蛋鸡产蛋后期产蛋率营养调控措施

产蛋率是评价蛋鸡生产性能的重要指标，是衡量蛋鸡养殖企业饲养效率和盈利能力的重要因素之一。老龄化是导致蛋鸡产蛋后期产蛋率下降的主要因素。特别是近年来，商品蛋鸡的产蛋周期大大延长，蛋鸡老龄化程度更高，导致产蛋后期面临的产蛋率下降问题更为严峻。文章对鸡蛋的形成过程及引起蛋鸡产蛋后期产蛋率下降的原因进行了概述，并对提高产蛋后期产蛋率的营养调控措施进行了总结和展望。     

影响蛋鸡产蛋高峰期的因素及对策

蛋鸡产蛋率达８０％－９０％时即进入产蛋高峰期，一般产蛋高峰期可维持４个月左右。若品种优良，饲养科学，可延长蛋鸡的产蛋高峰期，直接提高蛋鸡全年的总产蛋水平。那么，影响蛋鸡产蛋高峰期的因素有哪些呢？１蛋白质水平产蛋高峰期间蛋鸡对蛋白质需要量随产蛋率的上升而增加。可见，饲料中蛋白质的含量，对蛋鸡产蛋率的高低有着直接的影响。因此，应在蛋鸡产蛋率达９０％时，就提前喂给蛋白质含量达１９％的日粮，促使产蛋高峰迅速到来。为延长产蛋高峰期，当产蛋率下降时，日粮中蛋白质水平要推迟一周再降低，以使产蛋率下降的速度慢一…     

激蛋散加减治蛋鸡输卵管炎、肠炎

正激蛋散是一种适用于蛋鸡产蛋期的中药制剂,具有清热解毒、活血化瘀、补肾强体的功效,可维护蛋鸡的卵巢和输卵管健康,用于治疗蛋鸡输卵管炎和产蛋功能低下。蛋鸡输卵管的问题会造成开产后产蛋率上不去,高产后产蛋率下降过快及高产期蛋壳质量差等,而蛋鸡肠炎则可间接影响产蛋率。1激蛋散加减制备激蛋散加减配方如下:虎杖200 g、益母草150 g、茵陈100 g、牡蛎100 g、淫羊藿100 g、女贞     

“复方贯众散”对蛋鸡产蛋率的影响试验

在四川通江县、南江县、平昌县及重庆潼南县等地区鸡场蛋鸡产蛋率调查显示,平均产蛋率只有85％,特别是产蛋18个月以后产蛋鸡的产蛋率只有60％左右。因此,本试验用“复方贯众散”（自组配方）对提高蛋鸡产蛋率进行试验。试验结果表明,产蛋18个月后的经产蛋鸡,试验组此对照组产蛋率提高12．7％。     

高峰期蛋鸡产蛋率下降的原因及防治措施

产蛋率是蛋鸡生产中的重要指标,是蛋鸡经济效益好坏的体现。产蛋率下降分正常性产蛋下降和非正常性产蛋下降,正常性产蛋下降属生理性表现,非正常性产蛋下降又分管理因素、饲料因素、疾病因素及其它因素。在养鸡生产中,当鸡群产蛋率下降后,应及时分析原因,及早做出诊断,并根据诊断结果采取相应的措施。现将引起产蛋率下降原因及预防措施介绍如下：     

商品蛋鸡产蛋下降原因及对策

蛋鸡生产过程中,在正常情况下,蛋鸡开产后5～7周即达到产蛋高峰并维持8个月左右,以后的产蛋率逐渐下降。但在实际生产过程中,蛋鸡场常出现蛋鸡开产、高峰和维持时间等延迟或缩短;产蛋率不稳定,达不到高峰;高峰期或产蛋上升期产蛋突然下降等一系列问题。探究商品蛋鸡产蛋下降原因及对策,对于提高蛋鸡养殖水平、提升养殖效益有着非常重要的意义。     

蛋鸡无产蛋高峰的原因和应对措施

<正>在正常饲养管理条件下,良种蛋鸡产蛋率是有一定规律的。蛋鸡在开始产蛋后,产蛋率会迅速上升,当产蛋率达到50%,也就是鸡群中有一半的蛋鸡开始产蛋之后的3~4周之内,就进入了产蛋高峰期。正常情况下,蛋鸡的产蛋高峰期会持续很长时间,而实际生产中,     

产蛋高峰期蛋鸡产蛋率低的原因与处理

正蛋鸡产蛋高峰期的产蛋量决定着产蛋期的产蛋量,目前开产后的140~200日龄蛋鸡常出现产蛋率上升缓慢,或者产蛋率不稳定,忽高忽低,或者鸡群无产蛋高峰期的现象,严重影响蛋鸡在整个产蛋期的产蛋量和养殖经济效益。随着蛋鸡养殖规模的不断扩大,蛋鸡养殖也开始进入微利时代,因此,对鸡群进行科学的饲养管理,提高蛋鸡的产蛋率。引起蛋鸡产蛋高峰期产蛋率低的因素较多,养殖者需要在养殖过程中掌握这些因素,并采取切实有效的措施。     

引起鸡产蛋率下降的三大因素解析

<正>蛋鸡养殖成功与否关键看产蛋率以及鸡蛋的变化,健康蛋鸡群产蛋率是相对稳定的,蛋的色泽、大小,也是有规律的变化。而在蛋鸡产蛋高峰期,周产蛋率下降的幅度应该在0.5%左右。究竟哪些因素影响产蛋率,笔者认为主要有以下三个方面。     

肇东市蛋鸡产蛋率下降的发病情况及防治措施

1发病情况 2013年3月份以来，我市部分存栏蛋鸡产蛋率普遍下降，与往年同生产期比较，蛋鸡产蛋率下降10％-20％。正常情况下，蛋鸡产蛋高峰期产蛋率为95％-97％，持续3～5个月。而今年蛋鸡产蛋率仅为78％～92％，并且产蛋率在83％～87％的鸡群占多数，鸡只达不到产蛋高峰，产蛋高峰无法持续的情况普遍存在。     

中国饲料工业协会第五届理事会顾问、会长、常务副会长、副会长、秘书长、副秘书长、常务理事、理事名单

顾问刘中一张德邻宋瑞祥聂振邦张子仪戎易王维四会长白美清国务院原副秘书长、第四届理事会会长常务副会长(8人,以姓氏笔划为序)刘永好新希望集团董事长、第四届理事会副会长刘汉元通威股份有限公司董事长、第四届理事会副会长陈丹广东恒兴集团股份有限公司董事长、第四届理事会副会长张延喜农业部原副部长、第四届理事会副会长吴明夏湖南正虹科技发展股份有限公司董事长、第四届理事会副会长陶一山唐人神集团股份有限公司董事长、第四届理事会副会长温鹏程广东温氏食品集团有限公司董事长、第四届理事会副会长谭竹洲原化学工业部副部长、第…     

Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog

Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum.     

The influence of the width of the saddle tree on the forces and the pressure distribution under the saddle

As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks.     

浅谈对症用药

对症用药就是通过对患病信鸽的症状进行诊断,进而确定病属,选择药物及如何用药的方法。     

军犬鉴别中的嗅源培养和易出现的问题及对策

嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.……