First, the growth and development of meat pork pigs is the early growth is slower, medium-term weight gain faster, late fat deposition faster. Under normal circumstances, 20-30 kg of fattened pigs are the peak period of bone growth, 60-70 kg are the peak of muscle growth, and 90-100 kg are the peak of fat accumulation. The weight gain has a lot to do with changes in the variety and nutritional level. The peak period of muscle growth of the breed pig is about 50 kg (3-4 months old), and with the increase of age, it is 70-80 kg (4-5 months old). After that, the strength of fat growth has increased significantly and gradually exceeds the intensity of muscle growth. The body begins to deposit a large amount of fat. The slaughter benefit is best when the weight reaches 90 kg. Local precocious varieties are most suitable for slaughter when they weigh about 75 kg. At this time, the meat quality is good, and the slaughter rate is also high; the slaughter rate is 7- to 8-month-old (90 to 100 kg) for the binary or triple crossbred pigs that use the local pig as the female parent and the male lean pig as the parent. optimal. Second, the daily gain of beef, beef, and beef is faster and slower with age. Bulls generally grow faster than their calves, and calves grow faster than cows of the same breed. Different feeding methods have different weight gains: In the case of house feeding, young calves gain weight faster than calves and heifers, and they have good meat quality and low feed consumption. In free-range breeding, the calf's weight gain and feed repayment are relatively reduced, while the young female calf and calf's weight gain is faster, and the fat and meat are more tender, but feed consumption is more. Compared with free-range feeding, the daily weight gain increased by 19.6%, feed consumption decreased by 26.3%, and weight gain cost decreased by 19.6%. Beef cattle fattening, in the vigorous growth period of 10-18 months, through the use of matching feeding techniques for 80-150 days of concentrated fattening, when the weight reached 450-500 kg, the best slaughter benefit. The fattening of old cows can only allow them to recover the public opinion in the short term, and it is impossible to have greater weight gain and the benefits are relatively poor. Experiments show that calves in the first 6-8 months after birth, the fastest growing muscles, and later with the increase in body weight and age, muscle growth slows, feed utilization rate gradually decreased. In the latter half of the growth period, the weight of beef increases by 18% for every 100 kilograms of body weight, 42% for every 100 kilograms at 2 years old, and 60% for every 100 kilograms at the age of 3. Therefore, the best economic benefits for the hybrid cattle at 1.5-2 years of age. Third, the production of meat mutton sheep is mainly based on grazing, but also can be fed. Sheep are fast growing from birth to 12 weeks. It has been determined that sheep can grow at a daily weight gain of 170 grams during the period of rapid growth, a sustained increase during 12-30 weeks, and an increase of 135 grams per day. The cumulative growth is still on the rise. Most of the sheep gained the fastest weight at 7-9 months of age. Sheep gained about 40 kg in 9 months and about 35 kg in meat goats. Therefore, we should grasp the early growth of mutton sheep. Fourth, the hybrid dog improved the use of captive breeding methods, because the meat dog activity is small, less energy consumption in the body, generally fattening to 4 months of age, weighing about 20 kilograms, you can slaughter. At this time, the meat dog grows fast, the feed conversion rate is high, and the meat quality is good. If the feeding time is too long, the slow growth of the meat dog is not effective. China Agricultural Network Editor
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