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孙贤 《江西畜牧兽医杂志》2003,(4):15-16
1母猪的发情鉴定1.1发情周期特点母猪的发情周期为21d(17~25d),发情周期长短,在不同年龄和不同品种差异不大。正常情况下,无明显发情季节,但在严寒和酷暑季节,或饲养管理不良时,会暂时出现不发情或发情延迟。产后第1次出现发情时间与哺乳有关。一般在哺乳期间不发情,通常在断奶后4~7d发情。但也有少数母猪会在产后3~6d出现第1次发情,但持续期比断乳后发情约短2/3,多因不排卵而不能受孕,且其发情不易发现。如果在哺乳期间任何时候停止哺乳仔猪,则在4~10d后便可发情。后备母猪持续期为1~2d,经产母猪2~3d;断奶后第1次发情持续期比以后出… 相似文献
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新荣昌猪Ⅰ系是导入 2 5 %丹系长白猪血液后经闭锁选育而成的瘦肉型猪专门化品系 ,其母猪发情征兆比本地母猪发情征兆稍弱 ,而且发情持续期介于外种猪与本地猪之间 ,所以应在仔细观察掌握母猪的发情征兆基础上 ,综合判断适时配种时间 ,采取适当的配种方式进行配种 ,以提高其情期受胎率。一、母猪的发情征兆1 精神状态 :发情初期 ,母猪兴奋不安 ,在圈内来回走动 ,东张西望 ,食欲有所下降 ;进入发情盛期后 ,母猪常在圈门口张望 ,爬圈 ,爬跨同圈母猪或接受爬跨 ,喜接近人 ,压背呆立不动 ,频频排尿。2 阴户变化规律 :发情初期 ,阴户稍肿胀 ,色… 相似文献
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一、母猪的性成熟与配种年龄:瘦肉型猪大多性成熟较晚,一般要到5~7月龄才能达到初情期(性成熟),性成熟后的母猪虽能配种受孕,但其产仔较少,因此,适宜的配种年龄应为:8~9月龄以上、发情2~3次以后、体重110~120公斤以上时开始配种。二、母猪的发情表现:母猪性成熟后,会出现周期性发情,发情周期为19~24天,平均21天,发情持续时间3~5天。按母猪发情症状分为前、中、后三期。1发情前期:阴户开始潮红肿胀,但分泌物少且透明稍带白色,精神不安,食欲减退,在栏内不时走动,有时爬跨栏内其他母猪,但拒绝公猪配种,用手压背要逃跑。2发情中期:发情高… 相似文献
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1.母猪以18~23天的间隔相当规律地发情。从这次发情开始到下一次发情期开始的间隔通常为21天,被称为发情周期。发情周期分为几个非常明显的阶段,称为发情前期,发情期,发情后期。经产母猪断奶3~7天发情,了解母猪发情各阶段的情况,把握住最佳配种时间是提高怀孕率和母猪的窝产数的关键。 2.母猪的发情表现及持续时间(见表1)。 3.母猪卵子释放后6小时开始老化,而公猪精子在母猪生殖道中存活大约24小时,配种必须在恰当的时间进行以保持最大数目的卵子受精,如果配种早或晚,结果都不理想。 4.获得最佳效果的做法是:在 表1 母猪发情表现及… 相似文献
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1发情与排卵母猪的发情周期是母猪从上次发情开始到下次发情开始的时间,分为发情前期、发展中期、发情后期、休情期,一般16~25天,发情持续期为2~3天。母猪产后通常在3~6天之内发情,不排卵。排卵期是从发情开始后24~48小时,高峰时期为36小时,排卵持续时间为10~15小时,卵子到达输卵管腹部的时间为6~12小时,能保持8~10小时的生命活力。 相似文献
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1母猪的发情鉴定
1.1初情期
母猪一般在5~8月龄出现初情期,平均为7月龄,发情周期为20~22 d,平均21 d。母猪达到初情期时已经初步具备了繁殖力,但由于下丘脑-垂体-性腺轴的反馈系统不够稳定,表现为初情期后的几个发情周期往往时间变化较大, 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引:1,自引:0,他引:1
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. 相似文献
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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.…… 相似文献
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Meschan EM Peham C Schobesberger H Licka TF 《Veterinary journal (London, England : 1997)》2007,173(3):578-584
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. 相似文献
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Observations on the Pathology of the Spleen of the Cat 总被引:1,自引:0,他引:1
Abstract— Lesions were found in the spleen of four of sixty-three cats examined post mortem in the department, and comprised two examples of lymphosarcoma, one of chronic fibrinous peritonitis and one of subcapsular haematoma. Abnormalities were found in two cat spleens received from veterinary surgeons in general practice. In one cat the abnormalities were an haemangiosarcoma with secondary deposits in the liver and in the other extensive mast cell infiltration. In addition lesions were detected in the spleen of three of eighty-seven cats examined post mortem in general practice. The lesions were: multiple secondary deposits of adenocarcinoma from a primary tumour of the mammary gland, a ruptured spleen and a foreign body below the splenic capsule. Résumé— L'examen microscopique de soixante-trois chats pratiqué dans le service a permis de rencontrer quatre fois des lésions de la rate, dont deux lymphosarcomes, une péritonite capsulaire fibrineuse et un hématome sous-capsulaire. D'autre part des lésions ont été trouvées dans deux rates de chat expédiées par des vétérinaires exerçant en pratiaue générale. Chez un chat il s'agissait d'un htmangiosarcome avec métastases hépatiques et chex l'autre d'une infilt ation diffuse par des mastocyta. De plus, on a rencontré des llésions dnas la rate de trois chats parmi quatre-vingt sept autopsies effectuées dans le cadre d'une clientèle génárale. Ces iésions étaient dés métastases multiples d'un adénocarcinome dont la tumeur primitive siègeait dam la glande mammaire, une rupture de la rate et un corps érangers sou capsulaire. Zusammenfassung— Läsionen der Milz wurden bei vier von dreiuiidsechzig in dieser hbteilung sezierten Katzen gefunden, und zwar in zwei Fällen ein Lymphosarkom, in einem Falle eine chron-ische fibrinöse Peritonitis und in einem ein subkapsuläres Hématom. Anomalien fanden sich auch in der Milz von zwei Katzen, die aus der tierxrztlichen Praxis eingesandt wurden. Bei der einen Katze war dies ein Hämangiosarkom mit Metastasen in der Leber, bei der anderen eine weitläufige Infiltration der Mastzellen. Außerdem wurden bei drei von siebenundachtzig in der Praxis sezierten Katzen Milzläsionen gefunden. Diese bestanden am multiplen Metastasen eines Adenokarzinoms der Brustdrüse, einer Milzzerreissung und einem Fremdkörper unterhalb der Milzkapsel. 相似文献