The Management of Prostaglandin-controlled Breeding Programs in Beef Cattle - A Five Year Study          下载免费PDF全文

Wenkoff M  Crowe-Swords PR 《The Canadian veterinary journal. La revue veterinaire canadienne》1983,24(2):50-53

A herd of 180 beef cows was synchronized with prostaglandin and bred by artifical insemination for five successive years. Factors influencing the success or failure of estrus synchronizing programs were identified, including the management of nutrition, postpartum interval, cow age and artificial insemination technology. Specific recommendations on the management of prostaglandin-controlled breeding programs resulted in improving the pregnancy rates from 33% in year 1 to 67% in year 5. Improved management and close veterinary supervision were shown to improve the success of an estrus synchronization program.  相似文献   

Year end tax planning   总被引：1，自引：1，他引：0       下载免费PDF全文

Joseph M  Watson R 《The Canadian veterinary journal. La revue veterinaire canadienne》1983,24(11):366-367

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Failure of orally administered zinc to prevent experimentally induced footrot in sheep     

Skerman TM  Millar KR  Sheppard AD  Herceg M  Hughes JM 《New Zealand veterinary journal》1983,31(4):54-57

Two groups of adult Merino sheep, initially grazed on pasture, were dosed daily with zinc sulphate (1 mg Zn/kg LW) or zinc oxide (15 mg Zn/kg LW) for six and seven weeks, respectively. On the 18th day, both groups were transferred to indoor pens together with unmedicated control sheep, and five days later the feet of all animals were infected artificially with a virulent strain of Bacteroides nodosus. By the fourth week after challenge, 85% or more of the feet challenged had developed advanced footrot, and no significant differences in the incidence and severity of lesions between dosed and un-dosed groups were recorded. Plasma zinc concentrations, monitored throughout the experiment, remained at similar levels in sheep receiving the lower dose rate and in the controls. At the higher dose rate, plasma zinc levels increased till Day 23, but thereafter declined to values comparable to those of undosed animals. At post mortem, no evidence of zinc toxicosis was found, and only the kidneys of sheep receiving the higher dosage showed a significant accumulation of zinc compared with the controls.  相似文献   

Membrana nictitans gland cyst in a dog     

Latimer CA  Wyman M  Szymanski C  Werling K 《Journal of the American Veterinary Medical Association》1983,183(9):1003-5, 965

A cyst involving the gland of the 3rd eyelid was removed from an 8-year-old dog. Clinically the circumscribed mass resembled a pigmented neoplasm. Histologically the cyst was multiloculated, with homogeneous eosinophilic periodic acid-Schiff-positive content. Melanin pigment was present in epithelial cells and cystic lumens. Protective functions of the 3rd eyelid were retained following excisional biopsy.  相似文献   

Ultrasound emission after cycles of water stress in Picea abies     

Borghetti M  Raschi A  Grace J 《Tree physiology》1989,5(2):229-237

The relationships among rate of ultrasound acoustic emission (AE), xylem water potential and transpiration rate were investigated in 5-year-old potted saplings of Picea abies Karst. after cycles of water stress. Water-stressed plants displayed minimum xylem water potentials of -3.9 MPa, near-zero transpiration rates and up to 45 AE counts per minute. After rewatering, water-stressed plants no longer produced AEs. Well-watered control plants produced only a small number of ultrasonic AEs. After three cycles of water stress (lasting 24 days in total), it was estimated that about two-thirds of the functional tracheids were embolized. The concomitant reduction in hydraulic conductance was about 70%.  相似文献   

U.s. Transit subsidy policy: in need of reform     

Wachs M 《Science (New York, N.Y.)》1989,244(4912):1545-1549

Public transit in the United States has depended increasingly on public subsidies since the inception ofthe federal mass transit assistance program in the early 1960s. The subsidies are associated with declining efficiency and labor productivity, as urban transit systems have overcapitalized, simplified fare structures, and extended service into sparse suburban markets. Despite these subsidies, transit has not proved successful in countering the effects on its market of increased automobile ownership and use and of decentralizaton of residences and places of employment.  相似文献   

Uncertain future for chinese students     

Sun M 《Science (New York, N.Y.)》1989,246(4934):1114

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The chip makers call, but no cavalry rides to the rescue     

Sun M 《Science (New York, N.Y.)》1989,246(4935):1240-1241

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Japan Lays Out Welcome Mat for U.S. Scientists: New programs seek to entice researchers to spend time in Japanese labs, but many fellowships go begging     

Sun M 《Science (New York, N.Y.)》1989,243(4898):1546-1547

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A Global Supercomputer Race for High Stakes: Although U.S. companies currently hold a lead in technology and sales, Japanese manufacturers are now producing fast machines and slashing prices     

Sun M 《Science (New York, N.Y.)》1989,243(4894):1004-1006

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