Why are calves not fed before weaning?
The cow is a ruminant. Its gastric structure is a multi-chamber stomach consisting of a rumen, a reticulum, a valve-stomach, and a stomach. When calves are born, the volume of the rumen is very small. The sum of the rumen and the reticulum is only equivalent to wrinkles. One-half of the stomach, and the structure is still not perfect, the mucosal papillae are soft, short, and small; yaks can hardly be ruminated at 1 to 2 months of age, and at 3 to 6 weeks of age, the rumen begins to appear Normal microbiological activity begins with rumination at 3 to 4 months of age, and complete digestive function is established at 6 months of age.
General yak's sulcus groove is more developed, can be closed into a tube, so that the liquid chyme directly along the sulcus and valve stomach straight abomasum, without rumen digestion, directly to the abomasum, this time only in the abomasum Exercising the function of the stomach, the digestion and absorption of food is completed by the abomasum and the small intestine.
Digestion of forage by cattle is based on rumen microbes that ferment and decompose crude fibers. Before the calf was weaned, the stomach was in motion, and the microbe population in the rumen had not yet been established. Therefore, the fodder could not be digested at all.
Too early herbivore feeds no benefit to the rumen development of the yaks. The forage can only act as a rubbing effect on the rumen wall in the rumen. If the food is eaten with poor quality, it will also cause damage to the rumen of the calf.
The correct method is to have a reasonable weaning time for the feeding of yaks, so that the rumen mucosal nipples are healthy and developed. After weaning, they can feed high-quality hay, and it is best to feed more plant-based feeds. It is because plant-based rearing can promote the growth and development of the rumen, and the growth and development of the rumen can also promote the digestion and utilization of plant-derived feed. It will lay a solid foundation for the cultivation of high-yielding dairy cows in the future.
Analytical chemistry is a science that studies and identifies the composition, state, and structure of substances and studies the methods and principles of determining the content of related components. It is an important branch of chemistry. Analytical chemistry plays an important role not only in the development of chemistry itself, but also in various fields related to chemistry. It can be said that any practical activities involving chemical phenomena are inseparable from analytical chemistry. Now, many different analysis methods have been developed, and these analysis methods can be classified according to the analysis task, analysis object, analysis basis, analysis requirements and sample amount.
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