共查询到17条相似文献，搜索用时 156 毫秒
1.
试验选用23日龄断奶、体重接近的杜长大三元杂交猪90头,以常规水泥地面饲养方式为对照,研究了发酵床饲养方式对猪舍环境的影响。结果表明,发酵床饲养方式猪舍温度显著高于常规水泥地面饲养方式(P<0.05),猪舍空气中PM10浓度显著低于常规水泥地饲养方式(P<0.05),氨气和H 2S浓度极显著低于常规水泥地饲养方式(P<0.01)。说明发酵床饲养方式能改善猪舍内环境。 相似文献
2.
本试验通过对秋季条件下,测定简易发酵床猪舍和传统水泥地面猪舍的环境指标,以研究秋季发酵床养猪模式对猪舍环境的影响。结果显示,传统水泥地面猪舍相比,简易发酵床猪舍内的温度、湿度、光照强度均差异不显著,但气流速度显著增加,氨气显著降低了51.54%(P<0.05),细菌数减少了23.50%(P>0.05),舍内无臭味,少苍蝇,表明简易发酵床猪舍内的环境得到改善。 相似文献
3.
分别测定夏季和冬季发酵床养猪猪舍和常规养殖猪舍温度,结果表明,冬季发酵床养猪猪舍温度显著高于常规水泥地面养殖猪舍(P<0.01);夏季发酵床养猪猪舍温度略高于常规水泥地面养殖猪舍,差异不显著(P>0.05)。 相似文献
4.
在长江中下游地区冬季低温时期对新型发酵床猪舍与普通猪舍室内平均温度变化规律进行了对比分析。结果表明：冬季新型发酵床育肥舍室内平均温度波动幅度较大，而普通育肥舍室内日平均温度波动幅度较小；在冬季中午室外温度较高时新型发酵床育肥舍室内日平均温度基本能达到普通育肥舍室内日平均温度（P〉0．05），而在早上和晚上室外温度较低时猪舍室内的日平均温度明显低于普通育肥舍内日平均温度（P〈0．05）。试验表明，冬季新型发酵床育肥猪舍室内日平均温度具有显著变化差异。 相似文献
5.
本文旨在探讨南方夏季高温高湿环境下发酵床猪舍采用水帘降温系统的可行性。试验在发酵床猪舍和传统猪舍同时进行,夏季高温高湿环境下,启用水帘降温系统,试验期63d,监测两栋猪舍内3个区域（A区靠近水帘端、B区猪舍中央、C区靠近风机端）的温湿度分布特点、舍内空气微生物数量和氨气浓度。结果表明,采取水帘降温系统后,发酵床舍温度降低1．79℃～4．23℃,两栋猪舍3个区域温度分布特点相同,即靠近水帘端最低,发酵床猪舍中央比水帘端高0．58℃～1．04℃,风机端比水帘端高1．51℃。2．49℃。发酵床舍内细菌总数和大肠杆菌数均显著高于传统舍（P〈0．05）。发酵床舍与传统舍的舍内氨气浓度分别为（6．56±0．32）mg／m3,（8．55±0．82）mg／m3,差异显著（P〈0．05）。南方夏季发酵床猪舍采取水帘降温后,可以有效降低舍内温度和氨气浓度,但细菌总数和大肠杆菌数均显著高于传统舍,尤其是靠近风机端。 相似文献
6.
在夏季7~8月份高温季节对南京市六合区江苏省农科院试验猪场两种不同类型育肥猪舍室内温度进行了观测分析。数据比较分析表明：夏季新型可移动发酵床育肥舍室内日平均温度波动幅度较大,而普通育肥舍室内日平均温度波动幅度较小;新型可移动发酵床育肥舍在夏季中午高温时舍内日平均温度高于普通育肥舍内日平均温度,而早上和晚上的日平均温度低于普通育肥舍内日平均温度。 相似文献
7.
通过测定冬、夏季两批育肥猪的生理生化指标及育肥性能，探讨在新型大棚舍、有窗舍和开放舍3种不同类型猪舍条件下，冬季和夏季育肥猪生理生化指标状况及对育肥猪性能的影响。结果表明，冬季大棚舍猪的血红蛋白极显著高于开放舍，红白细胞总数、总蛋白、清蛋白和球蛋白显著高于开放舍，血红蛋白和总蛋白显著高于有窗舍。猪的平均日增重显著高于开放舍和有窗舍，饲料消耗低于两类猪舍，胴体瘦肉率高于两类猪舍。夏季大棚舍猪的总蛋白、清蛋白、球蛋白、血糖和胆固醇显著高于有窗舍。猪的平均日增重显著的高于其他两类猪舍、饲料消耗也低于其他两类猪舍。 相似文献
8.
为监测高架发酵床模式下封闭育肥猪舍的热环境和空气环境特征,试验测定了育肥猪舍的进风口、猪舍层、发酵床层和风机口的温度、湿度、PM_(2.5)、PM_(10)、氨气(NH_3)和硫化氢(H_2S)浓度,为规模化养殖场的高架发酵床模式畜舍的环境调控提供参考。结果发现,各采样点间的温度、湿度、PM_(2.5)、PM_(10)均无显著差异(P0.05);进风口、猪舍层、发酵床层和风机口的NH_3、H_2S平均浓度分别为8.64±0.25 mg/m~3、8.99±0.57 mg/m~3、10.92±1.77 mg/m~3、9.05±0.81 mg/m~3和17.13±5.90μg/m~3、21.04±2.16μg/m~3、22.18±1.69μg/m~3、22.25±3.35μg/m~3;发酵床层的NH_3和H_2S浓度均略高于猪舍层,但无显著差异。该试验各采样点的NH_3与H_2S平均浓度均符合GBT17824.3-2008《规模猪场环境参数及环境管理》,且高架发酵床模式下发酵床层并未影响猪舍层的空气环境质量。 相似文献
9.
本文分析了许昌市某猪场封闭式哺乳母猪舍的热工性能,分别测定了在热风炉和普通燃煤炉供暖方式下的温度和相对湿度(RH)。结果表明:封闭式猪舍的热工性能基本能够满足冬季哺乳母猪舍设计要求,两种供暖方式下舍内的温度和RH差异均不显著(P>0.05),但设在舍外的热风炉燃煤量极显著高于设在舍内的普通燃煤炉(P<0.01)。 相似文献
10.
本研究旨在探明发酵床饲养模式对断奶仔猪生产性能、腹泻、肠道菌群和畜舍环境等方面的影响,为发酵床的进一步推广应用提供科学理论依据。选择84头体重在(7.5±0.2)kg的"杜长大"三元杂交断奶仔猪,并随机分为2组。试验组采用发酵床饲养,对照组采用传统水泥地面饲养,基础日粮完全相同。结果表明,与对照组相比,试验组日增重显著增加(P<0.05),饲料增重比和腹泻率显著降低(P<0.05);试验组盲肠和结肠内容物中大肠杆菌、沙门氏菌数量明显降低(P<0.05),而乳酸杆菌和双歧杆菌数量显著升高(P<0.05);发酵床饲养模式中猪舍的环境得到显著改善,舍内温度明显升高(P<0.05),氨气浓度和悬浮颗粒浓度均显著低于(P<0.05)传统水泥地面猪舍,无论对照组还是试验组,在猪只的新鲜粪便、发酵床垫料及水泥地面中均未检测到寄生虫的存在,本研究说明发酵床养殖可提高断奶仔猪日增重和降低饲料增重比和腹泻率,具有改善肠道微生态平衡和畜舍环境的作用。 相似文献
11.
Five successive batches of fattening pigs were raised, each during a four month period, on a totally concrete slatted floor in one experimental room and on straw based deep litter in another. The rooms were automatically ventilated to maintain a constant ambient temperature. Available floor space was of 0.75 m 2 per pig kept on the slatted floor and 1.20 m 2 per pig kept on the deep litter. With this last system, about 46 kg of straw were supplied per pig throughout a fattening period. The slurry pit was emptied and the litter removed after each batch. Once a month, the emissions of ammonia (NH 3), nitrous oxide (N 2O), methane (CH 4), carbon dioxide (CO 2), and water vapour (H 2O) were measured continuously for 6 consecutive days by infra-red photoacoustic detection.The performance of the animals was not significantly different according to the floor type.Gaseous emissions from pigs raised on the slatted floor and on the deep litter were, respectively, 6.2 and 13.1 g per pig per day for NH 3, 0.54 and 1.11 g per pig per day for N 2O, 16.3 and 16.0 g per pig per day for CH 4, 1.74 and 1.97 kg per pig per day for CO 2 and 2.48 and 3.70 kg per pig per day for H 2O. Except for the CH 4 emissions, all the differences were significant ( P < 0.001). Thus, pig fattening on deep litter releases nearly 20% more greenhouse gases than on slatted floor, with 2.64 and 2.24 kg of CO 2-equivalents, respectively ( P < 0.001). Whatever the floor type, emissions increased from the beginning to the end of the fattening periods by about 5 times for NH 3, 4 times for N 2O, 3 times for CH 4 and 2 times for CO 2 and H 2O. Correlation coefficients between CO 2-emissions and H 2O, NH 3 and CH 4 emissions were, on average for both floor types, 0.82, 0.77 and 0.74, respectively.Although rearing pigs on straw generally has a good brand image for the consumer, this rearing system produces more pollutant gases than keeping pigs on slatted floors. 相似文献
12.
Extract U nits have been designed to house calves for veal production, but only recently has a large intensive unit been designed to rear surplus dairy-bred calves for beef production in New Zealand. This was built by the Rangitaiki Plains Dairy Company, Edgecumbe, early in 1973 and consisted of two types of housing: a fully enclosed and insulated calf house with 500 individual cubicles in which to rear the animals till weaning at 5 weeks of age, and a “loafing barn” with slatted walls and sawdust floor to house calves for a further 5 weeks before sale as beef weaners. 相似文献
13.
【目的】研究两种通风模式下杭州地区规模化猪场舍内环境参数及其分布规律,筛选出适合本地区推广的通风模式。【方法】选取杭州地区具有代表性的横向通风和纵向通风两种通风模式下育肥舍为研究对象,开展了早、中、晚3个不同时间点,进风口、舍中央和排风口3个不同位置的热环境参数、有害气体浓度的监测,持续监测1周。分析不同时间点和舍内不同位置对热环境参数(温度、相对湿度、风速)以及有害气体(氨气(NH 3)和硫化氢(H 2S))浓度的影响,并对两种模式下的热环境参数及有害气体浓度进行比较分析;采用空气沉淀法收集舍内环境中的细菌,并对细菌进行培养及统计分析,比较两种模式下育肥舍中细菌数量差异。【结果】两种通风模式下育肥舍相对湿度均低于国家标准,位置和各时间点对相对湿度影响不大,其中纵向通风舍内的相对湿度显著高于横向通风模式(P<0.05)。两种通风模式舍内平均温度没有显著性差异(P>0.05),舍内中午温度显著高于早、晚(P<0.05),位置对纵向通风舍内温度影响较大。纵向通风舍内平均风速为(1.09±0.42)m/s,符合国家标准且极显著高于横向... 相似文献
14.
通过测定冬、夏季肥育猪的１２ 项生理生化指标,探讨在大棚舍,有窗舍和开放舍三种不同类型猪舍条件下,寒冷和炎热季节猪的生理及健康状况。结果表明,冬季,大棚舍猪的血红蛋白极显著高于开放舍,红细胞总数、白细胞总数、血细胞压积、总蛋白、清蛋白和球蛋白显著高于开放舍,血红蛋白和总蛋白显著高于有窗舍。夏季,大棚舍猪的呼吸频率极显著低于有窗舍,显著低于开放舍,总蛋白、清蛋白、球蛋白、血糖和胆固醇显著高于有窗舍。 相似文献
15.
为了研究新型羊舍夏季小气候环境以及设计合理的饲养密度，在夏季检测了新型羊舍和西南地区常见的双坡顶漏缝地板有窗封闭式羊舍的空气环境参数，同时测定了不同饲养密度羊舍对羊体增重的影响。结果表明：①新型羊舍日平均温度和日最高温度极显著低于有窗封闭羊舍（P＜0.01）；有窗封闭羊舍与新型羊舍相比，相对湿度显著较高（P＜0.05），同时羊舍内湿度极显著高于外界湿度（P＜0.01）；②通过称重比较，试验期间低密度组羊只的体增重极显著高于中密度组和高密度组，当饲养密度增加一倍时，羊只的体增重极显著降低（P＜0.01）。综合分析认为，新型羊舍夏季小气候环境明显优于有窗封闭羊舍；在合适的饲养密度下，羊舍羊群增重效果好，羊群发病率低。 相似文献
16.
[目的]为了探讨张家口坝下地区寒冷季节育肥牛舍内外光照和风速的变化规律,以期发现该地区寒冷季节这两项指标的变化规律。[方法]在张家口怀安县某肉牛场进行了入冬后不同月份牛舍内外光照和风速的研究,在试验前对开放式肉牛育肥舍的后窗进行了封堵,测试时间为2018年11月至2019年5月,每个月的11日、12日和13日进行测定并记录数据。[结果]结果表明,坝下地区中午时间段光照强度大,育肥牛舍内外与密闭舍对比均有不同程度差异显著性(P<0.05或P<0.01);育肥舍及舍外风速也存在不同程度的差异显著性(P<0.05)变化或差异极显著变化(P<0.01)。[结论]该结果为在张家口坝下地区冬季养好育肥牛,科学合理地修缮及改造牛舍提供理论依据和技术参数。 相似文献
17.
Details are given of the environmental temperature and humidity conditions which occurred in 15 commercial houses containing broilers weighing between 1.4 and 1.8 kg. The relative humidity of these houses was related to climatic relative humidity. House relative humidity levels which were reduced by increased standards of thermal insulation, by background heating and by correct floor construction, did not fluctuate as widely when temperature and ventilation were controlled by thermostatically operated extraction fans as when the fans were manually controlled. The condition of the litter was correlated with house relative humidity; mean weekly relative humidity levels higher than 72 per cent saturated were associated with caking of the litter surface. During winter, house temperatures higher than 15° C. were achieved when the outside temperature fell to 0°C. or below only where the ventilation was automatically controlled and where the insulation contained an infill of at least 2.5 cm. thickness of mineral wool. In more poorly insulated buildings, similar temperatures were rarely achieved, even when background heating was provided throughout rearing. Studies of temperature gradients at floor level in broiler houses showed that these were partly due to large and non‐baffled air inlets whose air throughputs were affected by variations in wind speed and direction. Data of house temperatures in relation to windspeed suggest that air velocities through baffled inlets should be at least 150 m./min. at the point of greatest restriction to air flow. However, if air inlet velocities of this magnitude are used, careful design is necessary in order to prevent draughts at bird level. Observations are also presented on the incidence, causes and effects of structural condensation in broiler houses. 相似文献
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