What should be paid attention to when using calcium carbonate as feed
Different calcium sources should be reasonably matched: when the limestone particles were used as the calcium source, the laying rate was better than that of 3.75% of calcium, but the increase in the amount of calcium in the diet decreased by about 0.6 grams per day, with an increase of about 1%.To stabilize the content in calcium: phosphorus content only is sufficient, the content of calcium in the diet is as high as 6.5%, no adverse effect on egg production, but caused by rectocele, the effective phosphorus content of only 0.2%, 6.5% of calcium, the production performance decline, and increased mortality. Feeding low calcium diet (1.5%-1.8%), 24-48 hours, eggshell quality will decline.
Limestone with high magnesium content can not be used: because of the different origin of limestone magnesium content is not the same. The biological effectiveness of limestone is quite good. The biological availability of calcium 38%-40%, magnesium 0-0.3% limestone powder (gravel) can reach 91%-100%. Calcium 33%-37%, magnesium 0.4%-0.5% limestone, biological effectiveness of 70%-90%. The most influential factor was that the content of magnesium and magnesium increased by 1% and the efficiency of calcium decreased by 5%. Calcium containing 10%-12% magnesium dolomite, the biological effectiveness of calcium is only 51%-73%. However, the content of magnesium in limestone is not more than 0.5% as well, to reach the time of 1% is still available, more than 1.5% is absolutely not allowed to use.
To grasp the size of the size: in the United States, a variety of feed grade limestone product size range of 5-5600 microns. The retention time of egg laying hens in the gland and stomach was mainly determined by the size of limestone particles. Big time long, small time short. The egg laying hens were 3350 micron in size and the size of the hen was (1400-2000 microns), which was higher than that of the powder. It was found that, compared with the laying hens, the small size of the small particles of limestone in the hen digestion.
