肉种鸡高生产性能和高繁殖力研究

肉鸡生产的主要目标是使鸡的巨大生长潜力最大化,从而可以获得较大的体重和较高的胸部肌肉产量。然而,这两个目标都与其繁殖力成负相关。因此,如何维持和提高肉种鸡的繁殖力已经成为我们必须面临的一项挑战。现在的问题是,肉鸡的繁殖力是否已经达到临界点,并且肉种鸡繁殖力的改变是否是不可逆转的。     

建立以苜蓿干草日粮为基础的高产优质高效奶牛业

奶业是世界上许多国家的重要产业,牛奶产量稳中有升,奶牛存栏稳中有降,奶牛单产水平持续增加,奶牛品种不断优化、饲养条件不断改善、集约化程度不断提高是世界奶业生产的发展方向。 以美国为例,美国奶牛良种化程度高,主要     

高温季节保持猪高繁殖性能几项措施

近年来，随着全球气候变暖，辽宁省大部分地区夏季出现持续高温天气，对一些工厂化猪场猪的繁殖性能带来了很大的影响。笔者对营口市盖州、大石桥、老边几个万头工厂化猪场2000年至2004年夏季（6-8月）猪的繁殖成绩资料进行了调查统计，结果表明，在7、8两月接受交配的母猪中未能分娩的比例比10月至来年5月交配母猪的不分娩率（15％-10％）高出10％。在此期间母猪产后产道感染引起的高烧无乳发病率明显增多。     

杨梅大树优质高效栽培改造技术

通过调整树形结构，加强花果管理、施肥管理和病虫防治等技术，改造放任生长的杨梅大树，不仅使果品品质和产量显著提高，而且平抑了大小年结果现象，采摘速度和安全系数也大大提高。     

A high protein high fibre diet improves weight loss in obese dogs

A newly-formulated, high protein high fibre (HPHF) diet has recently been shown to improve satiety in dogs. The current study examined its performance during weight loss in client-owned dogs with naturally-occurring obesity. Fifteen dogs were fed the HPHF diet, whilst a matched ‘control’ group of 27 dogs, received a high protein medium fibre diet (HPMF), with an equivalent caloric density. Baseline characteristics (signalment, percentage overweight, and body fat percentage) were not significantly different between groups. However, percentage weight loss was greater (median [range] 31.8% [12.0–41.2%] vs. 20.0% [5.9–45.0%], P = 0.016) and mean rate of weight loss faster (median [range] 1.0%/week [0.3–1.6%] vs. 0.7%/week [0.3–1.5%], P = 0.028) on HPHF compared with HPMF. Percentage body fat mass decrease (measured by dual-energy X-ray absorptiometry) was also greater in dogs fed the HPHF diet (median (range] 58% [32–85%) vs. 37% [15–72%), P = 0.002). Thus, a diet formulated to include high levels of both protein and fibre, improves outcome during weight loss in obese dogs.     

蜜蜂优质高产综合配套技术

<正>一、"四化"养蜂法2002年颁布有关生产无公害蜂产品NY5134、5135、5136、5137、5138、5139六项标准,为此提出"四化"养蜂法,即养蜂生产标准化,蜂群管理规范化,饲养强蜂程序化,规模养蜂专业化。     

The attitudes of minority junior high and high school students toward veterinary medicine

There is a documented lack of racial diversity in veterinary medicine. It has been suggested that lack of animal ownership by minorities, cultural and ethnic biases relating to animals, and a lack of role models of color within the veterinary profession are reasons for the lack of racial diversity in veterinary medicine. The purpose of this study was to survey the attitudes of minority junior high and high school students toward veterinary medicine. It was hypothesized that African American and Latino students in New York City (NYC) would have limited experience with veterinary medicine and would not have a favorable attitude toward the profession. In fact, the survey, which was sent to several NYC schools, found that minority students have a positive view of animals and of veterinary medicine. The survey also showed that a deficiency of minority role models for students, a lack of interest in and enjoyment of veterinary medicine on the part of students, a perception on the part of students that veterinary medicine does not provide a satisfying lifestyle, and inadequate student exposure to the profession are key factors in the lack of racial diversity in veterinary medicine.