生猪价格超常波动对健康养殖推广的影响

生猪价格的超常波动使生猪养殖风险增大、收益不稳定,频繁的价格波动影响了养殖主体决策的理性,同时,养殖主体决策的非理性也会对生猪健康养殖推广造成明显的障碍。因此,只有确保中央政策与地方政策的配套协同,构建生猪产业链内各主体之间合理的利益关系,对养殖主体的心理预期进行调节,针对养殖主体的需求改变推广模式与方法,才能有效突破生猪价格波动对生猪健康养殖推广的制约。     

基于近红外预测羊草水分含量的特征光谱模型研究

水分是牧草最为重要的品质属性,水分含量的多少直接影响牧草品质的变化。羊草（Leymus chinensis）因富含重要的维生素、蛋白质、中性洗涤纤维、酸性洗涤纤维、脂肪等家畜必需营养成分,在收获和储藏过程中极易受到生长地的水、土、气等的影响而发生营养成分损失或变质,因此为了有效降低冗余无信息变量,提高羊草水分含量近红外模型的预测精度和稳定性,本研究采用4种光谱特征区间选择方法,包括间隔偏二乘法（Interval partial least-squares regression,iPLS）、向后区间偏最小二乘法（Backward interval PLS,BiPLS）、联合区间偏最小二乘法（Synergy interval PLS,SiPLS）、和连续投影算（Successive projections algorithm,SPA）建立羊草水分含量的预测模型。结果表明：SiPLS方法最适合用于羊草水分含量特征波长的筛选,其次为BiPLS方法,最差的方法为iPLS,同时,相对分析误差（Residual predictive deviation,RPD）=2.648>2.50。这表明SiPLS的近红外光谱模型在预测羊草水分含量的应用上完全可行,预测精度在96.13%以上。     

ANGIOGRAPHIC EVALUATION OF BOVINE FOOT ABNORMALITIES

Angiography of normal and diseased feet in cattle was carried out. In osteomyelitis of distal phalanx there was a narrowing of the digital artery with diminished vascular supply to the affected digit. An area of bone necrosis was found to be avascular. With overgrown hooves, narrowing of both the medial and lateral digital arteries with ill-defined laminar vessels was seen. The vascular pattern in cattle with cork screw claws was characterized by a dilated tortuous digital artery and a crowded arterial network resulting in increased vascular supply in the affected claw. Abrupt stricture of common digital artery, a crowded vascular network in the area of the middle phalanx and filling defects of terminal arches were demonstrated in animals with exostosis     

指纹图谱技术在紫花苜蓿品种鉴定中的发展与应用

品种鉴定是确定品种真实性的一种重要质量检验手段,通过分析比较指纹图谱技术在紫花苜蓿品种鉴定过程中的优势与不足,指出在我国现阶段紫花苜蓿Medicago sativa的品种鉴定应在现有常规技术基础上不断提高完善,并深入开展新技术、新方法的研制,才能为我国紫花苜蓿草产业的健康持续发展提供质量保证.     

对退耕还林工程中种草的探讨

分析种草在退耕还林工程中的重要地位和作用 ,提出退耕种草的草种选择和种植模式 ,并探讨发展草产业的途径和方向     

Association of a missense mutation in the luteinizing hormone/choriogonadotropin receptor gene （LHCGR） with superovulation traits in Chinese Holstein heifers

Background: Upon binding luteinizing hormone in the ovary, the luteinizing hormone/choriogonadotropin receptor (LHCGR) is necessary for follicular maturation and ovulation, as well as luteal function. We detected mutations in the LHCGR gene and evaluated their association with superovulation. Methods: Using polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and DNA sequencing, we examined polymorphisms in LHCGR and the genotypes associated with superovulation traits in 127 Chinese Holstein heifers. Results: A G/T polymorphism (ss52050737) in exon 11 was significantly associated with the total number of ova and the number of transferable embryos. Conclusions: LHCGR may be a new predictor for superovulation in Chinese Holstein heifers.