犬的繁殖

犬是单次发情的,小型品种犬到达性成熟要比大型品种早些,公犬的性成熟比母犬延迟几周,野犬只在冬季交配,而家犬四季都能繁殖,但发情的频率趋向于春末和冬初。     

肉犬不育症的治疗

1　母犬不孕症1 5岁以上或以往能正常发情交配的母犬 ,在较长时间内 ( 10～ 2 4个月 )不见发情 ,或发情不正常且屡配不孕的 ,均可认为是不孕症。( 1)原因及表现 :先天性的 (如两性畸形、生殖器官发育不全等 ) ;饲养管理不当 (如饲料单一、缺乏某种必需氨基酸、无机盐、维生素等 ) ;母犬过肥过瘦、年老衰弱 ;感染某些疾病 (如布氏杆菌病、结核病、卵巢囊肿、子宫内膜炎 )等。主要表现不发情或发情却屡配不孕 ,甚至无法交配。( 2 )治疗方法 :可试用孕马血清 (精制品每支含4 0 0Ｕ、10 0 0Ｕ、30 0 0Ｕ) ,犬为 2 5～ 2 0 0Ｕ /次 ,皮下或肌肉注…     

影响种犬精液质量的因素及其对策

精液质量是种公犬繁殖力的一个重要指标,精液质量不良是造成种公犬不育的重要原因之一。精液质量不良的种公犬在配种时,常因母犬不能正常受孕而导致母犬配种后返情;而在人工授精时,精液质量不良导致精液不能使用而废弃。如果不能经常地对种公犬精液质量进行全面的检查就用于输精,同样也可能会导致大批母犬出现空胎现象。影响种公犬精液质量的因素较多,为了进一步提高种公犬精液质量,需了解影响种公犬精液质量的主要因素,并采取相应的对策,以提高种公犬的繁殖力。     

如何做好种犬的交配

一般来说，犬的繁殖是在体成熟之后。母犬通常为1．5岁，公犬为2岁。而由于品种的差异，大体型品种的犬成熟较晚，小体型品种的犬成熟较早。无论什么品种的犬，都应防止未成年就过早交配。而超过8岁的公母犬也不宜再使其交配。     

2011浙江（诸暨）犬种展赛各项目获奖名单

藏獒单独展奖项：最佳公犬 奖项：最佳母犬     

犬的繁殖

<正> 1 发情周期野犬只在冬季交配,而家犬四季都能繁殖,但发情的频率趋向于春末和冬初。Englet(1946)认为家犬的繁殖没有显著的季节性或地域性的变异,可能是由于育种者长期培育的结果。     

犬繁殖生物技术概述

繁殖生物技术,亦称人工辅助繁殖技术(Assisted repro- ductioive technique;ART)。人工授精(Artificial insemination;AI)、胚胎移植(Embryo transfer,ET)以及所有围绕配子和胚胎进行的操作技术都属此范畴。本文对犬的繁殖生物技术进行概述,主要集中在胚胎、精液冷冻保存、人工授精(AI)、卵母细胞体外成熟(In vitro maturation;VM)、体外受精(In vitro     

影响犬繁殖的因素

许多因素包括母犬的品种,年龄,健康,繁殖历史,交配类型,环境,以及母犬的营养水平,都影响了繁殖和幼犬的健康和性质的最终结果。这些不同的影响似乎独立的出现,但是之间有共同的关联。在育种计划中,繁育者在某种程度上要对所有这些加以控制。本文综述了影响犬繁殖的因素,这对于饲养和育种管理的有效的咨询辅导是至关重要的。     

Evidence‐Based Medicine in Canine Reproduction: Quality of Current Available Literature

The objective of this study was to evaluate the quality of published literature on reproduction in dogs. A systematic search in online databases revealed 287 papers that met the inclusion criteria. For evaluation a questionnaire comprising 40 criteria regarding materials and methodology, study design, statistics, presentation and information content, applicability and conclusions was developed. In a pre‐test including seven independent scientists the applicability and explanatory power of the questionnaire and its results were validated. Out of 287 publications evaluated, 90 (31.4%) were classified as clinical trials. The remaining 197 publications were case reports or contained information based on personal experience. Not a single meta‐analysis was found. Sixty (66.7%) of the 90 clinical trials included a control group. Randomization was conducted in 23 and blinding in eight articles respectively. In total five articles were determined as randomized, controlled and blinded clinical trials. Information content of the publications was variable concerning details on included animals, type or dosage of used remedies or conducted interventions. For example, in 99.7% of the articles, the exact number of animals was given, but in 79.8%, housing and feeding of the animals were not described. Statistical procedures of clinical trials were determined adequate in 55.6%. However, the data of 67.9% of the articles were evaluated to be not sufficient to draw valid conclusions. This study revealed evidence of deficits in the field of canine reproduction. The demand for more high quality clinical research is obvious. Requisite for the further implementation of the evidence‐based veterinary medicine is an improvement of the quantity and the quality of well‐designed, conducted and reported clinical trials. The practitioner should always assess the quality of information before implementing results into practice to provide best available care for the animals.     

Canine Reproduction: I. Reaction of Animals to Collection of Semen and Insemination Procedures

Two methods of semen collection were attempted on ten untrained dogs of several breeds. Manual manipulation as described proved most reliable for untrained dogs. Electro-ejaculation was attempted unsucessfully with twelve additional dogs.

Two methods of insemination were compared. Equipment found most satisfactory is described and a modification suggested.