西北寒旱地区湖羊及其杂交后代生长发育模型分析

本试验测定了舍饲条件下的215只湖羊和60只湖杜湖[湖羊♂×(杜泊羊♂×湖羊♀)♀]杂交羔羊0~12月龄的体重,采用Gompertz模型和Logistic模型拟合了湖羊和湖杜湖杂交羔羊0~12月龄生长过程,并分析比较了生长参数及模型估计值,进而评价湖杜湖的杂交优势。结果表明,2种模型的拟合度(R²)均在0.96以上,拟合效果好,其中Gompertz模型拟合两个种群效果好于Logistic模型;湖羊公、母羔拐点月龄分别为2.55和1.73个月,拐点体重分别为17.00和13.14 kg;湖杜湖公、母羔拐点月龄均早于湖羊,公、母羔拐点体重分别相差0.74和2.66 kg,公、母羔累积生长均极显著高于湖羊(P<0.01)。结果说明湖杜湖早期生长强于湖羊,湖杜湖杂交效果显著。     

无角牦牛与有角牦牛血液生理、生化指标的比较研究

本研究从血液生理、生化指标水平探讨有角和无角牦牛群体的体况和代谢差异,为无角牦牛新品种的选育提供理论依据。试验检测了有角、无角牦牛群体的30项血液生理与生化指标,并用独立样本t检验对两个群体测得的各项指标进行了比较分析。结果表明,两群体间有11项指标差异极显著（P<0.01）,5项指标差异显著（P<0.05）,14项指标差异不显著（P>0.05）。从测定的数据初步判定,有角与无角牦牛群体在高原低氧适应性、肝脏代谢、肾脏代谢及骨质形成方面存在一定差异,无角牦牛比有角牦牛更适应高原低氧的环境。本试验结果可为牦牛品种资源的合理保护和利用以及新品种的选育提供科学依据。     

Pyogranulomatous lesion causing neurological signs localised to the sacral region in a horse

This case report describes neurological signs associated with a pyogranulomatous lesion within the sacral vertebral canal of a horse. The clinical findings included urinary overflow incontinence and reduced anal, perianal and tail tone. The horse failed to respond to medical management and a guarded prognosis for return to athletic performance initiated the decision for euthanasia.     

西北寒旱地区舍饲湖羊生长发育特征研究

湖羊是世界上稀有的绵羊地方品种,以多胎、早熟、早期生长发育快、宜舍饲等优良性能而著名。为系统了解湖羊生长发育的基本规律,更好地开发利用湖羊这一优良地方品种资源,本研究以3,6,12和24月龄湖羊公羊为对象,每个时间点随机选择6只,共24只,测定其体重、组织器官及消化道各个部分重量、肠道长度及肉品质相关参数。结果表明,3~6月龄湖羊生长速率最快,6月龄之后逐渐降低;3~6月龄之间心、肝、脾、肺、肾、头蹄和皮的增长强度随着日龄的增大而增长,除头、蹄、皮外,其他内脏器官的生长强度逐渐降低,12月龄之后趋于稳定;头、蹄、皮的生长在6月龄之后趋于稳定,仍然保持较高的生长强度;瘤胃的生长强度始终大于体重生长强度,小肠的生长始终小于体重,而除直肠外,大肠的生长强度与体重相近。6月龄湖羊公羔与12月龄相比屠宰率、眼肌面积无显著差异,而6月龄湖羊公羔背膘厚极显著增高,随着年龄的增长肉色逐渐变暗。综合以上各项指标认为,本试验条件下,6月龄为肥羔生产最佳屠宰日龄。     

Infertility in a Dog due to Proximal Cytoplasmic Droplets in the Ejaculate: Investigation of the Significance for Sperm Functionality In Vitro

A 4-year-old Basque Shepherd male dog was presented for breeding soundness evaluation after the dog failed to impregnate the three bitches he had mated. Clinical examination showed no anomaly of the reproductive system. Semen evaluation showed normal sperm count (640 x 10(6)), 80% had progressively motile spermatozoa, and 96% had morphologically abnormal sperm of which 84% had proximal cytoplasmic droplet and 12% had proximal droplet plus other anomaly. A zona pellucida-binding assay, using canine oocytes derived from frozen-thawed ovaries, was performed in order to investigate the zona-binding ability of dog spermatozoa with proximal cytoplasmic droplets. For the zona pellucida-binding assay, ovaries were thawed and minced in phosphate-buffered saline + 0.4% bovine serum albumin, the oocytes recovered were divided into two groups of 35-40 oocytes to be, respectively, used with the infertile dog and with a control fertile dog. Spermatozoa were capacitated in Canine Capacitating Medium (CCM) at 38.5 degrees C and 5% CO(2) in air for 2 h before oocyte insemination. Groups of five to six oocytes placed in 45 microl droplets of CCM were incubated for 1 h. Afterwards, 5 microl of CCM containing 25,000 spermatozoa were added to each droplet and co-incubated for 2 h before fixation and evaluation of the complexes. After oocyte insemination, sperm motility and viability were evaluated: the sample from the infertile dog had 85% sperm motility with fast and linear progressive movement, and sperm viability of 92%. The sample from the control dog showed 40% sperm motility with fast and highly curvilinear and erratic movement, high degree of sperm agglutination and sperm viability of 32%. For the infertile dog the mean number of bound spermatozoa/oocyte was 0.33 whereas for the control dog it was 1.80. It was concluded that dog sperm with proximal cytoplasmic droplets seem to lack normal capacitating ability in vitro, and consequently, they may have reduced capacity to bind to the zona pellucida of canine oocytes.     

不同蛋白质水平补饲料对早期断奶犊牦牛生产性能和胃肠道发育的影响

本试验旨在探究不同蛋白质水平补饲料对3月龄早期断奶犊牦牛生产性能、血液指标和胃肠道发育的影响。选取3月龄(90±5)日龄]健康大通母犊牦牛48头,随机分为4组,每组4个重复,每个重复3头。对照组犊牛全放牧,试验组犊牛在放牧基础上分别补饲不同蛋白质水平(粗蛋白质水平分别17%、18%、19%)的3种等能量(增重净能5.6 MJ/kg)饲粮。预试期7 d,正试期60 d。结果表明:1)与对照组相比,补饲能够显著提高犊牦牛的平均日增重,17%、18%和19%补饲组分别提高了28.87%、47.47%和28.61%(P0.05)。2)与对照组相比,补饲显著提高了血清尿素氮浓度(P0.05),17%、18%和19%补饲组分别增加了10.57%、16.64%、21.84%(P0.05)。3)与对照组组相比,补饲料粗蛋白质水平为18%时,显著提高了瘤胃和大肠的绝对重量和相对重量(P0.05),显著提高了十二指肠、盲肠、结肠的绒毛高度以及十二指肠和盲肠的绒毛高度/隐窝深度(P0.05)。因此,补饲能够提高早期断奶母犊牦牛生产性能和促进胃肠道发育,早期断奶母犊牦牛的补饲料的适宜粗蛋白质水为18%。     

中国美利奴羊超细型羊毛理化性能研究及灰评估

测定中国美利奴羊超细型羊毛理化性能,并与主要经济性状进行相关性分析,运用灰色理论评估不同品系羊毛品质。研究结果表明,超细型羊羊毛纤维直径极显著低于其它品系（P<0.01）;弯曲数显著提高（P<0.05）;纤维直径与其它各性状间均不相关（P>0.05）;毛丛长度增加,净毛量随之增加（P<0.05）;弯曲数增加,抗压缩弹性增强（P<0.01）;净毛光泽度、白度、黄度间呈显著正相关（P<0.05）。超细型羊毛综合品质优良,在本品种内品质较高。