Three external factors affecting the fattening of mutton sheep!
The normal growth and development of mutton sheep has certain requirements for humidity. Generally, the relative humidity of the sheep house is 50%-60%, and the maximum is no more than 75%. If the humidity is too high or too low, it will affect the growth and development of mutton sheep. Under suitable temperature conditions, humidity generally does not affect weight gain, but under high or low temperature conditions, the impact of humidity on weight gain is more obvious.
1. Under high temperature and high humidity conditions, the daily gain and feed utilization rate of mutton sheep will decrease significantly. The environment at this time is quite favorable to the reproduction of bacteria, and it is easy to cause ectoparasitic diseases and respiratory diseases.
2. Under low temperature and high humidity conditions, mutton sheep are prone to rheumatism, arthritis and digestive tract diseases.
3. The air is too dry, coupled with high temperature, the skin and exposed mucous membranes of the sheep will be dry and cracked, which will weaken the resistance of the skin and exposed mucous membranes to pathogenic microorganisms; therefore, the temperature of the sheep house is 14-22 degrees, and the relative humidity is 55%-60%. Optimal humidity for growth and development.
Appropriate light can promote the growth and development of mutton sheep to a certain extent. Light can excite the nervous system of sheep, improve the metabolic level, strengthen the metabolism of calcium and phosphorus, promote bone growth, and promote the growth of gonads through the nervous system.
According to the test: under the three temperature conditions of 5 degrees, 18 degrees and 31 degrees, lambs are divided into long light (16 hours per day) and short light (8 hours per day). The weights were 320 grams, 275 grams, and 213 grams, respectively, while the corresponding daily gain of the short-light group was 287 grams, 245 grams, and 152 grams. The long-term light was better than the short-light under the same temperature conditions.
3. Environmental quality
The environmental quality of the sheep house usually refers to the harmful gas, dust content and stocking density in the sheep house. The toxic gas in the sheep house mainly refers to ammonia, hydrogen sulfide, carbon dioxide and so on. Excessive concentration of toxic and harmful gases in the house can directly threaten the health of sheep and affect growth and development. In severe cases, it can cause bronchial diseases and influenza in sheep.
1. The impact of toxic and harmful gases on mutton sheep
1) Ammonia gas The ammonia gas in the sheep house is decomposed from waste such as manure, feed and bedding. When the amount of ammonia gas in the sheep house reaches 0.005%, it will have a harmful effect on the sheep. When the ammonia gas reaches 0.01%-0.015%, the daily gain and feed utilization rate of the sheep will decrease; the long-term effect of low-concentration ammonia gas can cause sheep Reduced resistance, increased morbidity and mortality. Under normal circumstances, the ammonia content in the sheep house does not exceed 0.0026%.
2) Hydrogen sulfide Hydrogen
sulfide is also formed by the decomposition of sulfur-containing organic matter such as manure, feed and bedding in sheep houses. It poses a great threat to sheep. High concentrations of hydrogen sulfide gas can cause ophthalmia, cough, pulmonary edema, etc. in sheep. Make the sheep's physique weaker and their resistance lowered. Under normal circumstances, it is required that the hydrogen sulfide content in the sheep house should not exceed 0.001%.
3) Carbon dioxide
The carbon dioxide in the sheep house is the exhaust gas produced by the sheep's breathing. Carbon dioxide itself is non-toxic, but the long-term effect of high-concentration carbon dioxide can cause hypoxia in the sheep house, causing the sheep to lose their spirits, lose their appetite, and reduce their weight gain. Generally, the concentration of carbon dioxide in the sheep house is required not to exceed 0.15%, and good ventilation should be maintained in the sheep house.
2. The impact of dust in the sheep house on mutton sheep The dust in the sheep
house is mostly composed of feed, manure, animal fur, insects and microorganisms, such as fungi. Such as fungi. Endogenous toxins, harmful gases and other harmful pathogenic bacteria are not easy to be observed by the eyes, and they all have certain activities. In addition, the odor of the sheep house will adhere to the dust, spread to far away places, and exist for a long time. After inhalation, it will adhere to the lung tissue, causing respiratory diseases. Dust etc. are mixed and bonded to the skin, causing dermatitis, dryness, and cracking.
Therefore, it is necessary to do a good job of dust-proof work in the sheep house. The specific dust-proof measures are as follows: the ventilation holes on the top of the sheep house should be opened frequently, and the movement should be light when distributing dry feed in the house, and the ground of the sheep house should not be dry-swept. Keep the pens clean, clean up the feces at least 2-3 times a day, disinfect once a week, and do a good job of cleaning around the pens and killing mosquitoes and flies.
3. Stocking density
Stocking density refers to the number of sheep raised per unit area or the area occupied by each sheep. If the stocking density is too high, it is not conducive to the heat dissipation of the sheep body in summer; although it can increase the temperature of the sheep house in winter, due to the high density, the sheep will suffer from uneven feed intake and shortened rest time due to competition for food heads, which in turn will affect growth and development; and, There are a lot of steam emitted and toxic and harmful gases produced. If the ventilation is not timely, the air in the sheep house will be dirty, which is not conducive to the health of the sheep. The density is small, and the sheep shed and other facilities cannot be used for breeding points, resulting in waste. Therefore, the stocking density should be reasonably controlled.
Generally speaking, the sheep house area required for each sheep is 1.4-1.6 square meters for lambing ewes, 1.8-2.4 square meters for group-raising rams, 0.7-0.9 square meters for adult goats and bred rams, and 1-year-old breeding rams. Ewes 0.8-1.0 square meters, castrated lambs 0.6-0.8 square meters, the lambing room can be calculated according to 20%-25% of the basic number of ewes, the playground area is generally 2-2.5 times the sheep house area, adult sheep The area of the playground can be calculated as 4 square meters.