日粮纤维对猪饲料能值评定的影响

日粮纤维为结构性与非结构性多糖和木质素的总称。猪对日粮纤维的消化随日粮纤维来源和组分不同而存在差异。随体重和年龄的增加,猪对日粮纤维消化能力提高,成年母猪对日粮纤维利用率最高。对高日粮纤维饲料至少要提供2个能量值:一个对生长猪,一个对成年母猪。日粮纤维对猪能量供应的实际效果受到环境温度或动物行为变化的影响。     

Immunoprotective Efficacy of a Purified 39 kDa Nymphal Antigen of Hyalomma anatolicum anatolicum

Soluble nymphal antigens (HNAg) were purified by immunoaffinity chromatography using CNBr-activated Sepharose 4B coupled with immunoglobulin ligands from animals immunized with HNAg and 69–71% protected against challenge infestations, and 8% recovery of the purified protein (Aff-HNAg) was obtained. Following immunization of crossbred calves (Bos indicus×Bos taurus) with 1600 g of Aff-HNAg in three divided doses, significant rejections of larvae (p<0.001, 84.2%), nymphs (p<0.05, 61.4%) and adults (p<0.05, 58.7%) were recorded. No significant changes were recorded in the engorgement weights of the larvae and nymphs, but there was a significant (p<0.05) reduction in the weight of the engorged adults. Immunization conferred a significant decrease in the numbers of resultant nymphs (p<0.001) and adults (p<0.001) that had fed on the immunized animals. SDS-PAGE analysis identified a 39 kDa protein, previously isolated from larvae of Hyalomma anatolicum anatolicum, as the antigen responsible for the induction of resistance against all the stages of the tick.     

无角陶赛特改良蒙古羊的效果分析

采用随机抽样的方法,对甘肃省永昌县引进的肉羊品种无角陶赛特杂交改良蒙古羊的杂种F1（DMF1）、F2（DMF2）F3（DMF3）在不同年龄阶段通过测定体重体尺指标,以当地蒙古羊（M）为对照进杂交效果的分析。结果表明杂种后代的主要生产性能均优于蒙古羊,无角陶赛特杂交改良蒙古羊杂交效果显著,在条件允许的情况下可以对当地蒙古羊进行大规模杂交,尤其是高代杂交经济效应更为显著。     

Effects of different gestation housing types on reproductive performance of sows

This study evaluated the effects of different gestation housing types on reproductive performance of sows. A total of 60 sows (218 ± 24 kg body weight) with mixed parity were used. During gestation, 28 sows were housed in groups with electronic sow feeders (space allowance = 1.26 m²/sow) and 32 sows were housed in individual stalls (space allowance = 1.20 m²/sow). Sows from both housing types were moved to farrowing crates on day 109 of gestation and stayed until weaning (18 days post‐farrowing). Typical corn‐soybean meal diets were provided to sows during gestation and lactation. Measurements were reproductive performance of sows at farrowing as well as performance of sows and their litter during lactation. Similar total numbers of piglets born at farrowing were observed for sows gestated in both housing types. However, group‐housed gestation sows had more mummies (0.321 vs. 0.064; P < 0.05) and stillbirths (0.893 vs. 0.469; P = 0.073) at farrowing than individual‐housed gestation sows. Consequently, individual‐housing type had higher percentage of piglets born alive (95.5 vs. 90.4%; P < 0.05) than the group‐housing type. Therefore, improved reproductive performance of sows from individual gestating housing was confirmed in this study.     

Quantitative assessment of the effects of outside temperature on farrowing rate in gilts and sows by using a multivariate logistic regression model

It is well known that pigs are sensitive to heat stress, but few studies have assessed the critical temperature that affects farrowing rate. Therefore, the objective of the present study was to assess the effects of outside temperature on farrowing rate by using a multivariate logistic regression model. Data were obtained from 25 commercial farms, including 26,128 service records for gilts and 120,655 service records for sows. Two variables, maximum temperature (MAX) and temperature humidity index (THI), were used as an indicator for climate conditions. In gilts, an interaction between climate conditions and service number was associated with farrowing rate (p < .05). In the first service, farrowing rate decreased as climate conditions increased, whereas no relationship was found in the second service or later. In sows, farrowing rate at first service decreased as MAX increased from 22°C or THI increased from 66 (p < .05), but no apparent reduction under heat conditions was found in the second service or later. Additionally, effect of heat stress on farrowing rate in parities 1–2 was higher than those in parities 3–5 and ≥6 (p < .05). These results can be applied to field conditions as a standard for the critical temperature for farrowing rate.     

The Purchasers'' Risks and Its Precautions in the Pre-Selling of Commercial Houses

With the development of innovation in economic system,the real estate business became more and more active in recent years.In order to fit the innovation in housing system,the commercial housing pre-selling emerged,as the times require.Because the commercial housing pre-selling is still in the first phase in China,and the legal relations of the business are comparatively complicated,the legislation is not perfect correspondingly.So there are some new problems in the pre-selling of commercial houses.Hence the purchasers' risks and the precautions in the pre-selling of commercial houses are discussed in this paper.     

玉米三交种郑三3号高产原因分析

用郑三3号的3个亲本自交系,组配成6个正反单交组合和6个以单交为母本的三交组合,进行产量比较和性状调查。结果表明,6个单交组合之间的产量差异不显著,6个三交组合之间的产量差异亦不显著,说明这3个自交系相互间的配合力都很高,这是郑三3号的产量达到了优良单交种产量水平的内在因素。     

商业银行内部控制存在的问题及对策

本文就当前经济体制由计划经济向市场经济转轨的过程中,对商业银行内部控制的问题提出相应对策观点.