The growth characteristics of different types of pigs today are the result of more than 30 years of research, breeding, and breeding work by related practitioners, so that different types of pigs have a growth rate suitable for their own needs during the feeding process. The goal of raising pigs is to maximize their muscle growth while limiting their fat deposition, and to improve the quality of their ketone bodies at the lowest possible ratio of feed to meat. However, if the gilts are still raised with the above-mentioned hog feeding targets, it is completely unworkable.
Daily gain <500 g / day = affecting estrus quality
The daily gain is too low. If the gilt weighs less than 120 kg at 7-8 months of age, it will make it harder to get into the group and it will be more difficult to have problems in the production cycle.
Daily gain >800 g / day = damage to the hoof
If the weight gains too fast, the growth of the hoof will not be able to keep up, which will result in it failing to meet the requirements of the hoof, which will increase the risk of premature elimination.
Regular + moderate adjustment of the amount of material
The feed should be less than 10-15% of the free feed intake. If the amount of material supplied is harsh, it will cause sexual maturity to be delayed for a few days or even weeks. The adjustment of the amount of work must be carried out regularly at various stages of growth. In the case of the same average consumption, if the gilts are fed with a heavier period and fed in a free-feeding mode in the medium term, the quality of the gilts raised is not high.
Similarly, after the feeding period is too free to feed, do not try to limit the feeding in the pre-group stage. Otherwise it will reduce the quality of estrus and fertilization performance.
The growth period is too thin = the group is too thin
We often find that gilts are too thin in the late stages of their growth and are usually very thin when they enter the group and give birth. If the gilts are not enough energy storage (reciting) during childbirth, even if they supply a higher amount during the lactation period, they will have difficulty producing enough milk, which makes it difficult to bring out heavier piglets during weaning.
The amount of 30 to 110 kg should match the type of sow: during this period the daily gain is 650-750 g/day (day-to-day gain is 550-650 g/day during birth to 100 kg). At the same time, consideration should be given to the impact of the feeding environment such as ground type, environmental control, etc., because these factors will affect the sow movement, so that their energy needs are different.
The feed plan can be based on the historical data of the farm, or it can be determined by using the data collected from experiments on the animals as a reference standard. The latter can model changes in appetite based on age or weight and derive a feeding plan. Parental sows and maternal castrated boars are generally used as research objects. The difference in feed consumption between sows and castrated boars in the growing season is not stable, but the consumption of different varieties is also different: the difference is 12% when the body weight is 25 kg, and the difference is only 4% when the body weight is 115 kg.
High quality gain
Hog feed is not suitable for feeding gilts. This feed formulation requires adjustment of the balance between digestible amino acids and net energy to cover the needs of the muscle production of the hog. Feeding this feed to gilts greatly limits their fat deposition and limits muscle production to a lesser extent. Although the growth rate of gilts is relatively slow, it should not affect the deposition of fat.
Feed during pregnancy is not suitable for gilts. Feed is usually rich in fiber during pregnancy. However, the gilt esophagus cannot digest these fibers as well as the sows. Therefore, if the sows need to have a net energy content of 9 MJ, the corresponding pregnant gilts need a net energy content of less than 8.7 MJ. For example, if the feed contains 5 grams of digestible lysine per kilogram of pregnancy, it means that the feed contains 0.6 grams of lysine per megajoule of energy, which is not enough to ensure the ovulation rate of the gilts with high productivity. .
The minimum digestible lysine content of 0.75 grams of digestible lysine per 0.7 megagrams of net energy (0.75 g / MJ EN) is technically and economically a reasonable target value for good estrus and Better ovulation rate. Other essential amino acids should be added proportionally to lysine to meet the desired protein and mineral content. The choice of nutrient levels in gilts depends directly on the growth target (energy intake) and weight gain composition (amino acid intake).
Reserve sow feeding tips
Is the gilt full-loaded with the squid still keeping it physically strong?
The one-child sow in the birthing house is usually very busy. Because their nipples are smaller, they are better for feeding smaller piglets. Numerous studies have shown that if the gilts are able to fully use their nipples during the first lactation, the breasts produce more milk in subsequent production cycles. However, excessive consumption of stored fat will affect its useful life. We will consider taking the gilt full load strap if and only if no other solution can be used to ensure the feeding and survival of the piglet.
Sow is very thin
For slow-growing sows (some Pietrain types), it is reasonable to use high-energy, low-amino acid feeds. In the early stages of the growth phase, gilts can consume more energy, and slightly lower than the amount of amino acids they need will facilitate fat deposition.