that of GAS weight.During the stage of day 0-28,the growth intensity of PEM weight decreased slowly and then rapidly.In contrast,the growth intensity of GAS weight decreased rapidly and slowly from day 0 to 28.At the growth stage of day 28-70,the breast-body index of GYD was higher than that of JDD,while the leg-body index was significantly less than that of JDD.These results showed a stronger growth intensity of PEM than that of GAS during day 28-70.Under the identical growth condition,there is no significant difference between breeds as to the duck growth pattern of body weight,PEM weight and GAS weight.However,there are significant differences between breast muscle and leg muscle,breast muscle growth slower than leg muscle at early while faster at later,and breast muscle contributed more than leg muscle to meat performance.

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