Polymer material is a multi-phase composite system with polymer as the main body, that is, few products are made of pure polymer, and most of them are used together with Polymer Additives. The purpose of adding polymer additives is: 1. to meet the performance requirements; 2. to meet the molding requirements; 3. to meet the economic requirements. Polymer additives include plasticizers (DBP, DOP), phosphate esters (TCP trimethylphenyl phosphate), aliphatic dicarboxylic acids, lubricants, heat stabilizers, processing aids, reinforcing agents, toughening agents, curing agents, antioxidants, light stabilizers, fillers, solvents, foaming agents, and resistances. Propellant, coupling agent and antistatic agent.
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As the crossbreeding of Boer sheep is fully carried out, the number of hybrid sheep will be more and more, and in the future it may be used as the main commercial meat sheep. Therefore, the breeding and management of hybrid sheep should be studied. In the breeding and management of hybrid sheep should pay attention to the following points:
(1) Feed nutrients should be properly improved
As the hybrid sheep grow faster, especially after 6 months to 9 months after birth, the body weight can be double that of the local sheep. The demand for nutrients is also relatively high. It is necessary to make appropriate supplements on the basis of the local sheep's diet. The amount of supplements is generally based on the weight requirement and the resources of different seasons of green feed. Hybrid sheep born in spring are generally not allowed to feed at the other places except where the forage resources are properly supplemented before and after weaning and before going on the market. The hybrid sheep born in autumn and winter generally have to feed, otherwise it will affect the growth and development of the previous period, and the hybridization effect will not be obvious. In general, 0.5% to 1% of the weight of the hybrid sheep is supplemented with the supplemented concentrate.
(2) Strengthen management
In addition to doing a good job of daily routine management, we must timely castrate and periodically repel insects. After the castration, the sheep's temperament is docile, easy to manage, easy to fatten, and can reduce the smell and increase the quality of lamb. Lamb castration is usually about 2 months after birth. The de-worming work of hybrid sheep is very important. In the spring and autumn, the flukes and nematodes are driven once every two months. The maggots are driven once every two months. The parasites are driven once every spring, autumn and winter.
(3) Short-term fattening
To increase growth rate and lamb quality. Hybrid sheep can be fattened for a short period of time before the slaughter. According to the experience of pigs rearing hybrid sheep in Qinshui County, under normal grazing conditions, hybrid sheep of about 6 months of age supplemented with 150 grams of corn, 100 grams of bran, 50 grams of soybean meal and 3 grams of bone meal each day. After about one month of fattening, they can Weight gain 6 kg to 8 kg.
(4) Lambs listed during the year
The promotion of the lamb market this year is of great significance in reducing the need for winter and spring forages, avoiding “winter lean, spring death†and increasing commodity rates. The use of waves to provide more favorable conditions for the lamb market that year, hybrid sheep's early growth rate is particularly fast, generally 6 months to 9 months of age body weight can reach 35 kg - 45 kg. Even hybrid sheep born in the fall can grow to about 25 kilograms around 4 months of age as long as they strengthen nutrition and provide reasonable supplements.
(5) Using Additives
There are many kinds of additives, and their main functions are to supplement nutrients, promote growth, prevent diseases, and health care. The common additives for goats include mineral additives, rare earth Feed Additives, and insecticide-safe additives. According to reports, adding 0.02% rare earth to the diet of fattening sheep after weaning, the daily weight gain can be increased by 17.1% during the 60-day test period, and the feed conversion rate can be increased by 14.29%. Ruminin can promote propionic acid fermentation by changing the metabolic process and microbial activity in the rumen, thereby promoting weight gain and improving feed conversion. Ruminal is fed as feed additive and fed. Normally 25 mg to 30 mg per kilogram of diet is added, but be careful to stir well.
Breeding ewes feeding and management
The sheep from weaning to pre-breeding are called young sheep or bred sheep. This stage is the period when the sheep's bones and organs are fully developed. If the nutrient cannot keep up, it will affect the growth and development, the constitution, the feed intake, and the future reproduction ability. Strengthening cultivating can increase the physique and promote the development of organs. It plays an important role in improving the ability of using meat and enhancing reproductive performance in the future.