| Inner Mongolia Cashmere Goats are obviously different in hair coat length. In this paper, based on the preliminary statistical analysis on staple length record in Inner Mongolia Cashmere Goats breeding farm, has scored the Cashmere goat in terms of staple length measurement, and divided into nine groups.An analysis of variance and multiple comparisons of staple length of Inner Mongolia Cashmere Goats on their other economic important traits showed:Inner Mongolia Cashmere Goats staple length has a very significant effect (P<0.001) on each economic traits. Among them, effect of staple length on body weight after the fleece was not significant between groups 3,4,5,and the other groups were significantly different; for fleece thick except there was no significant difference between groups 3 and 4, the other in each group there are significant different. In cashmere yield, individuals of 7 to 9 groups has a maximum cashmere yield, individuals of 1,2,3 group cashmere yield is less than the 7-9 group, but higher than the 4-6 group. Thus the individuals of 4-6 groups have the lowest Cashmere yield. In addition, the fiber length between 3-5 and 7-9 is not significantly different, but there are significant differences between the other groups. However, for fiber fineness, except a significant difference between the two extremes score, there was no significant difference between the other groups.Considering the above analysis, the Inner Mongolian cashmere, according to their staple length, is divided into:long-haired type (7,8,9), short-haired type (1,2,3) and intermediate type (4,5,6).Chi-square test compared different models (whether to consider the type of hair coat as a fixed effect) to estimate the genetic parameters of Inner Mongolia Cashmere Goats, shows that, the hair coat should be considered as a fixed effect to the genetic parameter estimation process.By nonlinear regression analysis, estimate the linear and quadratic regression coefficients of staple length on the other economic traits show that:staple length showed a nonlinear relationship with cashmere yield and weight after fleece, and to fiber thickness, and fiber length was a simple linear relationship.Through a systematic study of the genetic pattern of Inner Mongolian cashmere goat, come to the following rules:When parents are both short-haired type, offspring has a shortest staple average, and when the parents are both long-haired, their offspring staple has the highest average length; while the type of Rams are the same, with longer hair coat of dam, the longer staple is the offspring is. Similarly, the offspring of the same hair coat type of dam, staple goes longer when the ram hair coat length increase; The average staple length of offspring from long-haired dam and intermediate type ram is only preceded by the offspring from those both long-haired parent (19.75 cm), this value is higher than the average of the offspring from long-haired ram and intermediate type dam. Offspring of parents both with Long-haired have a certain amount of short-haired offspring, while with parents were both shorthair type, the offspring is relatively rare long-haired types. No matter what type of combination, the proportion of the most offspring was intermediate-haired cashmere goats, and the extreme type of individual was minority. It may be due to that the genes controlling hair coat length is located on the autosomes and a number of major genes or QTL joint action on the basis of the presence of several minor genes on and does not conform entirely between dominant and recessive genes. And intermediate is the result of heterozygous. |
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