重新认识农区山羊放牧饲养

文章从山羊养殖历史、生物学特性、自然社会、经济效益、生态环保、市场消费及国外养殖进展等方面进行研究,认为我国南方农区山羊饲养应回归放牧养羊,可以实现社会生态经济的可持续发展。同时提出放牧养殖的标准化建设思路。     

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 论文对柴达木地区山羊养殖品种、基本情况、存在问题和发展思路做一综述,仅供同行参考与借鉴。     

放牧条件下绒山羊绒毛季节性生长变化规律的研究

本试验研究放牧条件下绒山羊绒毛季节性生长变化的规律。选择体重及产绒性能相近的2.5岁内蒙古白绒山羊羯羊10只,随机均分为2组,分别接受自然光照和短光照处理,短光照组每天的光照时间比自然光照组减少2小时,两组试羊在同一草场放牧。结果表明,放牧条件下,随牧草营养值下降(CP含量13.9%～6.0%)和光照递减(14.6～9.4h/d),绒毛生长呈慢—快—慢增长模式,主要的生长期在9月下旬～12月上旬,11月份为高峰期;减少光照可刺激绒毛生长,使快速生长的时间提前至8月下旬,绒毛长度增加10.9%,但生长模式不变。绒毛细度(14.6～14.9μm)和强度(6.9～5.9g)不受季节影响,但绒毛伸度下降54.3%;减少光照不改变绒毛强度和伸度,但绒毛细度增加5.6%、产绒量提高12.5%。     

高原山羊血气分析

有血气分析仪对２１只高原山羊进行血气分析，结果：ｐＨ７．３５±０．０５，ＰＣＯ２４．７４±０．４２ｋＰａ，ＰＯ２３．７９±１．０５ｋＰａ，ＨＣＯ－３２０．０８±３．０３ｍｍｏｌ／Ｌ，ＴＣＯ２２１．９±３．０７ｍｍｏｌ／Ｌ，ＢＥ－４．９８±２．３１ｍｍｏｌ／Ｌ，ＳＢＣ　２０．２５±２．６５ｍｍｏｌ／Ｌ，ＳＢＥ－６．１９±２．８６ｍｍｏｌ／Ｌ，Ｏ２Ｓ％４９．４７±１４．８。表明血气值在不同性别、不同年龄间无显著差异（Ｐ＞０．０５）。     

复合人工湿地对新农村生活污水的净化效果

[目的]研究复合人工湿地对新农村生活污水的净化效果。[方法]通过建设复合垂直流-水平潜流人工湿地系统,研究其对接收新农村生活污水及雨污的池塘废水的净化效果。[结果]在春、夏、秋三季,复合人工湿地系统对废水均有较好的去除效果,且去除效果稳定。在整个运行期内,复合人工湿地系统对CODCr、TP、TN、NH4+-N的平均去除率分别达到64.71%、64.81%、40.21%、54.26%以上,且出水平均浓度均达到《地表水环境质量标准》(GB3838-2002)III类水质标准。复合人工湿地系统的二级湿地单元出水水质明显优于一级湿地单元,但第一级的处理效果高于第二级。[结论]该研究可为新农村生活污水治理提供参考依据。     

Dietary copper supplementation modulates performance and lipid metabolism in meat goat kids

Forty-eight male Lezhi black goat kids with similar body weight ((12.09±1.70) kg) and age ((60±5) d) were used to determine the effect of dietary copper (Cu), in the form of reagent grade Cu sulfate (CuSO₄∙5H₂O), on performance, serum lipid profile, and the relative mRNA abundance of genes involved in lipid metabolism.  Goat kids were stratified by body weight and randomly assigned to one of 4 treatment groups.  Each treatment consisted of 12 replicate pens with each pen containing one goat kid.  Treatment groups received the basal diet with no supplemental Cu (control), basal diet plus 10 mg of Cu kg^–1 of dry matter (DM), basal diet plus 20 mg of Cu kg^–1 of DM, or basal diet plus 30 mg of Cu kg^–1 of DM.  Goats were housed individually in pens and fed a high-concentrate pelleted diet for 60 d.  Average daily gain, average daily feed intake and feed:gain of goats were not affected by dietary Cu supplementation (P>0.10).  No differences were detected in serum total cholesterol, triglyceride, and high density lipoprotein cholesterol concentrations of goat kids fed with different Cu concentrations (P>0.05).  However, serum low density lipoprotein cholesterol concentrations decreased linearly (P=0.01) as the concentration of dietary Cu increased.  Intramuscular fat content of longissimus muscle increased (P=0.002) quadratically and liver Cu concentrations increased (P<0.001) linearly as dietary Cu concentration increased.  Compared with the control, dietary supplementation of 20 mg Cu kg^–1 DM decreased the relative mRNA abundance of fatty acid-binding protein 4 (P=0.01) and lipoprotein lipase (P=0.05), and tended to decrease the relative mRNA abundance of carnitine palmitoyltransferase I (P=0.06) in longissimus muscle of goats.  The relative mRNA abundance of peroxisome proliferator-activated receptor alpha (P<0.001), carnitine acetyltransferase (P=0.001), and carnitine palmitoyltransferase I (P=0.001) were also decreased in liver by Cu supplementation.  These results indicate that dietary supplementation of Cu modified lipid metabolism by increasing muscular fat and decreasing serum low density lipoprotein cholesterol, and the modification might be associated with the reduction of relative mRNA abundance of genes for oxidation of long-chain fatty acid in muscle and liver of Lezhi black goat kids.     

江西地方鸡品种资源的屠宰性能测定研究

对江西省9个地方鸡品种资源的屠宰性能进行了测定。结果表明:江西地方鸡品种资源具有良好的肉用性能,具有广阔的开发利用前景。