[Objective] The paper was to explore the microscopic structure of rabbit hair.[Method] Single rabbit hair with typical features was selected to observe its microscopic structure from tip to root,and its fiber diameter was also measured.[Result] The rabbit hair tip was constituted by scale layer and cortical layer,without medullary layer;the middle part was generally constituted by scale layer,cortical layer and medullary layer;the root had no medullary layer,and the scale layer was wheatear-shaped.This was the property of rabbit hair,which could be used for comparative studies with other animal fiber and species identification.Rabbit hair had developed medullary layer,and fiber diameter was positively related to column number of medullary cavity.The hair generally was single column,and coarse hair was multi-column.Single rabbit hair was the finest in the tip,coarse in the middle and tapering in the root.The diameter difference of various parts was large,the external growth characteristics was spindle-shaped.[Conclusion] Using biological microscope method to identify different animal fur and product species is more objective and simple.
Degradation rate of feed proteins in rumen is a basic indicator of new intestinal protein system of ruminants. In this paper, determination methods of degradation rate in rumen including in-vivo method, nylon bag method and artificial rumen method are compared in order to provide a reference for animal nutrition.
Yak is the rare breed of resources in the world.Yak products include meat,milk,bone,horn,hair,fine hair and so on.The current situations of yak in China were reviewed.The development and utilization of yak products were analyzed.The countermeasures for speeding up the development of yak products were put forward.
Shrinkage temperature of leather is one of important guidelines to test the durability of leather production. When the determination criterion of the shrinkage temperature of leather is carried out,we find that there is too many problems. Instrument structure,measurement method and gist of judgement were analyzed and considered to solve these problems.
To observe the ultrastructure from four kinds of rabbit fibers,the hairs and villus of hare,Angola rabbit,Rex rabbit and rabbit were used as the experiment materials,and scanning electron microscopy was used to observe their scale structure.The results showed that there was no significant difference(P0.05) in the rake angle of hairs between rabbit and Angola rabbit,and a significant difference(P0.05) compared with the Rex rabbit,and no significant difference(P0.05) in the rake angle of villus between rabbit and Angola rabbit.There were highly significant differences(P0.01) in the scale height of villus and hairs from Angola rabbit compared with the other three kinds of rabbits,and no significant differences(P0.05) compared with each other among the other three kinds of rabbits.There were highly significant differences(P0.01) in the scale thickness of villus from Angola rabbit compared with the other three kinds of rabbits,and significant differences(P0.05) among hare and the other two kinds of rabbits,and no significant difference(P0.05) between Rex rabbit and rabbit.The results from energy-dispersive X-ray spectroscopy revealed that there were no significant differences(P0.05) for the content of C element in the hairs and villus from all four kinds of rabbits,and significant differences(P0.05) for the content of O element in the hairs from Angola rabbit compared with the other three kinds of rabbits,and no significant differences(P0.05) compared to each other among the other three kinds of rabbits.The contents of S element were lower in the hairs from hare and rabbit,and there were significant difference(P0.05) compared with other two kinds of rabbit,and no significant differences(P0.05) compared to each other between other two kinds of rabbit.There were significant differences(P0.05) or highly significant differences(P0.01) for the content of Ca element in the hairs and villus from all four kinds of rabbits.It indicates that the fibers from different animals had some unique morphological characteristics and obvious differences on their inner ultrastructure.It provides a reliable basis for the discrimination of different fibers and distinguishing of the generic term for animal.
[Objective] To analyze the hair and villus production performance of Tianzhu white yak and thus provide conditions for the genetic breeding and product development. [Method] The hair and villus yield as well as villus rate of male and female Tianzhu white yaks from one year to six years old was detected and the villus yield was also determined. And these indexes of hair and villus were analyzed to evaluate the production performance. [Result] In Tianzhu white yaks from one year to two years old, the hair and villus yield was lower, but the villus rate and yield were higher. The hair and villus yield, villus rate, and villus yield were all higher in Tianzhu white yaks from three years to six years old but significantly decreased in 7-year-old Tianzhu white yaks. In addition, the hair and villus yield was significantly (P0.05) or very significantly (P0.01) higher in male yaks than in female yaks. The villus rate was very significantly (P0.01) higher than in female yaks from five years to seven years old than in male yaks at the same age. [Conclusion] Tianzhu white yaks from one year to two years old have the best hair and villus production performance; Tianzhu white yaks from three years to six years old are in the main phase of hair and villus production; Tianzhu white yaks older than seven years old should not be used for hair and villus production.
Hazard of colorful medullary fiber among white wool and advancement of its detecting technology have summarized,at the same time the mechanism of forming colorful medullary fiber have been analyzed,and some corresponding control measures have been put forward about it.
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