Aspects of the management of cheetahs, Acinonyx jubatus jubatus, trapped on Namibian farmlands     

L.L Marker  A.J Dickman  M.G.L Mills 《Biological conservation》2003,114(3):401-412

The Namibian cheetah population has recently undergone serious decline due to human-mediated removals, and investigating the rates and causes of such removals is an important aspect of the future management of cheetah populations outside protected areas. We examined cheetahs that were reported live-trapped or killed on Namibian farmlands between 1991 and 1999. A perceived threat to livestock or game led to the vast majority of live captures and to almost half of the cheetah deaths investigated. Despite this, livestock predation from cheetahs appeared to be minimal, and was usually perpetrated by cheetahs with injuries. Most of the cheetahs were trapped in groups, and cheetahs’ relative sociality leads to the easy removal of entire social units. Long-term monitoring must include detailed consideration of these indiscriminate removals, as they involve many cheetahs, fluctuate between years, often go unreported, and are likely to have a serious impact on cheetah populations outside protected areas.  相似文献   

Species compositional similarity and ecoregions: Do ecoregion boundaries represent zones of high species turnover?     

Robert McDonald  Meghan McKnight  Elizabeth Selig  Christy Violin 《Biological conservation》2005,126(1):24-40

The concept of an ecoregion, a discrete spatial area where species composition is presumed to be relatively homogeneous compared to that between areas, has become an increasingly common conservation tool. We test the effectiveness of one ecoregion delineation (World Wildlife Fund) in capturing patterns of change in species composition of birds, mammals, and trees across the United States (excluding Hawaii) and Canada, and describe the extent to which each ecoregion boundary is concurrent with relatively large changes in species composition. Digitized range maps were used to record presence/absence in 50 × 50 km equal-area grid cells covering the study area. Jaccard’s index of similarity was calculated for all pairs of cells in the same or adjacent ecoregions. The average rate at which similarity declined with geographic distance was calculated using pairs of cells within the same ecoregion (intra-ecoregion turnover) or using pairs of cells in adjacent ecoregions (inter-ecoregion turnover). The intra-ecoregion rate varies widely among ecoregions and between taxa, with trees having a faster rate of similarity decline than mammals or birds. For all three species groups, most ecoregion boundaries have similar rates across them (inter-ecoregion) than that within each adjacent ecoregion (intra-ecoregion), with the exception of zones of transition between biomes and major geographical features. Although the ecoregion concept is useful for many other conservation applications, the lack of systematic, high turnover rates along ecoregion boundaries suggests that ecoregions should not be used as a quantitative basis for delineating geographic areas of a particular taxonomic group.  相似文献   

Year book of agricultural co-operation, 1980: by The Plunkett Foundation. 1981. vi + 277 pp. Price: £7·00 (Paperback)     

F.D. Mills 《Agricultural Systems》1982,8(4):314-315

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Incidence of bovine mucosal disease in Connecticut   总被引：1，自引：0，他引：1  

J H Mills  R E Luginbuhl 《The Cornell veterinarian》1965,55(4):583-590

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A disease resembling malignant catarrhal fever in captive white-tailed deer in Saskatchewan.          下载免费PDF全文

G Wobeser  J A Majka    J H Mills 《The Canadian veterinary journal. La revue veterinaire canadienne》1973,14(5):106-109

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Effect of suppression of prolactin secretion on adipose lipogenesis in the postpartum beef cow     

S E Mills  R P Lemenager  L A Horstman 《Journal of animal science》1989,67(11):2904-2912

Effects of inhibiting prolactin secretion and of calf removal at 3 d postpartum on the lipogenic capacity of s.c. adipose tissue were investigated in postpartum beef cows. The rate of fatty acid synthesis (SYN) from [1-14C]acetate and the activity of fatty acid synthetase (FAS) were assessed on adipose tissue obtained by biopsy at 1, 2, 4, 8 and 10 wk postpartum. Administration of bromocriptine (BR; a drug that suppresses prolactin secretion in rats) between d 7 and 42 postpartum decreased average serum prolactin concentrations nearly 90%, but BR had no effect on lipogenic rates at any week compared to control (CO) cows. Rates of SYN (nmol acetate.min-1.g-1 tissue) increased linearly in CO and BR cows from a nadir of 3.1 at wk 1 to 19.3 by wk 8. Within CO and BR, cows with the greater energy intake relative to requirements for lactation (energy balance) had the faster rates of recovery of SYN. Cows whose calves were weaned early (3 d) showed rapid early increases in SYN, reaching an average maximum rate of 46.2 by wk 2. Activity of FAS generally followed a pattern similar to that of SYN for all groups. Results indicate that prolactin is not responsible for low rates of postpartum lipogenesis in s.c. adipose tissue and that energy intake influences the rate of recovery.  相似文献   

Reduction of radiocaesium absorption by sheep consuming feed contaminated with fallout from Chernobyl     

M Phillippo  S Gvozdanovic  D Gvozdanovic  J K Chesters  E Paterson  C F Mills 《The Veterinary record》1988,122(23):560-563

Two compounds, a zeolite, clinoptilolite, and a ferrocyanide, potassium hexacyanocobalt (II) ferrate (II), were found to be the most effective adsorbers of caesium in vitro. When used in vivo they significantly reduced the absorption of caesium by sheep fed contaminated herbage. These compounds did not alter the rate of excretion of pre-absorbed caesium, which varied with the time from cessation of contamination.  相似文献   

STILBOESTROL TOXICITY IN A DOG     

J. N. Mills  D. H. Slatter 《Australian veterinary journal》1981,57(1):39-42

A case of stilboestrol toxicity is described in a dog which was treated for prostatic hyperplasia with stilboestrol dipropionate (10 mg) daily for 5 days. An initial anaemia and thrombocytopaenia of 19,500/microliters was recorded on day 11, and a severe leukocytosis of 125,300/microliters on day 15 was followed by a precipitous drop to 8,400/microliters on day 21. The dog received antibiotic treatment for concurrent peritonitis and prostatitis/cystitis between days 7 and 15. The dog died on day 41 with marrow aplasia.  相似文献   

Gonadotropin levels for multiple births in beef cattle     

C K Vincent  A C Mills 《Journal of animal science》1972,34(1):77-81

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Epitheliogenesis imperfecta in Holstein-Friesian calves.   总被引：1，自引：1，他引：0       下载免费PDF全文

H W Leipold  J H Mills    K Huston 《The Canadian veterinary journal. La revue veterinaire canadienne》1973,14(5):114-118

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