Effects of moving acclimation cages before release of cultured fish: alternate release strategies for a juvenile winter flounder Pseudopleuronectes americanus stock enhancement effort     

Elizabeth A Fairchild  James A Sulikowski  Nathan Rennels  W Huntting Howell  Paul C W Tsang 《Aquaculture Research》2010,41(4):602-606

  相似文献   

Endogenous Progesterone Concentrations Affect Progesterone Release from Intravaginal Devices Used for Oestrous Synchronization in Cattle          下载免费PDF全文

HL Neri  MP Palhao  DS Costa  JHM Viana  CAC Fernandes 《Reproduction in domestic animals》2015,50(4):692-695

Intravaginal progesterone‐releasing devices are largely used both as contraceptives in humans and as a component of oestrous synchronization protocols in cattle. To reduce costs in large‐scale timed artificial insemination, the reuse of these releasing devices is common. Passive hormone diffusion, however, depends on the concentration gradient, which could affect the amount of residual progesterone present in these devices after a first use. To evaluate the effect of the presence of a corpus luteum in the release of progesterone from intravaginal devices, three synchronization protocols were designed to simulate the effects of inserting the device in the early dioestrus, late dioestrus or anoestrus. Holstein‐Zebu cross‐bred heifers were randomly allocated into one of these three treatments, and a series of blood samples was taken to evaluate the plasma progesterone concentrations. After 8 days, the intravaginal devices were removed and underwent a previously validated alcoholic extraction technique to measure the residual progesterone. Non‐used devices were used as controls. As expected, the simultaneous presence of the intravaginal device and a corpus luteum resulted in increased plasma progesterone concentrations. Conversely, the amount of residual progesterone in the devices after use was inversely proportional to the plasma progesterone concentration. These results demonstrate that the release rate of progesterone from intravaginal devices is affected by the endogenous concentration of this hormone; consequently, the strategy for reuse should account for the category and expected luteal cyclic activity of the animals undergoing synchronization protocols.  相似文献   

POST-GLACIAL CONTINENTAL UPLIFT     

Fairchild HL 《Science (New York, N.Y.)》1918,47(1225):615-617

  相似文献   

PLEISTOCENE FEATURES OF SOUTHERN NEW ENGLAND     

Fairchild HL 《Science (New York, N.Y.)》1926,63(1627):260-262

  相似文献   

WHITE INDIANS OF DARIEN     

Fairchild HL 《Science (New York, N.Y.)》1924,60(1550):235-237

  相似文献   

RIVER DEFLECTION: A CORRECTION     

Fairchild HL 《Science (New York, N.Y.)》1932,76(1983):625

  相似文献   

GARDEN FOR THE PROPAGATION OF TROPICAL AND SUBTROPICAL PLANTS     

Fairchild D 《Science (New York, N.Y.)》1923,57(1467):166-168

  相似文献   

Presence of inoculated Campylobacter and Salmonella in unabsorbed yolks of male breeders raised as broilers     

Cox NA  Richardson LJ  Buhr RJ  Northcutt JK  Fairchild BD  Mauldin JM 《Avian diseases》2006,50(3):430-433

Day-old male broiler breeder chicks were obtained from a commercial hatchery and raised as broilers. For Experiment 1, at 5 wk of age, the broilers were orally inoculated with a 10(6) cfu/ml of a characterized strain of Campylobacter jejuni and a cocktail (three naladixic acid-resistant strains) of Salmonella serovars. One week after inoculation, the birds were euthanatized and defeathered. The abdominal cavity was examined and any unabsorbed yolk material (and remaining yolk stalk) and ceca were aseptically removed for microbiological analyses. For each pooled sample (two birds per pool), an aerobic plate count (APC), an Enterobacteriaceae (ENT) count, and a test for the presence of Campylobacter and Salmonella was performed. For Experiment 2, at 5 wk of age, the broilers were orally inoculated with 10(5) cfu/ml of a characterized strain of Campylobacter jejuni. One week after inoculation, the birds (n = 20) were killed, defeathered, and the yolk stalk, attached yolk, or free-floating yolk and ceca were individually analyzed for presence of Campylobacter. For Experiment 1, the Salmonella-inoculated birds had 2/12 ceca and 0/12 unabsorbed yolk samples positive for Salmonella. The average yolk APC was log10 3.4 cfu/g and the average ENT was log10 1.9 cfu/g. For the Campylobacter-inoculated birds, 12/12 ceca and 9/12 unabsorbed yolk samples were positive for Campylobacter. The average yolk APC was log10 3.5 cfu/g and the average ENT was log10 3.1 cfu/g. For Experiment 2, the inoculated Campylobacter birds had 19/20 ceca, 5/20 free floating yolks, and 19/20 yolk stalks positive. In Experiment 1, the inoculated Campylobacter colonized the ceca in every instance and were present in 75% of the unabsorbed yolks. Alternatively, the inoculated Salmonella were not found in any of the unabsorbed yolks and only rarely in the ceca. In Experiment 2, the inoculated Campylobacter was found in very high numbers in the yolk and internal body samples. Determining to what extent these internal bodies and unabsorbed yolks play in bacterial colonization and contamination of the birds at processing has not been determined. The next step will be to determine the incidence of unabsorbed yolks and presence of Campylobacter and Salmonella in these bodies of commercial broilers at processing.  相似文献   

PLEISTOCENE GEOLOGY OF NEW YORK STATE. I     

Fairchild HL 《Science (New York, N.Y.)》1913,37(946):237-249

  相似文献   

OUR WORLD IN THE MAKING     

Fairchild HL 《Science (New York, N.Y.)》1926,64(1659):365-371

  相似文献