Research and analysis of mineral needs of gilts

The focus of many conference discussions tends to be on energy and protein, while minerals are often overlooked. However, their role is crucial, especially in modern pig breeding. As pigs are bred for lean meat, they become more bony and fragile, which significantly affects their performance. The number of sows has increased over the past 20 years, and this trend is expected to continue. Some sows now reach up to 14 piglets, with milk production increasing accordingly. The average lactation volume has reached 9 kilograms per day, which means the nutritional requirements have also changed dramatically. Currently, the elimination rate in pig farms is between 30% and 40%, and nutrition plays a major role in this issue. **I. Research on Mineral Needs of Gilts** 1. High-lean-meat pigs have lower calcium content compared to normal pigs. 2. Pigs with low or high lean meat rates require different calcium and phosphorus ratios. While muscle contains relatively little calcium, most of it is stored in bones. Therefore, high-lean-meat pigs tend to have a lower calcium-to-phosphorus ratio in their meat, though this ratio remains stable in bones. However, it can change due to genetic factors. 3. Sows have a particularly high demand for calcium; if not met, it can lead to early culling. 4. Calcium levels vary across different parts of the muscle, with higher concentrations found in the hind legs compared to the loin area. 5. High-lean-meat pigs require more trace elements than those with lower lean meat content. However, it's not about the amount fed but rather how much is deposited in the meat. 6. It's important to note that although bone development occurs earlier than muscle growth, calcium deposition happens later. This means that even if the bones are large, they may still be weak. For sows, premature farrowing can lead to early elimination, so careful management is essential. **II. Mineral Needs of Pregnant Sows** 1. The mineral deposition in the fetus mainly occurs between days 105 and 114 of gestation, during which calcium increases faster than phosphorus. 2. The condition of the hooves can indicate mineral deficiencies. A normal hoof has the secondary toe off the ground, with the back of the hoof at a 65-degree angle. In calcium-deficient sows, the secondary toe touches the ground, and the hoof angle becomes very small. At this stage, it's important to increase minerals in the feed. 3. To effectively supplement minerals, a balanced combination of vitamins and minerals should be used. Many companies use high doses of vitamin D, which temporarily mobilizes calcium from the sow’s bones, but this can accelerate her elimination. 4. Iron is another key mineral. Previously, it was thought that sows had difficulty transferring iron to the fetus, leading to iron deficiency in piglets. However, the real issue is insufficient iron intake overall. 5. There is a critical "window period" for mineral supplementation in pregnant sows. It's essential to identify and target these periods, as different minerals have different optimal times for absorption and utilization.

Eye Nut

The eye nut refers to the part that the nut and Bolt or Screw are screwed together to play a fastening role. It is an essential part for all production and manufacturing machinery. The lifting eye nut is a hanger commonly used in engineering. There is a screw thread under the nut, which can be drilled according to its different specifications and fixed by the screw mouth.

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