Sample sack for measuring dry matter degradation rate of fodder in rumen and application method thereof

Abstract

The invention provides a special sample sack for measuring dry matter degradation rate of fodder in a rumen of a ruminant and a convenient measuring method. The convenient measuring method comprises putting a certain amount of smashed fodder samples to be measured into the sample sack, putting the mechanically-sealed sample sack into a rumen of a ruminant for digestion for a certain time and taking out the sample sack, directly washing the sample sack, drying and weighting the sample sack, and calculating the dry matter degradation rate of the fodder in the rumen. The convenient measuring method is simple and fast in operating steps, good in repeatability and high in accuracy and is a simple and efficient method for evaluating nutritive values of the fodder of the ruminants.

Description

technical field [0001] The invention relates to the field of feed nutritional value evaluation, in particular to a sample bag for measuring the degradation rate of feed rumen dry matter and an application thereof. Background technique [0002] The rumen is the first stomach of ruminants such as cattle and sheep. The feed eaten by ruminants first enters the rumen. In the rumen, the feed has gone through the processes of rumen fluid moistening, cutting, physical mixing and rumen microbial fermentation. The macromolecules in the feed It is degraded into small molecular substances, absorbed and utilized by animals or excreted from the body. Therefore, to evaluate the nutritional value of ruminant feed must understand its degradation performance in the rumen. [0003] The rumen dry matter degradation rate of the feed refers to the disappearance rate of the dry matter of the feed in the rumen of ruminants for different periods of time. It can calculate the fast degrading componen...

AI Technical Summary

Problems solved by technology

[0005] However, the in-situ nylon bag method has the following problems: (1) The operation steps are complicated and the errors introduced are large

The currently used nylon bag material has poor heat resistance and cannot be used for constant weight at the feed dry matter measurement temperature (105°C). Therefore, the dry matter (105°C) must be measured separately before the feed is digested, and the weight should be kept at 65°C after the feed is put into the nylon bag. ;After digestion, the bag and residue should be kept at 65°C for constant weight, and then the degraded feed residue should be taken out from the bag to measure the dry matter (105°C, constant weight). Multi-step transfer and operation will introduce greater measurement errors

For the feed with a high degradation rate, after a certain period of rumen degradation, the remaining residue is very small, and it is difficult to completely recover the residue, resulting in the inability to measure

(2) Manual sealing, time-consuming and low sealing, easy to cause feed loss

The currently used nylon bags need to be manually tied with threads after being loaded into the feed, and mechanical sealing cannot be used, which requires more labor

Binding with wires sometimes leads to off-lines, causing feed outflow and unreliable measurement results

(3) Large washing loss

The nylon bag method determines the high washing loss of some powder materials, resulting in an overestimation of the rumen degradation rate of feed materials, which seriously limits the scope of application of the method (Liang Yi. Effects of palm kernel meal addition level on rumen degradation and fattening characteristics of beef cattle diet [D]. Beijing: China Agricultural University, 2008: 16-21)

(4) There is no unified commercial product, the results of different researchers are not comparable, and the sharing and application of results are limited

At present, the nylon bags used by various researchers are all made by themselves based on reference materials. It is difficult to be completely consistent in terms of materials and specifications, resulting in poor comparability of the results of different researchers and difficult to repeat.

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