Structure Design of Large-scale Sow House with Fermentation Bed

ln this research, the whole contact-type large-scale sow house with fer-mentation bed was designed. The planning area of the entire piggery was 5 700 m2 with workplace and green belts. The sow house was 93 m long and 33 m wide, a total of 3 069 m2, including office area of 60 m2 and aisle area of 107 m2. The fer-mentation bed had an area of 2 902 m2 with length of 88.7 m and width of 27.7 m. lts area accounted for 95% of the total area of sow house. The fermentation mattress had a depth of 80 cm, and had a volume of 2 321 m3, equivalent to 733 t of coconut chaff and rice chaff. On a large fermentation bed, the areas for boars, replacement gilts, pregnant sows, obstetric tables, nursery pigs, etc. were designed. The large-scale sow house with fermentation bed was equipped with the automatic feeding system, automatic sprinkler system, automatic positioning column for preg-nant sows, sows＇ obstetric table system, fanning wet curtain cooling system, video monitoring system, environmental monitoring （light, temperature, water, humidity, CO2, NH3） and automatic control system. Every farming area was equipped with feeding trough and water trough. The water though was fixed with overflow pipe for removing the extra water. The house could hold 500-head sows. Each sow occu-pied 4.9 m2 of the fermentation bed in average. The designed sow house had a maximum annual output of 10 000 piglets.     

不同激素处理对猪排卵效果的影响

试验采用孕马血清促性腺激素(PMSG)、人绒毛膜促性腺激素(HCG)、前列腺烯醇(PG)3种不同的激素,处理后备母猪并进行配种、手术取卵,观测卵巢,收集胚胎并进行胚胎计数.结果表明,孕马血清促性腺激素与人绒毛膜促性腺激素的组合能显著提高母猪胚胎的数量(P＜0.05):而前列腺烯醇处理只表现出诱导发情并能正常排卵的效果,但没有提高胚胎数量的作用(P＞0.05).     

The Studies on the Grunting of Sows during Nursing and the Sucking Behaviour of Piglets

Two experiments were carried out to study the grunting of sows during nursing and the sucking be-haviour of piglets. In experimental I,six Yorkshire sows and their litters were observed and managed in farrowing crates.In experimental Ⅱ,six Harbin White sows and their litters were selected and housed in farrowing pens.The behaviours and activities of the sows during nursing and the actities of piglest during sucking were recorded with a portable video camera (PanasonicNV-VX22EN)The results showed that the characteristic patterns of grunting by the sows consist of an initial period of rhythmic grunting at a fairly constant rate and followesd by a period of more rapid grunting,and then a decline in grunting rate toward the completion of nursing.The pattern of vocalization showed by the mothers bears a reliable synchronization to the sucking behaviour of the piglets.The rate of grunting varied little during jostling for teat and nosing the udder.The beginning of slow sucking usually occurred during of just after the increase in grunt rate.The rapid sucking began 15-25seconds after the period of most rapid grunting,fol-lowingthe decrease of grunt rate.afterwards the nursing ended.There were individualities found in sows‘grunting patterns.It is found that vocalizations attracted the piglets to the sows and synchronized sucking activities of piglets,but the results indicated that the premassaging time and numbers of piglets enagaing massaging influ-enced the grunting pattern and the onset of the milk ejection.As more piglets were involved the massaging,the higher the grunting rate peak,the faster the milk ejection.     

玉米平作膜上精播抗旱节水高产栽培技术

为了提高覆膜拜玉米的生产效率,以玉米平作膜上精播抗旱节水高产栽培技术研究为依据,总结了技术模式的主要成效,阐述了高产栽培的栽培技术要点,包括技术内涵、选择机具、整地播种、病虫草防治和收获等方面.     

硒对母猪氧化应激及其后代抗氧化能力的营养调控研究

硒作为的重要微量元素之一,可以通过胎盘和乳组织进行转移.仔猪可以从乳汁中获取硒源,提高硒含量,进而提高仔猪的初生重.同时,硒也能够调节母猪妊娠期间代谢速度,控制妊娠期自由基产生,进而提高胎盘输送营养功能.文章从母猪氧化应激体系角度来解析硒对母猪妊娠期氧化应激的调控机制、硒对哺乳母猪生产性能的调控作用.