John Malcolm Keep     

PJ Mylrea 《Australian veterinary journal》1996,74(6):482-482

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Gonadotrophin secretion in ewes with bilateral gonadal hypoplasia     

PJ WRIGHT  DB GALLOWAY  IJ CLARKE 《Australian veterinary journal》1996,73(4):157-158

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BOOK REVIEW: Parasitic Diseases of Wild Mammals     

PJ Duignan 《Australian veterinary journal》2003,81(1-2):80-80

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The effect of combinations of anthelmintics on parasite populations in sheep     

PJ WALLER  RJ DOBSON  KG HAUGHEY 《Australian veterinary journal》1990,67(4):138-140

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A dose-response investigation on the level of resistance to pyrantel citrate in nodular worms of pigs     

H Bj?rn  A Roepstorff  P Nansen  P J Waller 《Veterinary parasitology》1989,31(3-4):259-267

This study was undertaken to determine the level of resistance against pyrantel citrate in strains of Oesophagostomum quadrispinulatum and Oesophagostomum dentatum which have previously been found resistant to this anthelmintic. Groups of pigs were artificially infected with batches of infective larvae which were previously found either susceptible or resistant to pyrantel citrate. After treatment with 1, 2 and 4 times the recommended dose (14 mg kg-1) of pyrantel citrate, the resistant O. quadrispinulatum population was reduced by 51.0, 76.2 and 86.1%, and O. dentatum by 41.2, 47.9 and 78.5%. The results indicated that O. dentatum was slightly more resistant (P less than 0.05) than O. quadrispinulatum to pyrantel citrate. Treatment of the susceptible worms with 1 and 2 times the recommended dose caused a reduction in worm numbers by 61.0 and 99.4%, respectively.  相似文献   

Deaths in captive eels (Anguila reinhardtii) due to Photobacterium (Vibrio) damsela   总被引：1，自引：0，他引：1  

PJ KETTERER  LE EAVES 《Australian veterinary journal》1992,69(8):203-204

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Aspects of reproduction in female Bos indicus cattle: a review     

PJ CHENOWETH 《Australian veterinary journal》1994,71(12):422-426

SUMMARY Differences occur between female Bos indicus and Bos taurus cattle in various aspects of reproductive physiology and behaviour. These may be associated with different natural and human selection pressures, compounded by strong genotype-environment interactions. B indicus cattle are better adapted for tropical environments (despite overall poor cattle reproductive rates in these regions) which tend to be more stressful for B taurus genotypes. Conversely, B taurus cattle generally show superior reproductive and productive traits under more favoured, temperate conditions. Despite genotype-environment effects, B indicus females are generally considered to take longer to achieve puberty and to have longer gestation lengths, exhibit prolonged postpartum anoestrus, show greater seasonality of reproductive traits (tending to be long-day breeders), display a shorter, less overt oestrus as well as less tendency to allow riding behaviour by subordinate females. Some groups appear to have increased losses both during pregnancy and in the neonatal period. On the positive side, B indicus females respond well to managerial and nutritional interventions, tend to have greater reproductive longevity and they generally exhibit strong maternal traits. Culling of infertile females and selection for greater male scrotal circumference and sex-drive, in conjunction with the use of target weights, body condition scoring and weaning stratagems can improve reproductive rates in B indicus females.  相似文献   

Effect of melatonin on induction of estrous cycles in anestrous ewes     

S L Waller  R E Hudgens  M A Diekman  G E Moss 《Journal of animal science》1988,66(2):459-463

To examine the influence of melatonin on seasonality of reproduction, 97 multiparous Suffolk and Suffolk-cross ewes were randomly assigned to one of four treatment (TRT) groups in a 2 X 2 factorial arrangement. Treatments were as follows: 1) control (C); 2) melatonin (M); 3) progestogen (P) implant of norgestomet plus pregnant mare serum gonadotropin (PMSG) injection (P + PMSG) and 4) M plus TRT 3 (M + P + PMSG). From April 3 to June 24 an oral dose of 2 mg M was administered once daily at 1600 to each ewe in TRT groups M and M + P + PMSG. On April 30, ewes in groups P + PMSG and M + P + PMSG were implanted in the ear with 2 mg norgestomet for 13 d. Immediately following implant removal, each ewe was injected with 500 IU PMSG. Blood samples were collected from all ewes twice weekly from March 22 through June 24. Number of estrous cycles per ewe during the TRT period of 82 d (April 3 to June 24) was higher (P less than .05) for M + P + PMSG (2.1 +/- .2) than for C (.3 +/- .2), M (1.5 +/- .2) and P + PMSG (1.1 +/- .2). Control ewes had fewer (P less than .05) estrous cycles per ewe than either M or P + PMSG. Following the induced estrus, 40% of ewes in the M TRT had one estrous cycle; 32% had two or more cycles. For ewes treated with M + P + PMSG, 24% had one cycle, and 32% had two estrous cycles.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

An attempt to prevent acute toxoplasmosis in macropods by vaccination with Hammondia hammondi     

GL REDDACLIFF  SJ PARKER  JP DUBEY  PJ NICHOLLS  AM JOHNSON  DW COOPER 《Australian veterinary journal》1993,70(1):33-35

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In-vitro activity of ceftiofur against Australian isolates of the family Pasteurellaceae associated with respiratory disease in cattle and pigs     

PJ BLACKALL  JL PAHOFF  CP STEPHENS  FM DARVILL 《Australian veterinary journal》1996,74(1):71-71

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