公安部向内蒙古六十年大庆安保工作赠送警犬

【背景说明】内蒙古自治区成立于1947年,是在中国共产党领导下,新中国成立的我国第一个少数民族自治区。2007年是内蒙古自治区成立60周年,届时将举行隆重的庆祝活     

玉米副产物的饲用价值

本文主要介绍了玉米加工的副产物的种类、数量及常见几种主要玉米副产物的营养价值,并进一步阐述了其饲用畜禽的饲用价值。     

后非洲猪瘟时期洋三元（DLY）商品母猪作种用的可行性分析及建议

自从2018年非洲猪瘟在中国暴发以来,为了尽快恢复产能,我国很多猪场在生产上开始采用洋三元商品母猪留作种用。通过收集某大型猪场的二元（（LY）母猪和洋三元（DLY）商品母猪的生产记录,统计两者在生产成绩上的差异,并综合其他文献来分析洋三元商品母猪留作种用的优缺点,给出改进的措施,为后非洲猪瘟时期养猪生产提供参考。     

返滴定法测定蜂胶中游离酸含量

建立测定蜂胶品中游离酸含量的方法.采用弱碱溶解蜂胶再酸化萃取的方法纯化样品,用返滴法测定,以水杨酸作为对照品检测样品中游离酸含量.结果测定了5个不同产地的蜂胶样品,游离酸含量在1.89～6.54%范围内,回收率为99.30%.本方法操作简单,重现性好,有助于蜂胶质量的鉴别.     

Lysine restriction and realimentation affected growth,blood profiles and expression of genes related to protein and fat metabolism in weaned pigs

To investigate the effects of lysine restriction and subsequent realimentation on growth performance, blood profiles and gene expression of leptin and myostatin, 128 weaned pigs [initial body weight (BW) 6.96 ± 1.07 kg, 26 ± 2 days of age] were randomly allotted to four treatments. The starter diets during the first 2 weeks (P1) contained 100%, 80%, 70% or 60% of recommended lysine levels ( National Research Council, 1998 ). Then, common grower 1 and 2 diets were offered for 2 weeks (P2 and P3) each. During P1, average daily gain (ADG) was linearly reduced (p < 0.05) with the increasing levels of lysine restriction. Growth rate was greater in pigs previously fed lysine‐restricted diets than well‐fed pigs although it did not reach a significant level during realimentation. However, the final BW and overall ADG were the lowest (p < 0.05) and F/G was poor in pigs fed 60% lysine diet. Relative visceral organ weights and composition of skeletal muscle were similar (p > 0.05) among the treatment. Blood triglyceride and glucose levels were increased (p < 0.05) during P1, while blood urine nitrogen, total protein and albumin levels were decreased (p < 0.05) during P2 with the reduction in dietary lysine levels. The abundance of myostatin mRNA in skeletal muscle and leptin mRNA in subcutaneous adipose tissue were lower (p < 0.05) in lysine‐restricted pigs than in pigs fed non‐restricted diets. In conclusion, 80% and 70% lysine restriction of starter diets resulted in inferior growth and compensatory growth effect was noted during realimentation, while 60% lysine restriction had a negative influence on growth performance. Moreover, the changes in myostatin and leptin mRNA abundance caused by nutritional manipulations may be involved in the regulation of protein and fat deposition in young pigs.     

Impact of cold-season grazing and supplementary feeding on rumen metabolic parameters and micro-organisms in the ewes of Gansu Alpine Fine Wool Sheep北大核心CSCD

An experiment was conducted to scientifically identify the appropriate feed for Gansu Alpine Fine Wool ewes in order to change the animals' breeding mode, which currently can only be mated at the age of 2.5 years due to insufficient nutritional supply. The experiment selected 48 12-month-old ewes and randomly divided them into group a (Diet 1), group b (Diet 2), group c (Diet 3), and a control group with no supplementary feeding. The feed test was run for 90 days. The rumen pH of groups a and b were very significantly higher (P<0.01) or group c significantly lower (P<0.05) than control group. The rumen ammonia nitrogen, protein nitrogen and total nitrogen of groups a, b and c were all higher than control group (P<0.01). The total volatile fatty acids of group a and b were all higher than the control group (P<0.01), group b significantly higher than group c (P<0.05). The molar ratio of acetic acid and propionic acid in group a was very significantly higher than control group (P<0.01), group b and c were significantly higher than control group (P<0.05). The molar ratio of butyric acid in group a was very significantly higher than group c (P<0.01). The ratio of acetic acid and propionic acid in group b was significantly lower than control group (P<0.05). The number of several rumen fiber-degrading bacteria and protozoa in groups a, b and c were very significantly (P<0.01) or significantly (P<0.05) higher than the control. In conclusion, this study shows that supplementary feeding can positively affect the rumen metabolic parameters and the number of several rumen microorganisms in Gansu Alpine Fine Wool ewes. In general, the effects of Diet 1 were the strongest, while Diet 2 also produced notable improvements. © 2018, Editorial Office of Acta Prataculturae Sinica. All rights reserved.     

废渣固态发酵生产酵母蛋白质饲料及其产业化发展措施

文章综述了近几年来采用废渣固态发酵技术生产酵母蛋白质饲料的研究进展,对其应用前景和产业化发展措施进行了探讨,并提出制订固态发酵产的酵母粉的质量评估指标与质量标准,以规范该产品的生产、品管和销售市场。     

鸭疫里氏杆菌免疫原性研究Ⅰ.荚膜的形态学观察及荚膜物质的提取

本研究应用电镜对Ⅰ型鸭疫里氏杆菌的荚膜进行了初步观察,在电镜下,负染的菌体周围呈一电子透明层;未经抗体处理的细菌超薄切片,荚膜在菌体周围呈松散的絮状结构,而应用同源抗体处理后,荚膜则呈一均匀层。同时在超薄切片中还看到细菌的空泡和外膜结构。采用十六烷基三甲基溴化铵（ＣＴＡＢ）成功地提取了培养物上清液中的荚膜成分,经过测定比较,加入５ｍＭＣＴＡＢ时效果最佳。     

Expression and Hormonal Regulation of Hoxa10 in Canine Uterus During the Peri-implantation Period

Hoxa10, a homeobox gene, is necessary for endometrial receptivity to blastocyst implantation. The aim of this study was to investigate the differential expression of Hoxa10 in canine uterus during early pregnancy and its regulation under different conditions by in situ hybridization. Hoxa10 mRNA was mainly localized in glandular epithelium and myometrium in canine uterus. There was a low level of Hoxa10 expression in the glandular epithelium on days 6, 12 and 17 of pregnancy. On day 20 of pregnancy when embryo implanted, Hoxa10 mRNA was highly expressed in the glandular epithelium surrounding the embryo, but not in the luminal epithelium. The expression of Hoxa10 mRNA gradually declined from day 23 and reached a low level on day 28. In the myometrium, a low level of Hoxa10 mRNA signal was seen on days 6, 12 and 17 of pregnancy and reached a high level on day 20 of pregnancy. During the estrous cycle, a high level of Hoxa10 mRNA expression was seen in the estrous uterus. Either estrogen or progesterone significantly induced the expression of Hoxa10 mRNA in the ovariectomized canine uterus. These results suggest that Hoxa10 expression is closely related to canine embryo implantation and upregulated by estrogen and progesterone.     

Pharmacokinetics of sanguinarine,chelerythrine, and their metabolites in broiler chickens following oral and intravenous administration

Sanguinarine (SA) and chelerythrine (CHE) are the main active components of the phytogenic livestock feed additive, Sangrovit®. However, little information is available on the pharmacokinetics of Sangrovit® in poultry. The goal of this work was to study the pharmacokinetics of SA, CHE, and their metabolites, dihydrosanguinarine (DHSA) and dihydrochelerythrine (DHCHE), in 10 healthy female broiler chickens following oral (p.o.) administration of Sangrovit® and intravenous (i.v.) administration of a mixture of SA and CHE. The plasma samples were processed using two different simple protein precipitation methods because the parent drugs and metabolites are stable under different pH conditions. The absorption and metabolism of SA following p.o. administration were fast, with half‐life (t_1/2) values of 1.05 ± 0.18 hr and 0.83 ± 0.10 hr for SA and DHSA, respectively. The maximum concentration (C_max) of DHSA (2.49 ± 1.4 μg/L) was higher that of SA (1.89 ± 0.8 μg/L). The area under the concentration vs. time curve (AUC) values for SA and DHSA were 9.92 ± 5.4 and 6.08 ± 3.49 ng/ml hr, respectively. Following i.v. administration, the clearance (CL) of SA was 6.79 ± 0.63 (L·h^?1·kg^?1) with a t_1/2 of 0.34 ± 0.13 hr. The AUC values for DHSA and DHCHE were 7.48 ± 1.05 and 0.52 ± 0.09 (ng/ml hr), respectively. These data suggested that Sangrovit® had low absorption and bioavailability in broiler chickens. The work reported here provides useful information on the pharmacokinetic behavior of Sangrovit® after p.o. and i.v. administration in broiler chickens, which is important for the evaluation of its use in poultry.