| The Jianzhou flap-eared goat is the second new breeds for meat goat in China. We used the ASReml 3.0 software to estimate the genetic parameters of growth traits and reproductive traits of the Jianzhou flap-eared goat at the age of two-month, four-month, six-month, eight-month, twelve-month (one-year) and thirty-month (adult), according to the breeding materials of Jianzhou flap-eared goat in 2003-2011. The growth traits include weight (WT), body length (BL), height (HT), chest girth (CG), cannon circumference (CC) and ear length (EL). The reproductive traits include litter size (LS) and litter weight (LW). Main growth and reproductive traits for each generation in both gender are compared by using SAS 8.1 software. The correlations of some growth traits for each generation are analyzed and the fitting degree of growth corves of rams and ewes for each generation setting up by different models are compared with each other. The results are as follows,(1) The heritability of two-month chest girth (2CG), four-month chest girth (4CG), two-month cannon circumference (2CC), four-month cannon circumference (4CC), six-month cannon circumference (6CC), eight-month cannon circumference (8CC), one-year cannon circumference (YCC), adult cannon circumference (ACC), two-month ear length (2EL), four-month ear length (4EL), six-month ear length (6EL), eight-month ear length (8EL), one-year ear length (YEL) and adult ear length (AEL) are 0.4683,0.4655,0.6197,0.5975,0.6193,0.5743,0.6327,0.6070,0.6401, 0.5957,0.6598,0.6216,0.6531 and 0.5546, respectively, suggesting that they are high heritable characters. The heritability of two-month weight (2WT), four-month weight (4WT), eight-month weight (8WT), two-month body length (2BL), four-month body length (4BL), six-month body length (6BL), eight-month body length (8BL), adult body length (ABL), two-month height (2HT), four-month height (4HT), eight-month height (8HT), one-year height (YHT), adult height (AHT), six-month chest girth (6CG), eight-month chest girth (8CG), one-year chest girth (YCG), adult chest girth (ACG) and litter size (LS) are 0.3673,0.2506,0.2223, 0.3146,0.3575,0.2187,0.3405,0.2664,0.3244,0.2715,0.3352,0.3880,0.3044, 0.3307,0.3263,0.2284,0.2447 and 0.2218, respectively, suggesting that they are middle heritable traits. The heritability of six-month weight (6WT), one-year weight (YWT), adult weight (AWT), one-year body length (YBL), six-month height (6HT) and litter weight (LW) are 0.1106,0.1121,0.1258,0.1364,0.1815 and 0.1206 respectively, suggesting that they are low heritable characters.(2) The genetic correlation coefficients of WT, HT and CG between each month are all above 0.75,0.71 and 0.67, respectively, within eight-month old. The genetic correlation coefficients of BL between each month within one-year old is above 0.76. The genetic correlation coefficient of CC between each month is above 0.93. The genetic correlation coefficient of EL between each month within one-year old is above 0.92 and the genetic correlation coefficient between each month and adult period also is above 0.73.(3) Each main growth characters and the first three parity litter weight of the fourth generation showed growth trend in comparison with the second generation. Moreover, the fourth generation grow faster in weight compared with the second generation in the period of six to eight month and one year to adult old in both rams and ewes.(4) Correlation analysis of the WT, BL and HT at various stages showed highly significant positive correlation. The fitting degree of weight growth rate for the Jianzhou flap-eared goat has a highest value when setting up with power function model. |
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