Limousin cattle
Limu Zan cattle is produced in French persuasion, which was introduced in our country in 1974 and distributed in the north of China.
Limousin cattle is produced in France. It was introduced into China in 1974 and distributed in the north of China.
Limuzan is a large beef breed of cattle. The hair color varies from golden to dark red, and the hair color of the circles of the eyes, nose, lower limbs and perineum is lighter. The head is short, the forehead is wide, the acromion is raised, the drooping flesh is well developed, the body is long and wide, the chest is wide and deep, the ribs are round, and the waist is wide, flat and wide. The whole body is full of muscles, and the front becomes developed. Limousin cattle are precocious, lean, cold-resistant, rough-feeding and fast-growing. Under good feeding conditions, the age of 6 months can reach @ 80-300 kg. At the age of 2 months, the body weight reached $50 kg and the slaughtering rate reached more than 635.
The effect of cross improvement of Chinese yellow cattle is obvious. The body shape and appearance of the first generation of cattle are close to that of the male parent. The average weight of the first weight is more than 30kg, and the growth rate is fast.
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Research Progress of Disease Resistance breeding in Pigs
The goal of high yield usually leads to a decrease in pig resistance. At the same time, pig farm diseases, especially viral infectious diseases, are a serious threat to the health of pigs. Although vaccination played an important role in prevention and treatment, the epidemic of infectious diseases could not be completely controlled and eliminated. In the long run, using genetic methods to improve the resistance of pigs to pathogens, carrying out disease-resistant breeding has the effect of curing the root causes. In the 1930s, some scholars reported that there were differences in sensitivity to Marek's disease among different chicken breeds.
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Measurement of grass yield in grazing land Calculation of sheep load
(a) grass yield measurement grazing land grass yield is affected by factors such as season, climate, species and grazing use. It is important to determine the reasonable sheep load by measuring the grass yield of grazing land. Sample method can be used. The mowing quantity of 1 square meter pastureland is taken as a sample, at least 10 sample squares are sampled in each grazing plot, 10~20 sample squares are sampled in each large area, 50~100 sample squares are required for desert pastureland, and the actual number of sample squares is divided by the grass yield of sample squares.
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